Remove explicit Content-Encoding header

Author: arturobernalg

httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientDeflateCompressionExample.java

@@ -73,7 +73,6 @@ public static void main(final String[] args) throws Exception {
 
             final SimpleHttpRequest request = SimpleRequestBuilder
                     .post("https://httpbin.org/post")
-                    .addHeader("Content-Encoding", "deflate")
                     .build();
 
             final Future<Message<HttpResponse, String>> future = client.execute(

httpclient5/src/test/java/org/apache/hc/client5/http/examples/AsyncClientDeflatePostExample.java

@@ -82,7 +82,6 @@ public static void main(final String[] args) throws Exception {
 
             /* ------------- build request ---------------------- */
             final SimpleHttpRequest req = SimpleRequestBuilder.post("https://httpbin.org/post")
-                    .addHeader("Content-Encoding", "deflate")
                     .build();
 
             final Future<Message<HttpResponse, String>> f = client.execute(