Retrofit - Intercept responses globally

Question

I'd like to intercept all responses received by the retrofit engine, and scan for HTTP error code, for example error 403.

I'm aware I can use the failure(RetrofitError error) callback of every request and check for 403's but I'd like to wrap the response globally.

I can see that request interception is possible, but I do not see a similar option for response.

Any suggestions?

Answer 1

I was able to accomplish that by adding an interceptor to the OkHttpClient that retrofit is using.

Kotlin + Retrofit 2.x

val clientBuilder = OkHttpClient.Builder()
clientBuilder.addInterceptor { chain ->
            val request = chain.request()
            val response = chain.proceed(request)
            if (response.code() == 403) {
                handleForbiddenResponse()
            }
            response
        }

Retrofit 2.x:

   OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder();
   clientBuilder.
            addInterceptor(new Interceptor() {
                @Override
                public Response intercept(Chain chain) throws IOException {
                   Request request = chain.request();
                   Response response = chain.proceed(request);
                   if (response.code() == 403) {
                         handleForbiddenResponse();
                   }
                   return response;
                }
            });


    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(API_BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .client(clientBuilder.build();)
            .build();

Retrofit 1.x:

public class ForbiddenInterceptor implements Interceptor {

    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request();
        Response response = chain.proceed(request);
        if (response.code() == 403) {
             handleForbiddenResponse();
        }
        return response;
    }
}



OkHttpClient okHttpClient = Utils.createUnsafeOkHttpClient();
okHttpClient.interceptors().add(new ForbiddenInterceptor());

RestAdapter.Builder restAdapterBuilder = new RestAdapter.Builder()
        .setEndpoint(API_BASE_URL)
        .setClient(new OkClient(okHttpClient));