How to enable keepalive in nginx upstream

nginx upstream turns on keepalive

upstream tomcat {
 server ops-coffee.cn:8080;
 keepalive 1024;
}

server {
 location / {
  proxy_http_version 1.1;
  proxy_set_header Connection "";

  proxy_pass http://tomcat;
 }
}

nginx will be used as a reverse proxy in most cases in the project, such as nginx followed by tomcat, nginx followed by php, etc. At this time, we enable keepalive between nginx and back-end services to reduce resource consumption caused by frequently creating TCP connections. The configuration is as above

keepalive: Specify the maximum number of connections that each nginxworker can maintain is 1024, which is not set by default. , that is, keepalive does not take effect when nginx is used as a client

proxy_http_version 1.1: Turning on keepalive requires the HTTP protocol version to be HTTP 1.1

proxy_set_header Connection "": In order to be compatible with old protocols and prevent Connection in the http header Keepalive failure caused by close requires timely clearing of the Connection

in the HTTP header.

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