ProxyExchange discards all incoming request headers when making a request with a body.

[ericyanush]

Affects: spring-cloud-gateway-webflux:3.1.1

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Setup
Define an MVC RestController that accepts a ProxyExchange as an argument to a request handler method, and use the ProxyExchange object to issue a POST request (or any request that contains a body) to an upstream service, using a body created (or manipulated) in the request handler method.

Expected Behaviour
The ProxyExchange forwards the original request headers, minus filtered sensitive headers, and Content related headers in the upstream request.

Observed Behaviour
The ProxyExchange discards all original incoming headers, appending only the X-Forwarded-For and X-Forwarded-Proto headers. This behaviour is in contrast to the behaviour observed when using a ProxyExchange object to make requests to upstream services that do not contain bodies (GET, OPTIONS, etc).

[sandipchitale]

Any update on this?

[NadChel]

Could you share your controller please?

[PreAgile]

Opened #4159 with a fix and a regression test, scoped to the WebFlux variant since the webmvc one already handles incoming headers on every method.