Android Picasso library, How to add authentication headers?

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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

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