diff --git a/src/java.base/share/classes/java/net/HttpURLConnection.java b/src/java.base/share/classes/java/net/HttpURLConnection.java
--- a/src/java.base/share/classes/java/net/HttpURLConnection.java
+++ b/src/java.base/share/classes/java/net/HttpURLConnection.java
@@ -358,7 +358,7 @@
 
     /* valid HTTP methods */
     private static final String[] methods = {
-        "GET", "POST", "HEAD", "OPTIONS", "PUT", "DELETE", "TRACE"
+        "GET", "POST", "HEAD", "OPTIONS", "PUT", "DELETE", "TRACE", "PATCH"
     };
 
     /**