Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/6031#discussion_r190248244
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/router/PathPattern.java
---
@@ -0,0 +1,179 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.rest.handler.router;
+
+import java.util.Map;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * This is adopted and simplified code from tv.cntt:netty-router library.
For more information check {@link Router}.
+ *
+ * <p>The pattern can contain constants or placeholders, example:
+ * {@code constant1/:placeholder1/constant2/:*}.
+ *
+ * <p>{@code :*} is a special placeholder to catch the rest of the path
+ * (may include slashes). If exists, it must appear at the end of the path.
+ *
+ * <p>The pattern must not contain query, example:
+ * {@code constant1/constant2?foo=bar}.
+ *
+ * <p>The pattern will be broken to tokens, example:
+ * {@code ["constant1", ":variable", "constant2", ":*"]}
+ */
+final class PathPattern {
--- End diff --
Maybe add reference to
https://github.com/sinetja/netty-router/blob/2.2.0/src/main/java/io/netty/handler/codec/http/router/PathPattern.java
---
