docs: document that SimpleClientHttpRequestFactory is not suitable for the WebMVC gateway#4203
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…n WebMVC gateway spring-cloudGH-3451: HttpURLConnection (used by SimpleClientHttpRequestFactory) throws exceptions on 4xx/5xx responses instead of returning the response, causing the gateway to forward a 500 instead of the actual downstream status. Added an "HTTP Client" section to how-it-works.adoc documenting: - Supported clients (Apache HC5, Jetty, JDK HttpClient) in priority order - explicit spring.http.clients.imperative.factory property - WARNING that SimpleClientHttpRequestFactory is unsupported and why Closes spring-cloudgh-3451 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Closes #3451
SimpleClientHttpRequestFactory(backed byjava.net.HttpURLConnection) is incompatible with Spring Cloud Gateway Server MVC.HttpURLConnectionthrows exceptions (e.g.FileNotFoundException,IOException) on 4xx/5xx responses rather than returning the response body, so the gateway cannot forward the downstream status to the client and falls back to a500 Internal Server Error.The fix is to use one of the supported HTTP client libraries instead. Added a new
[[gateway-http-client]]section tohow-it-works.adocthat documents:spring.http.clients.imperative.factoryproperty for explicit selectionWARNINGcallout explaining whySimpleClientHttpRequestFactoryfails and how to avoid itTest plan
spring.http.clients.imperative.factoryvalues (apache,jetty,jdk) match whatGatewayHttpClientEnvironmentPostProcessoraccepts