Spring Boot Actuator's Trace does a good job of capturing input/output HTTP params, headers, users, etc. I'd like to expand it to also capture the body of the HTTP response, that way I can have a full view of what is coming in and going out of the the web layer. Looking at the TraceProperties, doesn't look like there is a way to configure response body capturing. Is there a "safe" way to capture the response body without messing up whatever character stream it is sending back?
How to include JSON response body in Spring Boot Actuator's Trace?
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3 Answers
From one of the spring maintainers:
Tracing the request and response body has never been supported out of the box. Support for tracing parameters was dropped as, when the request is POSTed form data, it requires reading the entire request body.
With a webflux reactive stack, it is possible to capture http request and response body using spring-cloud-gateway and inject them into actuator httptrace by defining a custom HttpTraceWebFilter.
See full associated code at https://gist.github.com/gberche-orange/06c26477a313df9d19d20a4e115f079f
This requires quite a bit of duplication, hopefully springboot team will help reduce this duplication, see related https://github.com/spring-projects/spring-boot/issues/23907
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