From 483aaf19f277596ae073571061d4e0048c2463e0 Mon Sep 17 00:00:00 2001
From: Tiit Hansen <tiit.hansen@easypark.net>
Date: Sun, 7 May 2023 14:34:21 +0300
Subject: [PATCH] Improve tracing

1) Add possibility to use HTTP OTLP exporter.
2) Improve tracing so that module creates internal or client span depending if the request is handled by nginx directly or passed upstream.
3) Set span status depending on result. If status code is between 400 - 599 set status as error.
4) Catch internal processing failures in log phase.
5) Rewrite tests in JS
---
 .github/workflows/nginx.yml                   |   16 +-
 instrumentation/nginx/CMakeLists.txt          |    3 +
 instrumentation/nginx/src/agent_config.cpp    |   32 +-
 instrumentation/nginx/src/agent_config.h      |    2 +
 instrumentation/nginx/src/otel_ngx_module.cpp |  161 +-
 .../nginx/src/post_batch_span_processor.cpp   |    8 +
 .../nginx/src/post_batch_span_processor.h     |   27 +
 .../nginx/src/post_span_processor.cpp         |    8 +
 .../nginx/src/post_span_processor.h           |   26 +
 instrumentation/nginx/src/proxy_recordable.h  |   83 +
 instrumentation/nginx/src/trace_context.h     |    4 +
 instrumentation/nginx/test/conf/nginx.conf    |    3 +-
 instrumentation/nginx/test/data/trace.json    |    2 -
 .../lib/mix/tasks/dockerfiles.ex              |    2 +-
 .../test/instrumentation/package-lock.json    | 1944 +++++++++++++++++
 .../nginx/test/instrumentation/package.json   |   14 +
 .../nginx/test/instrumentation/test.js        |  782 +++++++
 17 files changed, 3063 insertions(+), 54 deletions(-)
 create mode 100644 instrumentation/nginx/src/post_batch_span_processor.cpp
 create mode 100644 instrumentation/nginx/src/post_batch_span_processor.h
 create mode 100644 instrumentation/nginx/src/post_span_processor.cpp
 create mode 100644 instrumentation/nginx/src/post_span_processor.h
 create mode 100644 instrumentation/nginx/src/proxy_recordable.h
 create mode 100644 instrumentation/nginx/test/instrumentation/package-lock.json
 create mode 100644 instrumentation/nginx/test/instrumentation/package.json
 create mode 100644 instrumentation/nginx/test/instrumentation/test.js

diff --git a/.github/workflows/nginx.yml b/.github/workflows/nginx.yml
index 130fdd3e6..87e984566 100644
--- a/.github/workflows/nginx.yml
+++ b/.github/workflows/nginx.yml
@@ -70,10 +70,22 @@ jobs:
           rm -rf /tmp/buildx-cache/nginx
           mv /tmp/buildx-cache/express-new /tmp/buildx-cache/express
           mv /tmp/buildx-cache/nginx-new /tmp/buildx-cache/nginx
-      - name: run tests
+      #- name: run tests
+      #  run: |
+      #    cd instrumentation/nginx/test/instrumentation
+      #    mix test
+      - name: Setup node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '18'
+      - name: Install dependencies
+        run: |
+          cd instrumentation/nginx/test/instrumentation
+          npm install
+      - name: Run tests
         run: |
           cd instrumentation/nginx/test/instrumentation
-          mix test
+          npm run test
       - name: copy artifacts
         id: artifacts
         run: |
diff --git a/instrumentation/nginx/CMakeLists.txt b/instrumentation/nginx/CMakeLists.txt
index 82924354a..ef2c65a47 100644
--- a/instrumentation/nginx/CMakeLists.txt
+++ b/instrumentation/nginx/CMakeLists.txt
@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.12)
 
 project(opentelemetry-nginx)
 
+find_package(nlohmann_json REQUIRED)
 find_package(opentelemetry-cpp REQUIRED)
 find_package(Threads REQUIRED)
 find_package(Protobuf REQUIRED)
@@ -19,6 +20,8 @@ add_library(otel_ngx_module SHARED
   src/otel_ngx_module_modules.c
   src/propagate.cpp
   src/script.cpp
+  src/post_batch_span_processor.cpp
+  src/post_span_processor.cpp
 )
 
 target_compile_options(otel_ngx_module
diff --git a/instrumentation/nginx/src/agent_config.cpp b/instrumentation/nginx/src/agent_config.cpp
index 2921c2a4d..0d23e9ed8 100644
--- a/instrumentation/nginx/src/agent_config.cpp
+++ b/instrumentation/nginx/src/agent_config.cpp
@@ -2,6 +2,7 @@
 #include "toml.h"
 #include <algorithm>
 #include <stdlib.h>
+#include <opentelemetry/ext/http/common/url_parser.h>
 
 struct ScopedTable {
   ScopedTable(toml_table_t* table) : table(table) {}
@@ -34,13 +35,38 @@ static bool SetupOtlpExporter(toml_table_t* table, ngx_log_t* log, OtelNgxAgentC
   }
 
   std::string host = FromStringDatum(hostVal);
+  opentelemetry::ext::http::common::UrlParser urlParser(host);
 
-  if (!portVal.ok) {
-    ngx_log_error(NGX_LOG_ERR, log, 0, "Missing required port field for OTLP exporter");
+  if (!urlParser.success_) {
+    ngx_log_error(NGX_LOG_ERR, log, 0, "Invalid host field for OTLP exporter");
     return false;
   }
 
-  config->exporter.endpoint = host + ":" + std::to_string(portVal.u.i);;
+  if (portVal.ok) {
+    urlParser.port_ = portVal.u.i;
+  }
+
+  config->exporter.endpoint =
+          urlParser.scheme_ + "://" +
+          urlParser.host_ + ":" +
+          std::to_string(urlParser.port_) +
+          urlParser.path_ +
+          urlParser.query_;
+
+  ngx_log_error(NGX_LOG_INFO, log, 0, "Using host: %s", config->exporter.endpoint.c_str());
+
+  const toml_datum_t protocolVal = toml_string_in(table, "protocol");
+
+  if (protocolVal.ok) {
+      std::string protocolStringVal = FromStringDatum(protocolVal);
+      if (protocolStringVal == "grpc") {
+          config->exporter.protocol = gRPC;
+      } else if (protocolStringVal == "http") {
+          config->exporter.protocol = HTTP;
+      } else {
+          config->exporter.protocol = gRPC;
+      }
+  }
 
   toml_datum_t useSSLVal = toml_bool_in(table, "use_ssl");
   if (useSSLVal.ok) {
diff --git a/instrumentation/nginx/src/agent_config.h b/instrumentation/nginx/src/agent_config.h
index 1f447ddb4..2ad0548b5 100644
--- a/instrumentation/nginx/src/agent_config.h
+++ b/instrumentation/nginx/src/agent_config.h
@@ -7,12 +7,14 @@ extern "C" {
 }
 
 enum OtelExporterType { OtelExporterOTLP, OtelExporterJaeger };
+enum OtelExporterProtocol { gRPC, HTTP };
 enum OtelProcessorType { OtelProcessorSimple, OtelProcessorBatch };
 enum OtelSamplerType { OtelSamplerAlwaysOn, OtelSamplerAlwaysOff, OtelSamplerTraceIdRatioBased };
 
 struct OtelNgxAgentConfig {
   struct {
     OtelExporterType type = OtelExporterOTLP;
+    OtelExporterProtocol protocol = gRPC;
     std::string endpoint;
     bool use_ssl_credentials = false;
     std::string ssl_credentials_cacert_path = "";
diff --git a/instrumentation/nginx/src/otel_ngx_module.cpp b/instrumentation/nginx/src/otel_ngx_module.cpp
index b94b9725e..b2e40b60a 100644
--- a/instrumentation/nginx/src/otel_ngx_module.cpp
+++ b/instrumentation/nginx/src/otel_ngx_module.cpp
@@ -3,6 +3,7 @@
 // avoid conflict between Abseil library and OpenTelemetry C++ absl::variant.
 // https://github.com/open-telemetry/opentelemetry-cpp/tree/main/examples/otlp#additional-notes-regarding-abseil-library
 #include <opentelemetry/exporters/otlp/otlp_grpc_exporter.h>
+#include <opentelemetry/exporters/otlp/otlp_http_exporter.h>
 // clang-format on
 
