If your server signature is on. Turning off your server signature is generally a good thought from a security point of view.
shows signature as below
Server: Apache/2.4.6 (CentOS) OpenSSL/1.0.1e-fips PHP/5.6.33
To Turn off Signature
Open Apaches configuration file ie. httpd.conf or apache.conf and search for ServerSignature.
If you find it, edit it to :
ServerSignature Off ServerTokens Prod
If you don’t find it, just add these two lines at the end of the file.
Note that, after you modify the configuration file, you must restart the Apache server.