do not use 'deflate' in unit test. It is not supported for requests

hc5/src/test/java/feign/hc5/AsyncApacheHttp5ClientTest.java

@@ -243,7 +243,7 @@ public void headerMapWithHeaderAnnotations() throws Exception {
     api.headerMapWithHeaderAnnotations(headerMap);
 
     // header map should be additive for headers provided by annotations
-    assertThat(server.takeRequest()).hasHeaders(entry("Content-Encoding", Arrays.asList("deflate")),
+    assertThat(server.takeRequest()).hasHeaders(entry("Content-Encoding", Arrays.asList("gzip")),
         entry("Custom-Header", Arrays.asList("fooValue")));
 
     server.enqueue(new MockResponse());
@@ -256,7 +256,7 @@ public void headerMapWithHeaderAnnotations() throws Exception {
      * valid to have more than one value for a header.
      */
     assertThat(server.takeRequest()).hasHeaders(
-        entry("Content-Encoding", Arrays.asList("deflate", "overrideFromMap")),
+        entry("Content-Encoding", Arrays.asList("gzip", "overrideFromMap")),
         entry("Custom-Header", Arrays.asList("fooValue")));
 
     checkCFCompletedSoon(cf);
@@ -880,7 +880,7 @@ CompletableFuture<Void> expandArray(@Param(value = "clock",
     CompletableFuture<Void> headerMap(@HeaderMap Map<String, Object> headerMap);
 
     @RequestLine("GET /")
-    @Headers("Content-Encoding: deflate")
+    @Headers("Content-Encoding: gzip")
     CompletableFuture<Void> headerMapWithHeaderAnnotations(@HeaderMap Map<String, Object> headerMap);
 
     @RequestLine("GET /")