By default, the Nginx version displayed when you query HTTP headers generated by the Nginx server.
For instance below config taken from Docker Nginx 1.18 Stable image:
# /etc/nginx/nginx.conf
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
#tcp_nopush on;
keepalive_timeout 65;
#gzip on;
include /etc/nginx/conf.d/*.conf;
}
If we send request to the server we get a headers like below:
$ http --headers localhost:8080
HTTP/1.1 200 OK
Accept-Ranges: bytes
Connection: keep-alive
Content-Length: 612
Content-Type: text/html
Date: Fri, 30 Oct 2020 15:05:27 GMT
ETag: "5e9eea60-264"
Last-Modified: Tue, 21 Apr 2020 12:43:12 GMT
Server: nginx/1.18.0
I used httpie but you can use curl as well:
$ curl -I localhost:8080
Hiding
In order to hide Nginx server header info we need to add server_tokens off; to the config file.
# /etc/nginx/nginx.conf
user nginx;
worker_processes 1;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include /etc/nginx/mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx/access.log main;
sendfile on;
#tcp_nopush on;
keepalive_timeout 65;
#gzip on;
# Here we add
server_tokens off;
include /etc/nginx/conf.d/*.conf;
}
Now if you send request you will see:
HTTP/1.1 200 OK
Accept-Ranges: bytes
Connection: keep-alive
Content-Length: 612
Content-Type: text/html
Date: Fri, 30 Oct 2020 15:05:27 GMT
ETag: "5e9eea60-264"
Last-Modified: Tue, 21 Apr 2020 12:43:12 GMT
Server: nginx
INFO
We can set server_tokens in http, server, or location context only.
All done!
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