Support feign.Request as interface method parameter

Hello everyone,

In one of our project, we would like to use feign as a proxy client. As such, we need multiple dynamic resolutions:

• http method
• headers
• url
• query
• etc.

I searched a bit but did not find a satisfying solution using feign. What I would love is to have the possibility to use a feign.Request as parameter:

public interface MyClient {
    feign.Response request(feign.Request request);
}

This kind of method quickly fails with Method MyClient#request(Request) not annotated with HTTP method type (ex. GET, POST).

Another thing I tried is to dynamically resolve the http method:

public interface MyClient {
    @RequestLine("{method}")
    feign.Response request(@Param("method") HttpMethod method, ...);
}

but this also quickly fails with RequestLine annotation didn't start with an HTTP verb on method.

Start by locating the Feign method validation that emits “not annotated with HTTP method type” and the RequestLine parsing that rejects a dynamic verb. Read how interface methods become requests, then determine the expected behavior for a method accepting feign.Request. Done means the interface example can execute dynamic HTTP methods, headers, URLs, and queries without those validation errors.