Configure nginx with two php-fpm fastcgi_pass locations - php

Question

For wordpress site using nginx + php-fpm I'm interested in applying a longer fastcgi_read_timeout directive just to /wp-admin directory to avoid timeouts for time intensive admin tasks.
The only issue with the code sample below is when I visit http://webpage.org/wp-admin I get 404. When I visit http://webpage.org/wp-admin/index.php the page posts.
Using nginx add-header directive to help me debug I've been able to determine that when visiting http://webpage.org/wp-admin nginx chooses location ~ .php$ over location ^~ /wp-admin.
Any ideas on how to resolve this? Thanks
location ^/wp-admin/.*.(php|phps)$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
fastcgi_keep_conn on;
fastcgi_read_timeout 120;
}
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
fastcgi_keep_conn on;
}

Answer 1

I tested change to try_files directive suggested by Keenan Lawrence which resolved issue for me.
Helpful explanation of nginx try_files directive can be found here: how can i make this try_files directive work?
To troubleshoot this problem I used add_header directive, placing one directive in each location. Then with Chrome browser I opened Developer Tools, clicked on Network tab, clicked on Record Network Log, then loaded the test wp-admin/ page. There is a Header tab that you can then click on to verify where your page loaded. Also see https://serverfault.com/questions/404626/how-to-output-variable-in-nginx-log-for-debugging
Working configuration below that includes header directives for debug.
location ~* ^/wp-admin/.*.(php|phps)$ {
add_header X-debug-message "This page processed from location ^~ /wp-admin . uri = $uri ." always;
try_files $uri $uri/ =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
fastcgi_keep_conn on;
fastcgi_read_timeout 120;
}
location ~ \.php$ {
add_header X-debug-message "This page processed from location ~ \.php uri = $uri ." always;
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root/$fastcgi_script_name;
fastcgi_keep_conn on;
}