 #include <opentelemetry/sdk/trace/processor.h>
@@ -24,6 +25,8 @@ extern ngx_module_t otel_ngx_module;
 #include "nginx_config.h"
 #include "nginx_utils.h"
 #include "propagate.h"
+#include "post_span_processor.h"
+#include "post_batch_span_processor.h"
 #include <opentelemetry/context/context.h>
 #include <opentelemetry/nostd/shared_ptr.h>
 #include <opentelemetry/sdk/trace/batch_span_processor.h>
@@ -37,6 +40,7 @@ extern ngx_module_t otel_ngx_module;
 #include <opentelemetry/trace/provider.h>
 
 namespace trace = opentelemetry::trace;
+namespace common = opentelemetry::common;
 namespace nostd = opentelemetry::nostd;
 namespace sdktrace = opentelemetry::sdk::trace;
 namespace otlp = opentelemetry::exporter::otlp;
@@ -133,6 +137,8 @@ static ngx_int_t OtelGetContextVar(ngx_http_request_t*, ngx_http_variable_value_
   return NGX_OK;
 }
 
+
+
 static ngx_int_t
 OtelGetTraceContextVar(ngx_http_request_t* req, ngx_http_variable_value_t* v, uintptr_t data);
 
@@ -437,21 +443,13 @@ TraceContext* CreateTraceContext(ngx_http_request_t* req, ngx_http_variable_valu
   return context;
 }
 
-ngx_int_t StartNgxSpan(ngx_http_request_t* req) {
-  if (!IsOtelEnabled(req)) {
-    return NGX_DECLINED;
-  }
-
-  // Internal requests must be called from another location in nginx, that should already have a trace. Without this check, a call would generate an extra (unrelated) span without much information
-  if (req->internal) {
-    return NGX_DECLINED;
-  }
+TraceContext* StartNgxTrace(ngx_http_request_t* req) {
 
   ngx_http_variable_value_t* val = ngx_http_get_indexed_variable(req, otel_ngx_variables[0].index);
 
   if (!val) {
     ngx_log_error(NGX_LOG_ERR, req->connection->log, 0, "Unable to find OpenTelemetry context");
-    return NGX_DECLINED;
+    return nullptr;
   }
 
   TraceContext* context = CreateTraceContext(req, val);
@@ -465,30 +463,43 @@ ngx_int_t StartNgxSpan(ngx_http_request_t* req) {
     incomingContext = ExtractContext(&carrier);
   }
 
-  trace::StartSpanOptions startOpts;
-  startOpts.kind = trace::SpanKind::kServer;
-  startOpts.parent = GetCurrentSpan(incomingContext);
+  const auto operationName = GetOperationName(req);
+
+  std::initializer_list<std::pair<nostd::string_view, common::AttributeValue>> commonAttributes = {
+          {"http.method", FromNgxString(req->method_name)},
+          {"http.flavor", NgxHttpFlavor(req)},
+          {"http.target", FromNgxString(req->unparsed_uri)},
+          // Add http.route as its according to OpenTelemetry spec
+          {"http.route", FromNgxString(req->unparsed_uri)}
+  };
+
+  trace::StartSpanOptions requestStartOpts;
+  requestStartOpts.parent = GetCurrentSpan(incomingContext);
+  requestStartOpts.kind = trace::SpanKind::kServer;
+  context->request_span = GetTracer()->StartSpan(operationName,commonAttributes, requestStartOpts);
 
-  context->request_span = GetTracer()->StartSpan(
-    GetOperationName(req),
-    {
-      {"http.method", FromNgxString(req->method_name)},
-      {"http.flavor", NgxHttpFlavor(req)},
-      {"http.target", FromNgxString(req->unparsed_uri)},
-    },
-    startOpts);
+  trace::StartSpanOptions innerSpanOpts;
+  innerSpanOpts.parent = context->request_span->GetContext();
+  innerSpanOpts.kind = trace::SpanKind::kInternal;
+
+  context->inner_span = GetTracer()->StartSpan(operationName,commonAttributes,innerSpanOpts);
 
   nostd::string_view serverName = GetNgxServerName(req);
   if (!serverName.empty()) {
     context->request_span->SetAttribute("http.server_name", serverName);
+    context->inner_span->SetAttribute("http.server_name", serverName);
   }
 
   if (req->headers_in.host) {
-    context->request_span->SetAttribute("http.host", FromNgxString(req->headers_in.host->value));
+    const auto host = FromNgxString(req->headers_in.host->value);
+    context->request_span->SetAttribute("http.host", host);
+    context->inner_span->SetAttribute("http.host", host);
   }
 
   if (req->headers_in.user_agent) {
-    context->request_span->SetAttribute("http.user_agent", FromNgxString(req->headers_in.user_agent->value));
+    const auto userAgent = FromNgxString(req->headers_in.user_agent->value);
+    context->request_span->SetAttribute("http.user_agent", userAgent);
+    context->inner_span->SetAttribute("http.user_agent", userAgent);
   }
 
   if (locConf->captureHeaders) {
@@ -500,10 +511,24 @@ ngx_int_t StartNgxSpan(ngx_http_request_t* req) {
                        {excludedHeaders, 2});
   }
 
-  auto outgoingContext = incomingContext.SetValue(trace::kSpanKey, context->request_span);
+  auto outgoingContext = incomingContext.SetValue(trace::kSpanKey, context->inner_span);
 
   InjectContext(&carrier, outgoingContext);
 
+  return context;
+}
+
+ngx_int_t StartNgxSpan(ngx_http_request_t* req) {
+  if (!IsOtelEnabled(req)) {
+    return NGX_DECLINED;
+  }
+
+  if (req->internal) {
+    return NGX_DECLINED;
+  }
+
+  StartNgxTrace(req);
+
   return NGX_DECLINED;
 }
 
@@ -532,23 +557,13 @@ void AddScriptAttributes(
   }
 }
 
-ngx_int_t FinishNgxSpan(ngx_http_request_t* req) {
-  if (!IsOtelEnabled(req)) {
-    return NGX_DECLINED;
-  }
-
-  TraceContext* context = GetTraceContext(req);
-
-  if (!context) {
-    return NGX_DECLINED;
-  }
+void UpdateSpan(nostd::shared_ptr<opentelemetry::trace::Span> span, ngx_http_request_t* req, bool captureHeaders = false) {
 
-  auto span = context->request_span;
   span->SetAttribute("http.status_code", req->headers_out.status);
 
-  OtelNgxLocationConf* locConf = GetOtelLocationConf(req);
+  OtelNgxLocationConf *locConf = GetOtelLocationConf(req);
 
-  if (locConf->captureHeaders) {
+  if (locConf->captureHeaders && captureHeaders) {
     OtelCaptureHeaders(span, ngx_string("http.response.header."), &req->headers_out.headers,
 #if (NGX_PCRE)
                        locConf->sensitiveHeaderNames, locConf->sensitiveHeaderValues,
@@ -559,9 +574,49 @@ ngx_int_t FinishNgxSpan(ngx_http_request_t* req) {
   AddScriptAttributes(span.get(), GetOtelMainConf(req)->scriptAttributes, req);
   AddScriptAttributes(span.get(), locConf->customAttributes, req);
 
