504 error but have unlimited execution time

WP Static Site Generators WP2Static
#1

Setup

WP2Static 7.2
WP2Static Add-on: Zip Deployment 1.0.1
PHP max_execution_time: Unlimited
PHP memory_limit: 1073741824 (1GB)
Uploads directory writable: Writable
PHP version: 8.0.25
cURL extension loaded: Yes
WordPress Permalinks Compatible: Yes

I also disable some of the detections:

add_filter( 'wp2static_detect_sitemaps', '__return_false' );
add_filter( 'wp2static_detect_posts_pagination', '__return_false' );
add_filter( 'wp2static_detect_archives', '__return_false' );
add_filter( 'wp2static_detect_categories', '__return_false' );
add_filter( 'wp2static_detect_category_pagination', '__return_false' );
add_filter( 'wp2static_detect_authors', '__return_false' );
add_filter( 'wp2static_detect_authors_pagination', '__return_false' );

and I exclude some urls via the ‘wp2static_modify_initial_crawl_list’ filter (pages I know generate 404) and a number of urls of image and pdf files that are failing (though I do not know why).

The error alert box message is:

504 error code returned from server.
Please check your server's error logs or try increasing your max_execution_time limit in PHP if this consistently fails after the same duration.
More information of the error may be logged in your browser's console.

with browser console:

Gateway Time-out admin.php:212:17
504 Gateway Time-out - The server didn't respond in time.

What’s a good way to debug this?
How can I find what url it was trying to get?

#2

You should first check the logs of your HTTP server to check if there 504 response has been logged there. It should happen on a request to the /wp-admin/admin-ajax.php path.

In my case, I actually had only 200 on the HTTP server logs. The problem was I had a Load Balancer as intermediary, and it was the one setting a stricter timeout of 60s, and returning the 504 status code. After changing the timeout in the Load Balancer, I got this working.

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