Android Retrofit Parameterized @Headers

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Besides using @Header parameter, I’d rather use RequestInterceptor to update all your request without changing your interface. Using something like:

RestAdapter.Builder builder = new RestAdapter.Builder()
    .setRequestInterceptor(new RequestInterceptor() {
        @Override
        public void intercept(RequestFacade request) {
            request.addHeader("Accept", "application/json;versions=1");
            if (isUserLoggedIn()) {
                request.addHeader("Authorization", getToken());
            }                    
        }
    });

p/s : If you are using Retrofit2, you should use Interceptor instead of RequestInterceptor

Since RequestInterceptor is not longer available in Retrofit 2.0

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