+  if (req->headers_out.status >= 400 && req->headers_out.status <= 599) {
+    span->SetStatus(trace::StatusCode::kError);
+  }
+
   span->UpdateName(GetOperationName(req));
+}
+
+ngx_int_t FinishNgxSpan(ngx_http_request_t* req) {
+  if (!IsOtelEnabled(req)) {
+    return NGX_DECLINED;
+  }
+
+  if (req->internal) {
+    return NGX_DECLINED;
+  }
+
+  TraceContext* context = GetTraceContext(req);
+
+  /*
+   * When nginx fails to process request (bad request, prematurely closed) then span is not started, here we can start
+   * a new span because there were no upstream calls anyway.
+   */
+  if (!context) {
+    context = StartNgxTrace(req);
+  }
+
+  auto span = context->request_span;
+  UpdateSpan(span, req, true);
+
+  if (context->inner_span) {
+
+    const bool hasUpstream = req->upstream != nullptr;
+    if (hasUpstream) {
+      context->inner_span->SetAttribute("span.kind", static_cast<int>(trace::SpanKind::kClient));
+    }
+
+    UpdateSpan(context->inner_span, req);
+
+    context->inner_span->End();
+  }
 
   span->End();
+
   return NGX_DECLINED;
 }
 
@@ -576,7 +631,7 @@ static ngx_int_t InitModule(ngx_conf_t* conf) {
 
   const PhaseHandler handlers[] = {
     {NGX_HTTP_REWRITE_PHASE, StartNgxSpan},
-    {NGX_HTTP_LOG_PHASE, FinishNgxSpan},
+    {NGX_HTTP_LOG_PHASE, FinishNgxSpan}
   };
 
   for (const PhaseHandler& ph : handlers) {
@@ -1019,11 +1074,26 @@ static std::unique_ptr<sdktrace::SpanExporter> CreateExporter(const OtelNgxAgent
 
   switch (conf->exporter.type) {
     case OtelExporterOTLP: {
-      std::string endpoint = conf->exporter.endpoint;
-      otlp::OtlpGrpcExporterOptions opts{endpoint};
-      opts.use_ssl_credentials = conf->exporter.use_ssl_credentials;
-      opts.ssl_credentials_cacert_path = conf->exporter.ssl_credentials_cacert_path;
-      exporter.reset(new otlp::OtlpGrpcExporter(opts));
+
+      switch (conf->exporter.protocol) {
+        case gRPC: {
+          otlp::OtlpGrpcExporterOptions opts;
+          opts.endpoint = conf->exporter.endpoint;
+
+          opts.use_ssl_credentials = conf->exporter.use_ssl_credentials;
+          opts.ssl_credentials_cacert_path = conf->exporter.ssl_credentials_cacert_path;
+
+          exporter.reset(new otlp::OtlpGrpcExporter(opts));
+        }
+        break;
+        case HTTP: {
+          otlp::OtlpHttpExporterOptions opts;
+          opts.url = conf->exporter.endpoint;
+
+          exporter.reset(new otlp::OtlpHttpExporter(opts));
+        }
+        break;
+      }
       break;
     }
     default:
@@ -1035,6 +1105,7 @@ static std::unique_ptr<sdktrace::SpanExporter> CreateExporter(const OtelNgxAgent
 
 static std::unique_ptr<sdktrace::SpanProcessor>
 CreateProcessor(const OtelNgxAgentConfig* conf, std::unique_ptr<sdktrace::SpanExporter> exporter) {
+
   if (conf->processor.type == OtelProcessorBatch) {
     sdktrace::BatchSpanProcessorOptions opts;
     opts.max_queue_size = conf->processor.batch.maxQueueSize;
@@ -1043,11 +1114,11 @@ CreateProcessor(const OtelNgxAgentConfig* conf, std::unique_ptr<sdktrace::SpanEx
     opts.max_export_batch_size = conf->processor.batch.maxExportBatchSize;
 
     return std::unique_ptr<sdktrace::SpanProcessor>(
-      new sdktrace::BatchSpanProcessor(std::move(exporter), opts));
+      new PostBatchSpanProcessor(std::move(exporter), opts));
   }
 
   return std::unique_ptr<sdktrace::SpanProcessor>(
-    new sdktrace::SimpleSpanProcessor(std::move(exporter)));
+    new PostSpanProcessor(std::move(exporter)));
 }
 
