Configure HttpClientHandler

[grounzero]

Is it possible to configure an HttpClientHandler using HttpClientBuilder?

I'd like to do something like this.

.AddReverseProxy()
.ConfigureHttpClient(builder => builder.ConfigurePrimaryHttpMessageHandler(() => new HttpClientHandler { ... }))

Even better if I could do it entirely in configuration.

Is there an example on how to do this?

[Tratcher]

See https://microsoft.github.io/reverse-proxy/articles/proxyhttpclientconfig.html

[grounzero]

Thanks, what I'm trying to do is authenticate to a destination hosted in IIS that uses Windows auth using the proxy's own user but getting a weird error. Using net5.0 and Yarp 1.0.0-preview.11.21223.5

Probing the destination returns a 401.

I specified http 1.1 in the config

        "HttpClient": {
          "HttpRequest": {
            "Version": "1.1",
            "VersionPolicy": "RequestVersionExact",
            "Timeout": "00:00:30"
          }
        }

And setup the credentials in code.

        .AddReverseProxy()
            .ConfigureHttpClient((context, handler) => {
                handler.PreAuthenticate = true;
                handler.Credentials = CredentialCache.DefaultCredentials;
            }).LoadFromConfig(hostContext.Configuration.GetSection("ReverseProxy"))

System.IO.IOException: The request was aborted.
 ---> System.Net.Http.Http2StreamException: The HTTP/2 server reset the stream. HTTP/2 error code 'HTTP_1_1_REQUIRED' (0xd).
   --- End of inner exception stack trace ---
   at System.Net.Http.Http2Connection.ThrowRequestAborted(Exception innerException)
   at System.Net.Http.Http2Connection.Http2Stream.CheckResponseBodyState()
   at System.Net.Http.Http2Connection.Http2Stream.TryEnsureHeaders()
   at System.Net.Http.Http2Connection.Http2Stream.ReadResponseHeadersAsync(CancellationToken cancellationToken)
   at System.Net.Http.Http2Connection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at System.Net.Http.Http2Connection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.AuthenticationHelper.SendWithAuthAsync(HttpRequestMessage request, Uri authUri, Boolean async, ICredentials credentials, Boolean preAuthenticate, Boolean isProxyAuth, Boolean doRequestAuth, HttpConnectionPool pool, CancellationToken cancellationToken)
   at Yarp.ReverseProxy.Service.Proxy.HttpProxy.ProxyAsync(HttpContext context, String destinationPrefix, HttpMessageInvoker httpClient, RequestProxyOptions requestOptions, HttpTransformer transformer)

[Tratcher]

The HttpRequest section goes adjacent to the HttpClient section, not inside of it.

    "HttpClient": {
    },
    "HttpRequest": {
      "Version": "1.1",
      "VersionPolicy": "RequestVersionExact",
      "Timeout": "00:00:30"
    }

[grounzero]

Thank you!

[ycoding]

@grounzero
Were you able to forward requests to an endpoint that requires Windows authentication? If so, please provide me with the steps?
I'm using YARP 2.1 I like to forward requests to a WebAPI developed in dotnet core 6 and requires Windows authentication, I like to configure YARP to use a gMSA account to get authenticated, I configured the HttpClient but I'm getting 401 UnAuthorized!