Attempting to delete an email/subscriber from the list times out

[Znuff]

Description

When attempting to delete a subscriber from the list, the request hangs indefinitely.

The HTTP request seems to trigger, but never completes.

There are no error messages in the server log. This request doesn't even trigger a slow log from PHP's side.

The modal will wait forever, because on the browser side the request will never finish.

Screenshots

Additional information

No response

[picocodes]

Hi @Znuff,

• Open your browser's console when deleting and check if any error shows up.
• Also click on the network tab and check the response returned from the server.

[Znuff]

There is no error in the console.

The request never finishes in the browser, even after 10+ minutes.

If you examine the access log on the server side, the server does decide to give up (with a 408 in the case of our nginx).

It's good to note that if you actually execute the Request via cURL (Right Click > Copy as cURL), the email address is deleted as expected.

[picocodes]

That's strange. Does this happen when you try a different browser? Also, does it only happen when deleting subscribers or is it also the case when editing subscribers?

[Znuff]

Happens in Firefox and Chrome.

Only when deleting. Modifying works fine.

Seems I have it pinned down to HTTP/3 being enabled. Disabling HTTP/3 server-side seems to make it work.

Explains why running it via curl works (as my curl binary doesn't have support for it).

[picocodes]

Thanks. I think we can fix it with this:- https://developer.wordpress.org/rest-api/using-the-rest-api/global-parameters/#_method-or-x-http-method-override-header

I'll make the necessary changes then let you know later today.

[picocodes]

Upon further inspection it seems this is already implemented in core. I'll look more into why HTTP/3 fails then get back to you.