 static std::unique_ptr<sdktrace::Sampler> CreateSampler(const OtelNgxAgentConfig* conf) {
diff --git a/instrumentation/nginx/src/post_batch_span_processor.cpp b/instrumentation/nginx/src/post_batch_span_processor.cpp
new file mode 100644
index 000000000..ad0398c95
--- /dev/null
+++ b/instrumentation/nginx/src/post_batch_span_processor.cpp
@@ -0,0 +1,8 @@
+#include "post_batch_span_processor.h"
+#include <opentelemetry/exporters/otlp/otlp_recordable.h>
+
+void PostBatchSpanProcessor::OnEnd(std::unique_ptr<opentelemetry::sdk::trace::Recordable> &&span) noexcept
+{
+  ProxyRecordable* proxy = static_cast<ProxyRecordable*>(span.get());
+  BatchSpanProcessor::OnEnd(std::move(proxy->GetRealRecordable()));
+}
diff --git a/instrumentation/nginx/src/post_batch_span_processor.h b/instrumentation/nginx/src/post_batch_span_processor.h
new file mode 100644
index 000000000..65c7ed6cc
--- /dev/null
+++ b/instrumentation/nginx/src/post_batch_span_processor.h
@@ -0,0 +1,27 @@
+#ifndef OPENTELEMETRY_NGINX_POST_BATCH_SPAN_PROCESSOR_H
+#define OPENTELEMETRY_NGINX_POST_BATCH_SPAN_PROCESSOR_H
+
+#include "proxy_recordable.h"
+#include <opentelemetry/nostd/shared_ptr.h>
+#include <opentelemetry/sdk/trace/batch_span_processor.h>
+
+namespace trace = opentelemetry::trace;
+namespace nostd = opentelemetry::nostd;
+namespace sdktrace = opentelemetry::sdk::trace;
+
+class PostBatchSpanProcessor : public sdktrace::BatchSpanProcessor {
+public:
+
+    explicit PostBatchSpanProcessor(std::unique_ptr<sdktrace::SpanExporter> &&exporter,
+                                    const sdktrace::BatchSpanProcessorOptions &options) noexcept
+            : BatchSpanProcessor(std::move(exporter), options)
+    {}
+
+    void OnEnd(std::unique_ptr<opentelemetry::sdk::trace::Recordable> &&span) noexcept override;
+
+    std::unique_ptr<opentelemetry::sdk::trace::Recordable> MakeRecordable() noexcept override {
+      return std::unique_ptr<ProxyRecordable>(new ProxyRecordable());
+    }
+};
+
+#endif //OPENTELEMETRY_NGINX_POST_BATCH_SPAN_PROCESSOR_H
diff --git a/instrumentation/nginx/src/post_span_processor.cpp b/instrumentation/nginx/src/post_span_processor.cpp
new file mode 100644
index 000000000..58b917cae
--- /dev/null
+++ b/instrumentation/nginx/src/post_span_processor.cpp
@@ -0,0 +1,8 @@
+#include "post_span_processor.h"
+
+void PostSpanProcessor::OnEnd(std::unique_ptr<opentelemetry::sdk::trace::Recordable> &&span) noexcept
+{
+  ProxyRecordable* proxy = static_cast<ProxyRecordable*>(span.get());
+  SimpleSpanProcessor::OnEnd(std::move(proxy->GetRealRecordable()));
+}
+
diff --git a/instrumentation/nginx/src/post_span_processor.h b/instrumentation/nginx/src/post_span_processor.h
new file mode 100644
index 000000000..19fd6326e
--- /dev/null
+++ b/instrumentation/nginx/src/post_span_processor.h
@@ -0,0 +1,26 @@
+#ifndef OPENTELEMETRY_NGINX_POST_SPAN_PROCESSOR_H
+#define OPENTELEMETRY_NGINX_POST_SPAN_PROCESSOR_H
+
+#include <opentelemetry/nostd/shared_ptr.h>
+#include <opentelemetry/sdk/trace/simple_processor.h>
+#include "proxy_recordable.h"
+
+namespace trace = opentelemetry::trace;
+namespace nostd = opentelemetry::nostd;
+namespace sdktrace = opentelemetry::sdk::trace;
+
+class PostSpanProcessor : public sdktrace::SimpleSpanProcessor {
+public:
+
+    explicit PostSpanProcessor(std::unique_ptr<sdktrace::SpanExporter> &&exporter) noexcept
+    : SimpleSpanProcessor(std::move(exporter))
+    {}
+
+    void OnEnd(std::unique_ptr<opentelemetry::sdk::trace::Recordable> &&span) noexcept override;
+
+    std::unique_ptr<opentelemetry::sdk::trace::Recordable> MakeRecordable() noexcept override {
+      return std::unique_ptr<ProxyRecordable>(new ProxyRecordable());
+    }
+};
+
+#endif //OPENTELEMETRY_NGINX_POST_SPAN_PROCESSOR_H
diff --git a/instrumentation/nginx/src/proxy_recordable.h b/instrumentation/nginx/src/proxy_recordable.h
new file mode 100644
index 000000000..3e36827ec
--- /dev/null
+++ b/instrumentation/nginx/src/proxy_recordable.h
@@ -0,0 +1,83 @@
+#ifndef OPENTELEMETRY_NGINX_PROXY_RECORDABLE_H
+#define OPENTELEMETRY_NGINX_PROXY_RECORDABLE_H
+
+#include <opentelemetry/exporters/otlp/otlp_recordable.h>
+
+namespace trace = opentelemetry::trace;
+namespace nostd = opentelemetry::nostd;
+namespace sdktrace = opentelemetry::sdk::trace;
+
+/**
+ * Wraps actual recordable object so we could override span.kind through SetAttribute. This workarounds the problem that
+ * in OpenTelemetry cpp SDK span kind is immutable on a span, but it causes problems for this instrumentation library.
+ */
+class ProxyRecordable : public sdktrace::Recordable {
+public:
+
+    ProxyRecordable()
+            : _realRecordable(new opentelemetry::exporter::otlp::OtlpRecordable()) { }
+
+    std::unique_ptr<opentelemetry::exporter::otlp::OtlpRecordable> GetRealRecordable() {
+      return std::unique_ptr<opentelemetry::exporter::otlp::OtlpRecordable>(std::move(_realRecordable));
+    }
+
+    void SetIdentity(const opentelemetry::trace::SpanContext &span_context,
+                     opentelemetry::trace::SpanId parent_span_id) noexcept override {
+      _realRecordable->SetIdentity(span_context, parent_span_id);
+    }
+
+    virtual void SetAttribute(nostd::string_view key,
+                              const opentelemetry::common::AttributeValue &value) noexcept override {
+      if (key == "span.kind") {
+        trace::SpanKind kind = static_cast<trace::SpanKind>(nostd::get<int>(value));
+        _realRecordable->SetSpanKind(kind);
+      } else {
+        _realRecordable->SetAttribute(key, value);
+      }
+    }
+
+    void AddEvent(nostd::string_view name,
+                  opentelemetry::common::SystemTimestamp timestamp,
+                  const opentelemetry::common::KeyValueIterable &attributes) noexcept override {
+      _realRecordable->AddEvent(name, timestamp, attributes);
+    };
+
+    void AddLink(const opentelemetry::trace::SpanContext &span_context,
+                 const opentelemetry::common::KeyValueIterable &attributes) noexcept override {
+      _realRecordable->AddLink(span_context, attributes);
+    };
+
+    void SetStatus(opentelemetry::trace::StatusCode code,
+                   nostd::string_view description) noexcept override {
+      _realRecordable->SetStatus(code, description);
+    };
+
+    void SetName(nostd::string_view name) noexcept override {
+      _realRecordable->SetName(name);
+    };
+
+    void SetSpanKind(opentelemetry::trace::SpanKind span_kind) noexcept override {
+      _realRecordable->SetSpanKind(span_kind);
+    };
+
+    void SetResource(const opentelemetry::sdk::resource::Resource &resource) noexcept override {
+      _realRecordable->SetResource(resource);
+    };
+
+    void SetStartTime(opentelemetry::common::SystemTimestamp start_time) noexcept override {
+      _realRecordable->SetStartTime(start_time);
+    };
+
+    void SetDuration(std::chrono::nanoseconds duration) noexcept override {
+      _realRecordable->SetDuration(duration);
+    };
+
+    void SetInstrumentationScope(const sdktrace::InstrumentationScope &instrumentation_scope) noexcept override {
+      _realRecordable->SetInstrumentationScope(instrumentation_scope);
+    };
+
+private:
+    std::unique_ptr<opentelemetry::exporter::otlp::OtlpRecordable> _realRecordable;
+};
+
+#endif //OPENTELEMETRY_NGINX_PROXY_RECORDABLE_H
diff --git a/instrumentation/nginx/src/trace_context.h b/instrumentation/nginx/src/trace_context.h
index de128e024..7548f826d 100644
--- a/instrumentation/nginx/src/trace_context.h
+++ b/instrumentation/nginx/src/trace_context.h
@@ -23,7 +23,11 @@ struct TraceContext {
   TraceContext(ngx_http_request_t* req) : request(req), traceHeader{} {}
   /* The current request being handled by nginx. */
   ngx_http_request_t* request;
+  /* Span used to record incoming requests */
   opentelemetry::nostd::shared_ptr<opentelemetry::trace::Span> request_span;
+  /* Span used to record internal processing. This span could be internal or client
+   * depending if nginx handles request locally or calls upstream */
+  opentelemetry::nostd::shared_ptr<opentelemetry::trace::Span> inner_span;
   /* Headers to be injected for the upstream request. */
   TraceHeader traceHeader[2];
 };
diff --git a/instrumentation/nginx/test/conf/nginx.conf b/instrumentation/nginx/test/conf/nginx.conf
index 8da508660..aa4a73660 100644
--- a/instrumentation/nginx/test/conf/nginx.conf
+++ b/instrumentation/nginx/test/conf/nginx.conf
@@ -61,8 +61,9 @@ http {
 
     location = /capture_headers_with_sensitive_header_name {
       opentelemetry_capture_headers on;
-      opentelemetry_sensitive_header_names "header";
+      opentelemetry_sensitive_header_names "header|token";
       add_header Response-Header Foo;
+      add_header Response-Token Bar;
       return 200 "";
     }
 
