Index: src/protocol/http/org/apache/jmeter/protocol/http/sampler/HTTPHC4Impl.java
===================================================================
--- src/protocol/http/org/apache/jmeter/protocol/http/sampler/HTTPHC4Impl.java	(revision 1831018)
+++ src/protocol/http/org/apache/jmeter/protocol/http/sampler/HTTPHC4Impl.java	(working copy)
@@ -42,6 +42,7 @@
 import java.util.function.Predicate;
 import java.util.regex.Pattern;
 import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
 
 import javax.security.auth.Subject;
 
@@ -51,6 +52,7 @@
 import org.apache.http.HttpClientConnection;
 import org.apache.http.HttpConnectionMetrics;
 import org.apache.http.HttpEntity;
+import org.apache.http.HttpEntityEnclosingRequest;
 import org.apache.http.HttpException;
 import org.apache.http.HttpHost;
 import org.apache.http.HttpRequest;
@@ -95,6 +97,7 @@
 import org.apache.http.conn.socket.ConnectionSocketFactory;
 import org.apache.http.conn.socket.PlainConnectionSocketFactory;
 import org.apache.http.cookie.CookieSpecProvider;
+import org.apache.http.entity.ByteArrayEntity;
 import org.apache.http.entity.ContentType;
 import org.apache.http.entity.FileEntity;
 import org.apache.http.entity.StringEntity;
@@ -213,8 +216,25 @@
         }
     };
 
+    private static final class GzipHttpRequestInterceptor implements HttpRequestInterceptor {
+        @Override
+        public void process(HttpRequest request, HttpContext context) throws HttpException, IOException {
+            if(request instanceof HttpEntityEnclosingRequest) {
+                Header header = request.getFirstHeader("Content-Encoding");
+                if(header != null && "gzip".equals(header.getValue())) {
+                    HttpEntityEnclosingRequest enclosingRequest = (HttpEntityEnclosingRequest) request;
+                    HttpEntity entity = enclosingRequest.getEntity();
+                    ByteArrayOutputStream out = new ByteArrayOutputStream();
+                    try (GZIPOutputStream gzipOS = new GZIPOutputStream(out)) {
+                        entity.writeTo(gzipOS);
+                    }
+                    enclosingRequest.setEntity(new ByteArrayEntity(out.toByteArray()));
+                }
+            }
+        }
+    }
     private static final class PreemptiveAuthRequestInterceptor implements HttpRequestInterceptor {
-        //@Override
+        @Override
         public void process(HttpRequest request, HttpContext context) throws HttpException, IOException {
             HttpClientContext localContext = HttpClientContext.adapt(context);
             AuthManager authManager = (AuthManager) localContext.getAttribute(CONTEXT_ATTRIBUTE_AUTH_MANAGER);
@@ -375,7 +395,7 @@
 
     private static final String DIGEST_PARAMETERS = DigestParameters.VARIABLE_NAME;
 
-    
+    private static final HttpRequestInterceptor GZIP_REQUEST_INTERCEPTOR = new GzipHttpRequestInterceptor();
     private static final HttpRequestInterceptor PREEMPTIVE_AUTH_INTERCEPTOR = new PreemptiveAuthRequestInterceptor();
 
     // see  https://stackoverflow.com/questions/26166469/measure-bandwidth-usage-with-apache-httpcomponents-httpclient
@@ -1051,6 +1071,7 @@
                 }
                 builder.setDefaultCredentialsProvider(credsProvider);
             }
+            builder.addInterceptorFirst(GZIP_REQUEST_INTERCEPTOR);
             builder.disableContentCompression().addInterceptorLast(RESPONSE_CONTENT_ENCODING);
             if(BASIC_AUTH_PREEMPTIVE) {
                 builder.addInterceptorFirst(PREEMPTIVE_AUTH_INTERCEPTOR);