Android Retrofit + Rxjava：如何获得对non200代码的响应？

Question

This is how my request looks like:

ApiService apiService = retrofit.create(ApiService.class);
Observable<Response<UserUpdateResponse>> response = apiService.updateUser(Utils.getHeader(), object);

response.subscribeOn(Schedulers.newThread())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(this::onSuccessUpdate,
                    this::onErr,
                    this::hideDialogLoading);

It's supposed to return 'code':'205' 'msg':'successfully update' . But when server response any code 201,202 (anything not 200) it will go to error.

Here is the Error.

java.net.ProtocolException: HTTP 205 had non-zero Content-Length: 121

So how do I prevent it from error, or how do I get error body? Thank you!.

Answer 1

HTTP response codes have a predefined definition and some have requirements that they must fullfill to be considered a valid HTTP payload. You cannot redefine what these codes mean for your application and expect well-implemented clients to accept it.

Looking specifically at HTTP 205 - Reset Content , which has the following requirement:

Since the 205 status code implies that no additional content will be provided, a server MUST NOT generate a payload in a 205 response.

Generally applications will just return HTTP 200 for all requests and include application-specific error codes in the payload. What you're doing does not make much sense.

Answer 2

So technically, I can get response 2xx. The problem was that server response body in response code 205 that suppose to be null ( https://tools.ietf.org/html/rfc7231#section-6.3.6 ). So after set body null on server, android side works fine.