diff --git a/instrumentation/nginx/test/data/trace.json b/instrumentation/nginx/test/data/trace.json
index ef94ca9de..e69de29bb 100644
--- a/instrumentation/nginx/test/data/trace.json
+++ b/instrumentation/nginx/test/data/trace.json
@@ -1,2 +0,0 @@
-{"resourceSpans":[{"resource":{"attributes":[{"key":"telemetry.sdk.version","value":{"stringValue":"1.8.1"}},{"key":"telemetry.sdk.name","value":{"stringValue":"opentelemetry"}},{"key":"telemetry.sdk.language","value":{"stringValue":"cpp"}},{"key":"service.name","value":{"stringValue":"nginx-proxy"}}]},"instrumentationLibrarySpans":[{"instrumentationLibrary":{"name":"nginx"},"spans":[{"traceId":"777151ac132afc1975887f8a3af71d23","spanId":"60bec6e1671cee32","parentSpanId":"","name":"otel_test","kind":"SPAN_KIND_SERVER","startTimeUnixNano":"1658331753935660143","endTimeUnixNano":"1658331753935827215","attributes":[{"key":"http.method","value":{"stringValue":"GET"}},{"key":"http.flavor","value":{"stringValue":"1.1"}},{"key":"http.target","value":{"stringValue":"/route_to_internal"}},{"key":"http.server_name","value":{"stringValue":"otel_test"}},{"key":"http.host","value":{"stringValue":"localhost:8000"}},{"key":"http.user_agent","value":{"stringValue":"curl/7.68.0"}},{"key":"http.status_code","value":{"intValue":"200"}},{"key":"http.scheme","value":{"stringValue":"http"}},{"key":"net.host.port","value":{"intValue":"8000"}},{"key":"net.peer.ip","value":{"stringValue":"172.25.0.1"}},{"key":"net.peer.port","value":{"intValue":"51608"}},{"key":"test.attrib.global","value":{"stringValue":"global"}},{"key":"test.attrib.custom","value":{"stringValue":"global-custom"}}],"status":{}}]}]}]}
-{"resourceSpans":[{"resource":{"attributes":[{"key":"telemetry.sdk.version","value":{"stringValue":"1.8.1"}},{"key":"telemetry.sdk.name","value":{"stringValue":"opentelemetry"}},{"key":"telemetry.sdk.language","value":{"stringValue":"cpp"}},{"key":"service.name","value":{"stringValue":"nginx-proxy"}}]},"instrumentationLibrarySpans":[{"instrumentationLibrary":{"name":"nginx"},"spans":[{"traceId":"579d297c39ddac461fbc50febd77f16a","spanId":"fecfc6a8c9b60f03","parentSpanId":"","name":"otel_test","kind":"SPAN_KIND_SERVER","startTimeUnixNano":"1658331755134563590","endTimeUnixNano":"1658331755134700342","attributes":[{"key":"http.method","value":{"stringValue":"GET"}},{"key":"http.flavor","value":{"stringValue":"1.1"}},{"key":"http.target","value":{"stringValue":"/route_to_internal"}},{"key":"http.server_name","value":{"stringValue":"otel_test"}},{"key":"http.host","value":{"stringValue":"localhost:8000"}},{"key":"http.user_agent","value":{"stringValue":"curl/7.68.0"}},{"key":"http.status_code","value":{"intValue":"200"}},{"key":"http.scheme","value":{"stringValue":"http"}},{"key":"net.host.port","value":{"intValue":"8000"}},{"key":"net.peer.ip","value":{"stringValue":"172.25.0.1"}},{"key":"net.peer.port","value":{"intValue":"51614"}},{"key":"test.attrib.global","value":{"stringValue":"global"}},{"key":"test.attrib.custom","value":{"stringValue":"global-custom"}}],"status":{}}]}]}]}
\ No newline at end of file
diff --git a/instrumentation/nginx/test/instrumentation/lib/mix/tasks/dockerfiles.ex b/instrumentation/nginx/test/instrumentation/lib/mix/tasks/dockerfiles.ex
index c3300137c..00d2e948e 100644
--- a/instrumentation/nginx/test/instrumentation/lib/mix/tasks/dockerfiles.ex
+++ b/instrumentation/nginx/test/instrumentation/lib/mix/tasks/dockerfiles.ex
@@ -193,7 +193,7 @@ defmodule Mix.Tasks.Dockerfiles do
         -DCMAKE_PREFIX_PATH=/install \\
         -DWITH_OTLP=ON \\
         -DWITH_OTLP_GRPC=ON \\
-        -DWITH_OTLP_HTTP=OFF \\
+        -DWITH_OTLP_HTTP=ON \\
         -DBUILD_TESTING=OFF \\
         -DWITH_EXAMPLES=OFF \\
         -DCMAKE_CXX_STANDARD=17 \\
diff --git a/instrumentation/nginx/test/instrumentation/package-lock.json b/instrumentation/nginx/test/instrumentation/package-lock.json
new file mode 100644
index 000000000..252dce6da
--- /dev/null
+++ b/instrumentation/nginx/test/instrumentation/package-lock.json
@@ -0,0 +1,1944 @@
+{
+  "name": "instrumentation",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "instrumentation",
+      "version": "1.0.0",
+      "devDependencies": {
+        "axios": "^1.4.0",
+        "choma": "^1.2.1",
+        "docker-compose": "^0.24.0",
+        "mocha": "^10.2.0",
+        "tail": "^2.2.6"
+      }
+    },
+    "node_modules/ansi-colors": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/anymatch": {
+      "version": "3.1.3",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.3.tgz",
+      "integrity": "sha512-KMReFUr0B4t+D+OBkjR3KYqvocp2XaSzO55UcB6mgQMd3KbcE+mWTyvVV7D/zsdEbNnV6acZUutkiHQXvTr1Rw==",
+      "dev": true,
+      "dependencies": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/argparse": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+      "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
+      "dev": true
+    },
+    "node_modules/asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha512-Oei9OH4tRh0YqU3GxhX79dM/mwVgvbZJaSNaRk+bshkj0S5cfHcgYakreBjrHwatXKbz+IoIdYLxrKim2MjW0Q==",
+      "dev": true
+    },
+    "node_modules/axios": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-1.4.0.tgz",
+      "integrity": "sha512-S4XCWMEmzvo64T9GfvQDOXgYRDJ/wsSZc7Jvdgx5u1sd0JwsuPLqb3SYmusag+edF6ziyMensPVqLTSc1PiSEA==",
+      "dev": true,
+      "dependencies": {
+        "follow-redirects": "^1.15.0",
+        "form-data": "^4.0.0",
+        "proxy-from-env": "^1.1.0"
+      }
+    },
+    "node_modules/balanced-match": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
+      "dev": true
+    },
+    "node_modules/binary-extensions": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
+      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/brace-expansion": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
+      "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
+      "dev": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
+    "node_modules/braces": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "dev": true,
+      "dependencies": {
+        "fill-range": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/browser-stdout": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "dev": true
+    },
+    "node_modules/camelcase": {
+      "version": "6.3.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.3.0.tgz",
+      "integrity": "sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/chalk/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/chokidar": {
+      "version": "3.5.3",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz",
+      "integrity": "sha512-Dr3sfKRP6oTcjf2JmUmFJfeVMvXBdegxB0iVQ5eb2V10uFJUCAS8OByZdVAyVb8xXNz3GjjTgj9kLWsZTqE6kw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ],
+      "dependencies": {
+        "anymatch": "~3.1.2",
+        "braces": "~3.0.2",
+        "glob-parent": "~5.1.2",
+        "is-binary-path": "~2.1.0",
+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
+        "readdirp": "~3.6.0"
+      },
+      "engines": {
+        "node": ">= 8.10.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.2"
+      }
+    },
+    "node_modules/choma": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/choma/-/choma-1.2.1.tgz",
+      "integrity": "sha512-4KwEouEHt6SfG8vYnN2gSJfq/cGmnY2gubnUgsgkRXzHoSRAgluX2YXQgDg6bTDWuOmUrTb/cfwMpNlvnnPZCg==",
+      "dev": true,
+      "dependencies": {
+        "chalk": "^2.3.2",
+        "seedrandom": "^2.4.3"
+      },
+      "peerDependencies": {
+        "mocha": ">=2"
+      }
+    },
+    "node_modules/choma/node_modules/ansi-styles": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^1.9.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/choma/node_modules/chalk": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.4.2.tgz",
+      "integrity": "sha512-Mti+f9lpJNcwF4tWV8/OrTTtF1gZi+f8FqlyAdouralcFWFQWF2+NgCHShjkCb+IFBLq9buZwE1xckQU4peSuQ==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^3.2.1",
+        "escape-string-regexp": "^1.0.5",
+        "supports-color": "^5.3.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/choma/node_modules/color-convert": {
+      "version": "1.9.3",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
+      "integrity": "sha512-QfAUtd+vFdAtFQcC8CCyYt1fYWxSqAiK2cSD6zDB8N3cpsEBAvRxp9zOGg6G/SHHJYAT88/az/IuDGALsNVbGg==",
+      "dev": true,
+      "dependencies": {
+        "color-name": "1.1.3"
+      }
+    },
+    "node_modules/choma/node_modules/color-name": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "integrity": "sha512-72fSenhMw2HZMTVHeCA9KCmpEIbzWiQsjN+BHcBbS9vr1mtt+vJjPdksIBNUmKAW8TFUDPJK5SUU3QhE9NEXDw==",
+      "dev": true
+    },
+    "node_modules/choma/node_modules/escape-string-regexp": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
+      "integrity": "sha512-vbRorB5FUQWvla16U8R/qgaFIya2qGzwDrNmCZuYKrbdSUMG6I1ZCGQRefkRVhuOkIGVne7BQ35DSfo1qvJqFg==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/choma/node_modules/has-flag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
