java - Retrofit 不调用 failure 并且 response.code() 是 400

Question

我确定我在这里做的事情有问题。即使我得到的代码是 400，Retrofit 也不会失败。

        AuthenticationService authService = retrofit.create(AuthenticationService.class);
        Call<ValidateTokenResponseMessage> request = authService.validateToken(token);
        request.enqueue(new Callback<ValidateTokenResponseMessage>() {
            @Override
            public void onResponse(Call<ValidateTokenResponseMessage> call, retrofit2.Response<ValidateTokenResponseMessage> response) {
            // When I try to put a breakpoint here I can see that response.code() is 400. 
                ValidateTokenResponseMessage body = response.body();
                if (!body.getValidToken()) {
                    // do success 
                }
            }

            @Override
            public void onFailure(Call<ValidateTokenResponseMessage> call, Throwable t) {
                // do failure
            }
        });

Answer 1

Callback.onFailure仅在缺少互联网连接或无效 https 等异常情况下被调用。

Invoked when a network exception occurred talking to the server or when an unexpected exception occurred creating the request or processing the response.

要检查错误，您必须使用 Response.isSuccessful()

Returns true if code() is in the range [200..300).