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

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

Start with TraceProxyRequestHelper.debug and SimpleHostRoutingFilter, then compare the handling in FormBodyWrapperFilter and ProxyRequestHelper.shouldDebugBody. Reproduce the issue with a POST or PUT using Content-Type text/plain and confirm that the backend receives the request body instead of timing out.