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+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/choma/node_modules/supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
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+      "dev": true,
+      "dependencies": {
+        "has-flag": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/cliui": {
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
+      "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^7.0.0"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dev": true,
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
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diff --git a/instrumentation/nginx/test/instrumentation/package.json b/instrumentation/nginx/test/instrumentation/package.json
new file mode 100644
index 000000000..8e088e484
--- /dev/null
+++ b/instrumentation/nginx/test/instrumentation/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "instrumentation",
+  "version": "1.0.0",
+  "scripts": {
+    "test": "mocha --require choma test.js"
+  },
+  "devDependencies": {
+    "axios": "^1.4.0",
+    "choma": "^1.2.1",
+    "docker-compose": "^0.24.0",
+    "mocha": "^10.2.0",
+    "tail": "^2.2.6"
+  }
+}
diff --git a/instrumentation/nginx/test/instrumentation/test.js b/instrumentation/nginx/test/instrumentation/test.js
new file mode 100644
index 000000000..c06066c10
--- /dev/null
+++ b/instrumentation/nginx/test/instrumentation/test.js
@@ -0,0 +1,782 @@
+const { logs, upAll, stop } = require('docker-compose');
+const assert = require('assert');
+const path = require('path');
+const Tail = require('tail').Tail;
+const axios = require('axios');
+const fs = require('fs').promises;
+
+const host = 'http://localhost:8000';
+const traceFile = path.join(__dirname, '../data/trace.json');
+
+async function waitForStatup(name, startupCheck) {
+    return new Promise((resolve, reject) => {
+        logs(name, { follow: true, cwd: path.join(__dirname, '../'), callback: (chunk) => {
+            const line = chunk.toString('utf8');
+            if (startupCheck(line)) {
+                resolve();
+            }
+        }})
+        .catch(reject);
+    });
+}
+
+async function startServicesAndWait(services) {
+
+    // Make sure collector is able to write to trace.json
+    await fs.chmod(traceFile, 0666);
+
+    return new Promise((resolve, reject) => {
+        upAll({
+            cwd: path.join(__dirname, '../'),
+            // log: true,
+        })
+        .then(async () => {
+            
+            await Promise.all(
+                services
+                    .filter(service => service.startupCheck !== undefined)
+                    .map(service => waitForStatup(service.name, service.startupCheck))
+            );
+
+            resolve();
+        })
+        .catch(reject);
+    });
+}
+
+async function waitNginx() {
+    return new Promise(async (resolve) => {
+        while (true) {
+            try {
+                console.log(`Waiting for nginx to be up...`);
+                await axios.get(`${host}/up`);
+                resolve();
+                break;
+            } catch (ex) {
+                await new Promise((resolve) => setTimeout(resolve, 1000));
+            }
+        }
+    });
+}
+
+async function getTrace(traceStream, timeout ) {
+    return new Promise((resolve, reject) => {
+        
+        const listener = (line) => {
+            try {
+                const traceLine = JSON.parse(line);
+                resolve(traceLine);
+            } catch (ex) {
+                reject(ex);
+            }
+        }
+
+        traceStream.once('line', listener);
+
+        if (timeout) {
+            setTimeout(() => { 
+                traceStream.removeListener('line', listener);
+                reject(new Error('timeout'));
+            }, timeout);
+        }
+    });
+}
+
+function attribValue(attribute) {
+    if (!attribute || !attribute.value) return undefined;
+    if (attribute.value.stringValue) return attribute.value.stringValue;
+    if (attribute.value.intValue) return parseInt(attribute.value.intValue);
+    if (attribute.value.arrayValue) return attribute.value.arrayValue.values.map((value) => attribValue({ value }));
+    else return undefined;
+}
+
+function validateResourceAttributes(attributes, expectedAttributes) {
+    expectedAttributes.forEach((expectedAttribute) => {
+        
+        const value = attribValue(attributes.find((attrib) => attrib.key === expectedAttribute.key));
+
+        if (expectedAttribute.fn) {
+            assert(expectedAttribute.fn(value));
+        } else if (expectedAttribute.regex) {
+            assert.match(value, expectedAttribute.regex);
+        } else {
+            if (Array.isArray(expectedAttribute.value)) {
+                assert.deepEqual(value, expectedAttribute.value);   
+            } else {
+                assert.equal(value, expectedAttribute.value);
+            }
+        }
+    });
+}
+
+const commonExpectedAttributes = [
+    // { key: 'service.name', value: 'nginx' },
+    { key: 'telemetry.sdk.name', value: 'opentelemetry' },
+    { key: 'telemetry.sdk.language', value: 'cpp' },
+    { key: 'telemetry.sdk.version', value: '1.8.1' },
+];
+
+describe('instrumentation-test', function () {
+
+    traceStream = null;
+
+    before('setup', async function () {
+        this.timeout(30000);
+        const services = [{
+            name: 'collector',
+            startupCheck: (line) => line.includes('Everything is ready.')
+        }, {
+            name: 'node-backend',
+            startupCheck: (line) => line.includes('simple_express ready')
+        }, {
+            name: 'nginx',
+        }, {
+            name: 'php-backend',
+        }];
+
+        await startServicesAndWait(services);
+
+        // Wait Nginx
+        await waitNginx();
+
+        // Open stream to ../data/trace.json
+        traceStream = new Tail(traceFile);
+        return;
+    });
+
+    after('cleanup', async function () {
+        this.timeout(30000);
+        traceStream.unwatch();
+        await stop({ cwd: path.join(__dirname, '../') }).then(() => console.log('Stopped'));
+    });
+
+    it('HTTP upstream | resource attributes', async function () {
+
+        this.timeout(5000);
+
+        const res = await axios.get(`${host}/?foo=bar&x=42`);
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        assert.equal(trace.resourceSpans[0].instrumentationLibrarySpans.length, 1);
+        assert.equal(trace.resourceSpans[0].instrumentationLibrarySpans[0].spans.length, 1);
+        assert.equal(trace.resourceSpans[0].instrumentationLibrarySpans[0].spans[0].kind, "SPAN_KIND_CLIENT");
+
+        assert.equal(trace.resourceSpans[1].instrumentationLibrarySpans.length, 1);
+        assert.equal(trace.resourceSpans[1].instrumentationLibrarySpans[0].spans.length, 1);
+        assert.equal(trace.resourceSpans[1].instrumentationLibrarySpans[0].spans[0].kind, "SPAN_KIND_SERVER");
+
+        trace.resourceSpans.forEach((resourceSpan) => {
+            validateResourceAttributes(resourceSpan.resource.attributes, [
+                ...commonExpectedAttributes,
+                { key: 'service.name', value: 'nginx-proxy' }
+            ]);
+        });
+    })
+
+    it("HTTP upstream | span attributes", async function () {
+
+        const res = await axios.get(`${host}/?foo=bar&x=42`, { 
+            headers: {
+                "User-Agent": "otel-test",
+                "My-Header": "My-Value"
+            }
+        });
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        trace.resourceSpans.forEach((resourceSpan) => {
+
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            validateResourceAttributes(resourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+                { key: 'net.peer.ip', regex: /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/ },
+                { key: 'net.peer.port', fn: (actual) => actual > 0 },
+                { key: 'http.method', value: 'GET' },
+                { key: 'http.flavor', value: '1.1' },
+                { key: 'http.target', value: '/?foo=bar&x=42' },
+                { key: 'http.host', value: 'localhost:8000' },
+                { key: 'http.server_name', value: 'otel_test' },
+                { key: 'http.scheme', value: 'http' },
+                { key: 'http.status_code', value: 200 },
+                { key: 'http.user_agent', value: 'otel-test' },
+                { key: 'http.request.header.host', value: undefined },
+                { key: 'http.request.header.user_agent', value: undefined },
+                { key: 'http.request.header.my_header', value: undefined },
+            ]);
+        });
+
+        assert.equal(trace.resourceSpans[0].instrumentationLibrarySpans[0].spans[0].kind, "SPAN_KIND_CLIENT");
+        assert.equal(trace.resourceSpans[0].instrumentationLibrarySpans[0].spans[0].name, "simple_backend");
+        assert.equal(trace.resourceSpans[1].instrumentationLibrarySpans[0].spans[0].kind, "SPAN_KIND_SERVER");
