--- a/src/java.net.http/share/classes/jdk/internal/net/http/Stream.java	Wed May 02 10:47:16 2018 +0200
+++ b/src/java.net.http/share/classes/jdk/internal/net/http/Stream.java	Wed May 02 02:36:17 2018 -0700
@@ -614,7 +614,7 @@
         if (query != null) {
             path += "?" + query;
         }
-        hdrs.setHeader(":path", path);
+        hdrs.setHeader(":path", Utils.encode(path));
     }
 
     HttpHeadersImpl getRequestPseudoHeaders() {