Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/6031#discussion_r190186599
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/rest/handler/router/RouterHandler.java
---
@@ -0,0 +1,109 @@
+/*
+ * 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 org.apache.flink.runtime.rest.handler.AbstractRestHandler;
+import org.apache.flink.runtime.rest.handler.util.HandlerUtils;
+import org.apache.flink.runtime.rest.messages.ErrorResponseBody;
+
+import org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandler;
+import
org.apache.flink.shaded.netty4.io.netty.channel.ChannelHandlerContext;
+import
org.apache.flink.shaded.netty4.io.netty.channel.ChannelInboundHandler;
+import org.apache.flink.shaded.netty4.io.netty.channel.ChannelPipeline;
+import
org.apache.flink.shaded.netty4.io.netty.channel.SimpleChannelInboundHandler;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.DefaultFullHttpResponse;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpHeaders;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpMethod;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpRequest;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpResponseStatus;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.HttpVersion;
+import
org.apache.flink.shaded.netty4.io.netty.handler.codec.http.QueryStringDecoder;
+
+import java.util.Map;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * This class replaces the standard error response to be identical with
those sent by the {@link AbstractRestHandler}.
--- End diff --
- I would add a comment that this was copied and simplified from
https://github.com/sinetja/netty-router/blob/1.10/src/main/java/io/netty/handler/codec/http/router/Handler.java
and
https://github.com/sinetja/netty-router/blob/1.10/src/main/java/io/netty/handler/codec/http/router/AbstractHandler.java
for future reference. That can be beneficial in the future.
- I would also copy the high-level comment from that class: `Inbound
handler that converts HttpRequest to RoutedRequest and passes RoutedRequest to
the matched handler` as found in the original Handler class.
---
