Merge pull request AsyncHttpClient#438 from gerdriesselmann/patch-3

Support DEFLATE compression for Netty provider

Author: Stephane Landelle

providers/netty/src/main/java/org/asynchttpclient/providers/netty/request/NettyRequests.java

@@ -107,7 +107,7 @@ else if (uri.getRawQuery() != null)
 
         if (method != HttpMethod.CONNECT) {
             if (config.isCompressionEnabled()) {
-                headers.put(HttpHeaders.Names.ACCEPT_ENCODING, HttpHeaders.Values.GZIP);
+                headers.put(HttpHeaders.Names.ACCEPT_ENCODING, HttpHeaders.Values.GZIP + "," + HttpHeaders.Values.DEFLATE);
             }
         } else {
             List<String> auth = request.getHeaders().get(HttpHeaders.Names.PROXY_AUTHORIZATION);