--- a/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/HttpRequestBuilderImpl.java	Sun Nov 05 17:32:13 2017 +0000
+++ b/src/jdk.incubator.httpclient/share/classes/jdk/incubator/http/HttpRequestBuilderImpl.java	Sun Nov 05 21:19:55 2017 +0000
@@ -187,6 +187,8 @@
         requireNonNull(method);
         if (method.equals(""))
             throw newIAE("illegal method <empty string>");
+        if (method.equals("CONNECT"))
+            throw newIAE("method CONNECT is not supported");
         return method0(method, requireNonNull(body));
     }