avoid trim

no check null need it.

Author: arturobernalg

httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/ContentCompressionAsyncExec.java

@@ -141,7 +141,7 @@ public AsyncDataConsumer handleResponse(final HttpResponse rsp,
                     final HeaderElement[] el = BasicHeaderValueParser.INSTANCE
                             .parseElements(coding, new ParserCursor(0, coding.length()));
                     for (int i = el.length - 1; i >= 0; i--) {
-                        final String token = el[i].getName().trim().toLowerCase(Locale.ROOT);
+                        final String token = el[i].getName().toLowerCase(Locale.ROOT);
                         if ("identity".equals(token) || token.isEmpty()) {
                             continue;
                         }
@@ -186,7 +186,7 @@ public long getContentLength() {
 
             @Override
             public String getContentType() {
-                return original != null ? original.getContentType() : null;
+                return original.getContentType();
             }
 
             @Override