Major For security reasons, it's sometimes desired to NOT include the openresty version number in response headers and error response bodies.
For example take note of '1.13.6.2' in the Server header and response body:
HTTP/1.1 504 Gateway Time-out
Server: openresty/1.13.6.2
Date: Thu, 28 Feb 2019 16:20:43 GMT
Content-Type: text/html
Content-Length: 189
Connection: keep-alive
<html>
<head><title>504 Gateway Time-out</title></head>
<body bgcolor="white">
<center><h1>504 Gateway Time-out</h1></center>
<hr><center>openresty/1.13.6.2</center>
</body>
</html>
To prevent this, you can set `server_tokens off;` in the nginx conf in the http block.
Results in:
HTTP/1.1 504 Gateway Time-out
Date: Thu, 28 Feb 2019 16:09:40 GMT
Content-Type: text/html
Content-Length: 180
Connection: keep-alive
<html>
<head><title>504 Gateway Time-out</title></head>
<body bgcolor="white">
<center><h1>504 Gateway Time-out</h1></center>
<hr><center>openresty</center>
</body>
</html>
Ideally this would be set via SERVER_TOKENS=off or some such environment variable.
