nginx

HTTP/1.1 200 OK
Server: nginx
Date: Mon, 20 May 2024 21:47:31 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding

NTP
protocolversion: 3
stratum: 3
leap: 0
precision: -22
rootdelay: 0.0341491699219
rootdisp: 0.0289611816406
refid: 177152306
reftime: 3924451254.06
poll: 3

MySQL5.7.17

MySQL:
  Protocol Version: 10
  Version: 5.7.17
  Capabilities: 65535
  Server Language: 8
  Server Status: 2
  Extended Server Capabilities: 49663
  Authentication Plugin: mysql_native_password

PostgreSQL9.3.3 - 9.3.5

PostgreSQL
fe_sendauth: no password supplied

HTTP/1.1 200 OK
Content-Type: text/plain; charset=UTF-8
Content-Length: 2
Connection: keep-alive