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Spring RestTemplate Logger

Spring RestTemplate customizer to log HTTP traffic.

Getting started

Add a dependency to your Maven project:

<dependency>
	<groupId>org.hobsoft.spring</groupId>
	<artifactId>spring-rest-template-logger</artifactId>
	<version>2.0.0</version>
</dependency>

Customize your RestTemplate as follows:

RestTemplate restTemplate = new RestTemplateBuilder()
	.customizers(new LoggingCustomizer())
	.build();

Ensure that debug logging is enabled in application.properties:

logging.level.org.hobsoft.spring.resttemplatelogger.LoggingCustomizer = DEBUG

Now all RestTemplate HTTP traffic will be logged to org.hobsoft.spring.resttemplatelogger.LoggingCustomizer at debug level:

2020-02-09 10:59:48.954 DEBUG 17602 --- [nio-8080-exec-1] o.h.s.r.LoggingCustomizer                : Request: GET http://example.com/ 
2020-02-09 10:59:49.291 DEBUG 17602 --- [nio-8080-exec-1] o.h.s.r.LoggingCustomizer                : Response: 200 <!doctype html>
<html>
<head>
    <title>Example Domain</title>
...

See the demo Spring Boot application to see this in action.

Configuration

Using a different logger

To log HTTP traffic to an alternative logger, simply pass it to the customizer:

RestTemplate restTemplate = new RestTemplateBuilder()
	.customizers(new LoggingCustomizer(LogFactory.getLog("my.http.log")))
	.build();

Customising the log format

To use a different format when logging HTTP traffic, implement LogFormatter and pass it to the customizer:

RestTemplate restTemplate = new RestTemplateBuilder()
	.customizers(new LoggingCustomizer(LogFactory.getLog(LoggingCustomizer.class), new MyLogFormatter()))
	.build();

Consider subclassing DefaultLogFormatter and overriding formatBody if you only need to customise the logged HTTP body.

Acknowledgements

Thanks to @nwholloway and @hdpe for the original implementation.

License

CI