+        assert.equal(trace.resourceSpans[1].instrumentationLibrarySpans[0].spans[0].name, "simple_backend");
+    })
+
+    it("location with opentelemetry_capture_headers on should capture headers", async function() {
+
+        const res = await axios.get(`${host}/capture_headers`, { 
+            headers: {
+                "Request-Header": "Request-Value"
+            }
+        });
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        // Check server span only
+        const resourceSpan = trace.resourceSpans[1];
+
+        assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+        assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+        validateResourceAttributes(resourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+            { key: 'http.request.header.host', value: undefined },
+            { key: 'http.request.header.user_agent', value: undefined },
+            { key: 'http.request.header.request_header', value: ['Request-Value'] },
+            { key: 'http.response.header.response_header', value: ['Response-Value'] },
+        ]);
+    });
+
+    
+    it("location with opentelemetry_capture_headers and sensitive header name should redact header value", async function () {
+
+        const res = await axios.get(`${host}/capture_headers_with_sensitive_header_name`, { 
+            headers: {
+                "Request-Header": "Foo",
+                "Request-Token": "Token",
+            }
+        });
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        // Check server span only
+        const resourceSpan = trace.resourceSpans[1];
+
+        assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+        assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+        validateResourceAttributes(resourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+            { key: 'http.request.header.host', value: undefined },
+            { key: 'http.request.header.user_agent', value: undefined },
+            { key: 'http.request.header.request_header', value: ['[REDACTED]'] },
+            { key: 'http.response.header.response_header', value: ['[REDACTED]'] },
+            { key: 'http.request.header.request_token', value: ['[REDACTED]'] },
+            { key: 'http.response.header.response_token', value: ['[REDACTED]'] },
+        ]);
+    });
+
+    it("location with opentelemetry_capture_headers and sensitive header value should redact header value", async function () {
+
+        const res = await axios.get(`${host}/capture_headers_with_sensitive_header_value`, {
+            headers: {
+                "Bar": "Request-Value"
+            }
+        });
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        // Check server span only
+        const resourceSpan = trace.resourceSpans[1];
+
+        assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+        assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+        validateResourceAttributes(resourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+            { key: 'http.request.header.host', value: undefined },
+            { key: 'http.request.header.user_agent', value: undefined },
+            { key: 'http.request.header.bar', value: ['[REDACTED]'] },
+            { key: 'http.response.header.bar', value: ['[REDACTED]'] },
+        ]);
+    });
+
+    it("location without operation name should use operation name from server", async function () {
+
+        const res = await axios.get(`${host}/no_operation_name`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        trace.resourceSpans.forEach((resourceSpan) => {
+
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].name, "otel_test");
+
+        });
+    });
+
+    it("HTTP upstream | span is created when no traceparent exists", async function() {
+        
+        const res = await axios.get(`${host}`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        trace.resourceSpans.forEach((resourceSpan, idx) => {
+            
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            validateResourceAttributes(resourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+                { key: 'http.status_code', value: 200 },
+            ]);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].kind, idx === 0 ? "SPAN_KIND_CLIENT" : "SPAN_KIND_SERVER");
+            if (idx === 1) {
+                assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].parentSpanId, "");
+            }
+        });
+    });
+
+    it("HTTP upstream | span is associated with parent", async function() {
+        
+        const parentSpanId = "2a9d49c3e3b7c461"
+        const inputTraceId = "aad85b4f655feed4d594a01cfa6a1d62"
+    
+        const res = await axios.get(host, {
+            headers: {
+                "traceparent": `00-${inputTraceId}-${parentSpanId}-00`
+            }
+        });
+    
+        assert.equal(res.status, 200);
+    
+        const parsedBody = res.data;
+    
+        const [prefix, traceId, spanId, suffix] = parsedBody.traceparent.split('-');
+    
+        assert.equal(prefix, '00');
+        assert.equal(traceId, inputTraceId);
+        assert.notEqual(spanId, parentSpanId);
+        assert.equal(suffix, '01');
+    
+        const traces = await getTrace(traceStream);
+    
+        assert.equal(traces.resourceSpans.length, 2);
+        
+        const serverResourceSpan = traces.resourceSpans[1];
+    
+        assert(serverResourceSpan.instrumentationLibrarySpans.length, 1);
+        assert(serverResourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+    
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans[0].traceId, inputTraceId);
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans[0].parentSpanId, parentSpanId);
+    
+    });
+
+    it("PHP-FPM upstream | span attributes", async function() {
+
+        const res = await axios.get(`${host}/app.php`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+        
+        trace.resourceSpans.forEach((resourceSpan, idx) => {
+
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            validateResourceAttributes(resourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+                { key: 'net.peer.ip', regex: /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/ },
+                { key: 'net.peer.port', fn: (actual) => actual > 0 },
+                { key: 'http.method', value: 'GET' },
+                { key: 'http.flavor', value: '1.1' },
+                { key: 'http.target', value: '/app.php' },
+                { key: 'http.host', value: 'localhost:8000' },
+                { key: 'http.server_name', value: 'otel_test' },
+                { key: 'http.scheme', value: 'http' },
+                { key: 'http.status_code', value: 200 },
+            ]);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].kind, idx === 0 ? "SPAN_KIND_CLIENT" : "SPAN_KIND_SERVER");
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].name, "php_fpm_backend");
+
+        });
+    });
+
+    it("PHP-FPM upstream | span is associated with parent", async function() {
+
+        const parentSpanId = "2a9d49c3e3b7c461"
+        const inputTraceId = "aad85b4f655feed4d594a01cfa6a1d62"
+    
+        const res = await axios.get(`${host}/app.php`, {
+            headers: {
+                "traceparent": `00-${inputTraceId}-${parentSpanId}-00`
+            }
+        });
+    
+        assert.equal(res.status, 200);
+    
+        const parsedBody = res.data;
+    
+        const [prefix, traceId, spanId, suffix] = parsedBody.traceparent.split('-');
+    
+        assert.equal(prefix, '00');
+        assert.equal(traceId, inputTraceId);
+        assert.notEqual(spanId, parentSpanId);
+        assert.equal(suffix, '01');
+    
+        const traces = await getTrace(traceStream);
+    
+        assert.equal(traces.resourceSpans.length, 2);
+        
+        const serverResourceSpan = traces.resourceSpans[1];
+    
+        assert(serverResourceSpan.instrumentationLibrarySpans.length, 1);
+        assert(serverResourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+    
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans[0].traceId, inputTraceId);
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans[0].parentSpanId, parentSpanId);
+    });
+
+    it("HTTP upstream | test b3 injection", async function() {
+
+        const res = await axios.get(`${host}/b3`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        trace.resourceSpans.forEach((resourceSpan, idx) => {
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].name, "test_b3");
+            if (idx === 1) {
+                assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].parentSpanId, "");
+            }
+        });
+    });
+
+    it("PHP-FPM upstream | test b3 injection", async function() {
+
+        const res = await axios.get(`${host}/b3`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        trace.resourceSpans.forEach((resourceSpan, idx) => {
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].name, "test_b3");
