spring-cloud/spring-cloud-netflix

Only request bodies with content-type multipart/* and application/x-www-form-urlencoded work

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#3418 opened on Mar 14, 2019

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enhancementhelp wanted

Description

Make a request through zuul using a POST or PUT verb with a content-type that is not multipart/* or application/x-www-form-urlencoded`

When Zuul makes the request to the backend, it won't include the request body.

The reason is that the original request body is consumed in org.springframework.cloud.netflix.zuul.filters.TraceProxyRequestHelper.debug(String, String, MultiValueMap<String, String>, MultiValueMap<String, String>, InputStream) leaving no request body to consume when org.springframework.cloud.netflix.zuul.filters.route.SimpleHostRoutingFilter actually sends the request.

Requests of content-type application/x-www-form-urlencoded work because org.springframework.cloud.netflix.zuul.filters.pre.FormBodyWrapperFilter gets the body. Requests of type multipart/* work because org.springframework.cloud.netflix.zuul.filters.ProxyRequestHelper.shouldDebugBody(RequestContext) explicitly excludes them.

To reproduce the issue, just make a request through zuul with a Content-Type of text/plain, for example, and you'll always get a time out error as the backend server will keep waiting for response body that it will never get.

I believe this issue was originally reported at https://github.com/spring-cloud/spring-cloud-netflix/issues/2610

Contributor guide

Tech stack
javaspring
Domain
backendapi
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
JavaSpring Cloud Netflix basicsHTTP content types
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the body consumption in TraceProxyRequestHelper.debug() and ensure the original request body is preserved for SimpleHostRoutingFilter. Check the FormBodyWrapperFilter and ProxyRequestHelper.shouldDebugBody() to understand the current workaround for multipart and form urlencoded. Refer to issue #2610. Consider implementing a fix that caches the body before debug consumption or modifies the debug method to not consume the body.