Retrofit: how to parse GZIP'd response without Content-Encoding: gzip header

Question

I\'m trying to process a server response which is GZIP\'d. The response comes with a header

Content-Type: application/x-gzip

but does not

Answer 1

I figured it out. The idea is to add a custom interceptor which will take the not-yet-unzipped response, and unzip it 'manually' - do the same thing that OkHttp would do automatically based on Content-Encoding header, but without requiring that header.

is like dis:

    OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder()
            .addInterceptor(new UnzippingInterceptor());
    OkHttpClient client = clientBuilder.build();

And the Interceptor is like dis:

private class UnzippingInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Response response = chain.proceed(chain.request());
        return unzip(response);
    }
}

And the unzip function is like dis:

    // copied from okhttp3.internal.http.HttpEngine (because is private)
private Response unzip(final Response response) throws IOException {

    if (response.body() == null) {
        return response;
    }

    GzipSource responseBody = new GzipSource(response.body().source());
    Headers strippedHeaders = response.headers().newBuilder()
            .removeAll("Content-Encoding")
            .removeAll("Content-Length")
            .build();
    return response.newBuilder()
            .headers(strippedHeaders)
            .body(new RealResponseBody(strippedHeaders, Okio.buffer(responseBody)))
            .build();
}