+            if (idx === 1) {
+                assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].parentSpanId, "");
+            }
+        });
+    });
+
+    it("HTTP upstream | test b3 propagation", async function() {
+
+        const parentSpanId = "2a9d49c3e3b7c461"
+        const inputTraceId = "aad85b4f655feed4d594a01cfa6a1d62"
+
+        const res = await axios.get(`${host}/b3`, {
+            headers: {
+                "b3": `${inputTraceId}-${parentSpanId}-1`
+            }
+        });
+
+        assert.equal(res.status, 200);
+
+        const parsedBody = res.data;
+        const [traceId, spanId] = parsedBody.b3.split('-');
+
+        assert.equal(traceId, inputTraceId);
+        assert.notEqual(spanId, parentSpanId);
+
+        const traces = await getTrace(traceStream);
+
+        assert.equal(traces.resourceSpans.length, 2);
+
+        traces.resourceSpans.forEach((resourceSpan) => {
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].traceId, inputTraceId);
+            assert.notEqual(resourceSpan.instrumentationLibrarySpans[0].spans[0].spanId, parentSpanId);
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].name, "test_b3");
+        });
+    });
+
+    it("HTTP upstream | multiheader b3 propagation", async function() {
+
+        const parentSpanId = "2a9d49c3e3b7c461"
+        const inputTraceId = "aad85b4f655feed4d594a01cfa6a1d62"
+
+        const res = await axios.get(`${host}/b3`, {
+            headers: {
+                "X-B3-TraceId": inputTraceId,
+                "X-B3-SpanId": parentSpanId,
+                "X-B3-Sampled": "1"
+            }
+        });
+
+        assert.equal(res.status, 200);
+
+        const parsedBody = res.data;
+        const [traceId, spanId] = parsedBody.b3.split('-');
+
+        assert.equal(traceId, inputTraceId);
+        assert.notEqual(spanId, parentSpanId);
+
+        const traces = await getTrace(traceStream);
+
+        assert.equal(traces.resourceSpans.length, 2);
+
+        traces.resourceSpans.forEach((resourceSpan) => {
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].traceId, inputTraceId);
+            assert.notEqual(resourceSpan.instrumentationLibrarySpans[0].spans[0].spanId, parentSpanId);
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].name, "test_b3");
+        });
+    });
+
+    it("Accessing a file produces a span", async function() {
+
+        const res = await axios.get(`${host}/files/content.txt`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(res.data, "Lorem Ipsum");
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        trace.resourceSpans.forEach((resourceSpan, idx) => {
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].name, "file_access");
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].kind, idx === 0 ? "SPAN_KIND_INTERNAL" : "SPAN_KIND_SERVER");
+
+            validateResourceAttributes(resourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+                { key: 'http.method', value: 'GET' },
+                { key: 'http.flavor', value: '1.1' },
+                { key: 'http.target', value: '/files/content.txt' },
+                { key: 'http.host', value: 'localhost:8000' },
+                { key: 'http.server_name', value: 'otel_test' },
+                { key: 'http.scheme', value: 'http' },
+                { key: 'http.status_code', value: 200 },
+            ]);
+        });
+    });
+
+    it("Accessing a excluded uri produces no span", async function() {
+
+        const res = await axios.get(`${host}/ignored.php`);
+
+        assert.equal(res.status, 200);
+
+        try {
+            await getTrace(traceStream, 1000);
+            assert.fail('expected timeout');
+        } catch(ex) {
+            assert.equal(ex.message, 'timeout');
+        }
+    });
+
+    it("Accessing a route with disabled OpenTelemetry does not produce spans nor propagate", async function() {
+
+        const res = await axios.get(`${host}/off`);
+
+        assert.equal(res.status, 200);
+
+        try {
+            await getTrace(traceStream, 1000);
+            assert.fail('expected timeout');
+        } catch (ex) {
+            assert.equal(ex.message, 'timeout');
+        }
+    });
+
+    it("Accessing a route with disabled trustIncomingsSpans is not associated with a parent", async function() {
+
+        const inputTraceId = "aad85b4f655feed4d594a01cfa6a1d62"
+
+        const res = await axios.get(`${host}/distrust_incoming_spans`, {
+            headers: {
+                "traceparent": `00-${inputTraceId}-2a9d49c3e3b7c461-00`
+            }
+        });
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+        
+        const serverResourceSpan = trace.resourceSpans[1];
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans.length, 1);
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+        assert.notEqual(serverResourceSpan.instrumentationLibrarySpans[0].spans[0].traceId, inputTraceId);
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans[0].parentSpanId, "");
+    });
+
+    it("Spans with custom attributes are produced", async function() {
+
+        const res = await axios.get(`${host}/attrib`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+        
+        const serverResourceSpan = trace.resourceSpans[1];
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans.length, 1);
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+        validateResourceAttributes(serverResourceSpan.instrumentationLibrarySpans[0].spans[0].attributes, [
+            { key: 'test.attrib.custom', value: 'local' },
+            { key: 'test.attrib.global', value: 'global' },
+            { key: 'test.attrib.script', regex: /\d+\.\d+/ },
+        ]);
+    });
+
+    it("Accessing trace context", async function() {
+
+        const res = await axios.get(`${host}/context`);
+
+        assert.equal(res.status, 200);
+
+        const traces = await getTrace(traceStream);
+
+        assert.equal(traces.resourceSpans.length, 2);
+
+        const innerResourceSpan = traces.resourceSpans[0];
+
+        assert.equal(innerResourceSpan.instrumentationLibrarySpans.length, 1);
+        assert.equal(innerResourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+        const span = innerResourceSpan.instrumentationLibrarySpans[0].spans[0];
+        const traceId = span.traceId;
+        const spanId = span.spanId;
+
+        const traceparent = res.headers['context-traceparent'];
+        assert(traceparent);
+
+        assert.equal(traceparent, `00-${traceId}-${spanId}-01`);
+    });
+
+    it("Accessing trace id", async function() {
+
+        const res = await axios.get(`${host}/trace_id`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        const serverResourceSpan = trace.resourceSpans[1];
+        const span = serverResourceSpan.instrumentationLibrarySpans[0].spans[0];
+
+        const traceId = span.traceId;
+
+        const traceIdHeader = res.headers['trace-id'];
+        assert(traceIdHeader);
+
+        assert.equal(traceIdHeader, traceId);
+    });
+
+    it("Accessing span id", async function() {
+
+        const res = await axios.get(`${host}/span_id`);
+
+        assert.equal(res.status, 200);
+
+        const trace = await getTrace(traceStream);
+
+        assert.equal(trace.resourceSpans.length, 2);
+
+        const serverResourceSpan = trace.resourceSpans[1];
+
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans.length, 1);
+        assert.equal(serverResourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+        const span = serverResourceSpan.instrumentationLibrarySpans[0].spans[0];
+
+        const spanId = span.spanId;
+
+        const spanIdHeader = res.headers['span-id'];
+        assert(spanIdHeader);
+
+        assert.equal(spanIdHeader, spanId);
+    });
+
+    it("Accessing 301 redirect does not crash", async function () {
+
+        const res = await axios.get(`${host}/redirect_301`, {
+            maxRedirects: 0,
+            validateStatus: (status) => {
+                return status === 301;
+            }
+        });
+
+        assert.equal(res.status, 301);
+
+        const headers = res.headers;
+        assert.equal(headers['location'], `${host}/redirect_301/`);
+
+        await getTrace(traceStream);
+    });
+
+    it("Accessing internal request does not crash", async function () {
+
+        const res = await axios.get(`${host}/route_to_internal`);
+
+        assert.equal(res.status, 200);
+
+        const headers = res.headers;
+        const traceId = headers['trace-id'];
+
+        assert(traceId);
+
+        const traces = await getTrace(traceStream);
+
+        assert.equal(traces.resourceSpans.length, 2);
+
+        traces.resourceSpans.forEach((resourceSpan) => {
+            assert(resourceSpan.instrumentationLibrarySpans.length, 1);
+            assert(resourceSpan.instrumentationLibrarySpans[0].spans.length, 1);
+
+            assert.equal(resourceSpan.instrumentationLibrarySpans[0].spans[0].traceId, traceId);
+        });
+    });
+
+});