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We can follow the below steps to remove the Server header from HTTP response for PHP 8.x apps on Linux App Service (which uses Nginx server) -
We will be following the steps described here to change the configurations of Nginx: https://azureossd.github.io/2021/09/02/php-8-rewrite-rule/index.html
#create a copy of the default configurations
cp /etc/nginx/sites-available/default /home/site/default#add the following properties in the copied file /home/site/default
server_tokens off;
more_clear_headers Server;
#create a startup script /home/site/start.sh (feel free to rename it)
#!/bin/bash
cp /home/site/default /etc/nginx/sites-available/default
service nginx reload
#Add a startup command on the WebApp and wait for it to restart.
#We can using the cURL command:
[-i, --include Include protocol response headers in the output]