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));