How to zip- compress HTTP request with Spring RestTemplate?

Question

How to gzip HTTP request, created by org.springframework.web.client.RestTemplate?

I am using Spring 4.2.6 with Spring

Answer 1

Further to the above answer from @TestoTestini, if we take advantage of Java 7+'s 'try-with-resources' syntax (since both ByteArrayOutputStream and GZIPOutputStream implement closeable() ) then we can shrink the getGzip function into the following:

private byte[] getGzip(byte[] body) throws IOException {

    try (ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
         GZIPOutputStream zipStream = new GZIPOutputStream(byteStream)) {
            zipStream.write(body);
        byte[] compressedData = byteStream.toByteArray();
        return compressedData;
    }

}

(I couldn't find a way of commenting on @TestoTestini's original answer and retaining the above code format, hence this Answer).