membphis commented on a change in pull request #3883:
URL: https://github.com/apache/apisix/pull/3883#discussion_r607152904



##########
File path: apisix/error_handler.lua
##########
@@ -0,0 +1,53 @@
+--
+-- 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.
+--
+local ngx = ngx
+
+
+local html_5xx = [[
+<!DOCTYPE html>
+<html>
+<head>
+<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
+<meta content="utf-8" http-equiv="encoding">
+<title>Error</title>
+<style>
+    body {
+        width: 35em;
+        margin: 0 auto;
+        font-family: Tahoma, Verdana, Arial, sans-serif;
+    }
+</style>
+</head>
+<body>
+<h1>An error occurred.</h1>
+<p>Sorry, the page you are looking for is currently unavailable.<br/>
+Please try again later.</p>
+<p>If you are the system administrator of this resource then you should check
+the <a 
href="https://github.com/apache/apisix/blob/master/conf/config-default.yaml#L135";>error
 log
+</a> for details.</p>
+<p>If you need any help, click <a href="https://apisix.apache.org/";>need 
help</a>.</em></p>
+<p><em>Faithfully yours, <a 
href="https://apisix.apache.org/";>APISIX</a>.</em></p>
+</body>
+</html>
+]]
+
+
+return function()

Review comment:
       Here is an example:
   
   ```lua
   local _M = {}
   
   local function 5xx_error()
       ... 
   end 
   
   local function 4xx_error()
       ... 
   end 
   
   function _M.error_page(status)
       if ... then
           return 5xx_error()
       end
   
       if ... then
           return 4xx_error()
       end
   
       ... ...
   end
   
   return _M
   ```




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