[GitHub] [apisix] tangtangsara commented on issue #4171: bug: log-util print response header connection always close, is apisix use short connection to upstream ?

[GitBox <gi...@apache.org>]

tangtangsara commented on issue #4171:
URL: https://github.com/apache/apisix/issues/4171#issuecomment-830645498


   
   
   
   > Hi, I reproduced your example and apisix does not actively modify the header connection.
   > 
   > my route
   > 
   > ```json
   > {
   >     "update_time": 1619856904,
   >     "id": "1",
   >     "upstream": {
   >         "hash_on": "vars",
   >         "pass_host": "pass",
   >         "scheme": "http",
   >         "nodes": {
   >             "127.0.0.1:1980": 1
   >         },
   >         "type": "roundrobin"
   >     },
   >     "uri": "/*",
   >     "create_time": 1619856904,
   >     "status": 1,
   >     "enable_websocket": true,
   >     "priority": 0
   > }
   > ```
   > 
   > `127.0.0.1:1980` is a nginx server, the nginx.conf is https://github.com/apache/apisix/blob/master/benchmark/server/conf/nginx.conf
   > 
   > here is my request and response
   > 
   > ```
   > GET
   > 127.0.0.1:9080/hello
   > 16:21:22.653
   > Pretty
   > Raw
   > Request Headers:
   > Connection:"keep-alive"
   > cache-control:"no-cache"
   > Postman-Token:"7d3d220d-e0d1-4958-89b4-5f3fa842f244"
   > User-Agent:"PostmanRuntime/7.6.0"
   > Accept:"*/*"
   > Host:"127.0.0.1:9080"
   > accept-encoding:"gzip, deflate"
   > Response Headers:
   > Content-Type:"text/plain; charset=utf-8"
   > Transfer-Encoding:"chunked"
   > Connection:"keep-alive"
   > Date:"Sat, 01 May 2021 08:21:22 GMT"
   > Server:"APISIX/2.5"
   > Response Body:Infinity
   > ```
   @tzssangglass 
   您这个请求和响应是 postman (客户端 或浏览器) -> apisix之间的, 他们之间的响应我这里也是没问题的
   我提交的问题是apisix -> upstream之间的,  
   
   tomcat不会有什么问题, 因为之前通过nginx代理响应都是正常的.
   而且我通过抓包,确认了 apisix 发送请求给tomcat时
    设置nginx配置 set $upstream_connection         '';   代表  无connection头, tomcat响应没有connection 头
    设置nginx配置 set $upstream_connection         'keep-alive';   代表强制启用 keep-alive, tomcat响应有connection:keepalive
   这都是正确的 
   
   @Firstsawyou 日志里面记录的响应头,一定是有问题的, 没有打印出正确的tomcat的响应头.
   更重要的是, 因为这个问题引起了我的担心 , 担心 apisix和tomcat之间的连接,即便是tomcat响应了keepalive,但仍然如日志打印的connection:close一直使用短连接.
   高并发的情况会大量创建连接
   


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