Allow serving static files on Google App Engine second generation PHP flex runtime - alternate

nginx-app.conf

# This file is used by App Engine flex environment PHP runtime by name convention nginx-app.conf:
# https://cloud.google.com/appengine/docs/flexible/php/runtime#customize_nginx

# App Engine rewrites everything to index.php$uri, this prevents us to catch
# anything else with `location` block, so the hack is to catch it with another
# rewrite that lets us handle in our own `location ~ ^/myapp` below
# (https://github.com/GoogleCloudPlatform/buildpacks/blob/ff2ea2737a928087dcec192bf3ce103dc356ad5e/pkg/nginx/nginx.go#L93)
rewrite ^/index.php(.*)$ /myapp$1;

# If you need to handle any php file, not just index.php
# This is mostly copied from https://github.com/GoogleCloudPlatform/buildpacks/blob/ff2ea2737a928087dcec192bf3ce103dc356ad5e/pkg/nginx/nginx.go#L95
# with the difference being that we remove our hack /myapp prefix
location ~ ^/myapp(.*)\.php$ {
	error_log stderr;

	fastcgi_pass    fast_cgi_app;
	fastcgi_buffering       off;
	fastcgi_request_buffering       off;
	fastcgi_cache   off;
	fastcgi_store   off;
	fastcgi_intercept_errors        off;

	fastcgi_split_path_info ^/myapp(.+\.php)(.*)$;
	fastcgi_index   $fastcgi_script_name;

	fastcgi_param   QUERY_STRING    $query_string;
	fastcgi_param   REQUEST_METHOD  $request_method;
	fastcgi_param   CONTENT_TYPE    $content_type;
	fastcgi_param   CONTENT_LENGTH  $content_length;

	fastcgi_param   SCRIPT_NAME     $fastcgi_script_name;
	fastcgi_param   SCRIPT_FILENAME $document_root$fastcgi_script_name;
	fastcgi_param   PATH_INFO       $fastcgi_path_info;
	fastcgi_param   REQUEST_URI     $request_uri;
	fastcgi_param   DOCUMENT_URI    $fastcgi_script_name;
	fastcgi_param   DOCUMENT_ROOT   $document_root;
	fastcgi_param   SERVER_PROTOCOL $server_protocol;
	fastcgi_param   REQUEST_SCHEME  $scheme;
	if ($http_x_forwarded_proto = 'https') {
		set $https_setting 'on';
	}
	fastcgi_param   HTTPS   $https_setting if_not_empty;

	fastcgi_param   GATEWAY_INTERFACE       CGI/1.1;
	fastcgi_param   REMOTE_ADDR     $remote_addr;
	fastcgi_param   REMOTE_PORT     $remote_port;
	fastcgi_param   REMOTE_HOST     $remote_addr;
	fastcgi_param   REMOTE_USER     $remote_user;
	fastcgi_param   SERVER_ADDR     $server_addr;
	fastcgi_param   SERVER_PORT     $server_port;
	fastcgi_param   SERVER_NAME     $server_name;
	fastcgi_param X_FORWARDED_FOR $proxy_add_x_forwarded_for;
	fastcgi_param X_FORWARDED_HOST $http_x_forwarded_host;
	fastcgi_param X_FORWARDED_PROTO $http_x_forwarded_proto;
	fastcgi_param FORWARDED $http_forwarded;
}

# Handle this our way first because we want to try serving a file if it matches,
# otherwise go back to app engine's default index.php `location` block.
location ~ ^/myapp(.*)$ {
    # We can't send to /index.php$1 directly here because that would be caught
    # by our `rewrite ^/index.php` causing infinite rewrites. So instead send
    # this to the @fallback `location` below where we can do a final rewrite
    # with the `last` keyword.
    try_files $1 @fallback;
}
location @fallback {
    rewrite ^/myapp(.*)$ /index.php$1 last;
}