Android Picasso library, How to add authentication headers?

Question

I have tried setting a custom OkHttpClient with a custom Authenticator, however as the doc says: "Responds to authentication challenges from the remote web or proxy server." I have to make 2 requests for each image, and that is not ideal.

Is there a request interceptor like Retrofit does? Or am I missing something in the OkHttpClient?

I'm using the latest versions:

compile 'com.squareup.picasso:picasso:2.3.2'
compile 'com.squareup.okhttp:okhttp:2.0.+'
compile 'com.squareup.okhttp:okhttp-urlconnection:2.0.+'
compile 'com.squareup.okio:okio:1.0.0'

Thanks!

Answer 1

Since Picasso 2.5.0 OkHttpDownloader class has been changed, assuming you are using OkHttp3 (and so picasso2-okhttp3-downloader), so you have to do something like this:

OkHttpClient client = new OkHttpClient.Builder()
        .addInterceptor(new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {
                Request newRequest = chain.request().newBuilder()
                        .addHeader("X-TOKEN", "VAL")
                        .build();
                return chain.proceed(newRequest);
            }
        })
        .build();

Picasso picasso = new Picasso.Builder(context)
        .downloader(new OkHttp3Downloader(client))
        .build();

Source: https://github.com/square/picasso/issues/900