GzipRequestInterceptor not working

[chonamdoo]

// okhttpclient setting

    OkHttpClient statisticsApiClient = new OkHttpClient();
    statisticsApiClient.setReadTimeout(20000, TimeUnit.MILLISECONDS);
    statisticsApiClient.setConnectTimeout(20000, TimeUnit.MILLISECONDS);
    statisticsApiClient.interceptors().add(new GzipRequestInterceptor());
   RestAdapter restStatisticsAdapter = new  RestAdapter.Builder().setEndpoint("http://xxx,xxxx,com").setClient(new OkClient(statisticsApiClient))
            .setLogLevel(RestAdapter.LogLevel.FULL).build();

    // rest api
    @Headers("Cache-Control: max-age=5000")
    @POST("/api/v1/log")
    @FormUrlEncoded
    Observable<NewBaseData> postStatisticsData(@Field(ServerConst.STATISTICS_DATA) String statistics_data);


 // gzip
 public class GzipRequestInterceptor implements Interceptor {
@Override public Response intercept(Chain chain) throws IOException {
    Request originalRequest = chain.request();
    if (originalRequest.body() == null || originalRequest.header("Content-Encoding") != null) {
        return chain.proceed(originalRequest);
    }
    Request compressedRequest = originalRequest.newBuilder()
            .header("Content-Encoding", "gzip")
            .method(originalRequest.method(), forceContentLength(gzip(originalRequest.body())))
            .build();
    return chain.proceed(compressedRequest);
}

/** https://github.com/square/okhttp/issues/350 */
private RequestBody forceContentLength(final RequestBody requestBody) throws IOException {
    final Buffer buffer = new Buffer();
    requestBody.writeTo(buffer);
    return new RequestBody() {
        @Override
        public MediaType contentType() {
            return requestBody.contentType();
        }

        @Override
        public long contentLength() {
            return buffer.size();
        }

        @Override
        public void writeTo(BufferedSink sink) throws IOException {
            sink.write(buffer.snapshot());
        }
    };
}

private RequestBody gzip(final RequestBody body) {
    return new RequestBody() {
        @Override public MediaType contentType() {
            return body.contentType();
        }

        @Override public long contentLength() {
            return -1; // We don't know the compressed length in advance!
        }

        @Override public void writeTo(BufferedSink sink) throws IOException {
            BufferedSink gzipSink = Okio.buffer(new GzipSink(sink));
            body.writeTo(gzipSink);
            gzipSink.close();
        }
    };
}

[JakeWharton]

Duplicated from square/okhttp#1986