[Escalated to WPML Developers team] Wpml_switch_language causing Cloudflare error 520

I'm still waiting for Cloudways to increase the header maximum. It's not a quick setting apparently. I will update here once it's done.

Hi Marcel,

Cloudways changed this NGINX setting to allow larger HTTP headers by the server:
large_client_header_buffers 16 128k;

Now it works, but only if I disable proxying via Cloudflare by changing the A record in the Cloudflare DNS. I am now waiting for Cloudflare Support to see why they still reject the page.

I was able to make a HAR file with Cloudflare completely by-passed, and one with Cloudflare enabled. You'll find them here: hidden link

I'd appreciate it if you'd take a look. Because I noticed something strange. This section below is in the HAR files 300 times!

{"name": "set-cookie", "value": "wp-wpml_current_language=de; expires=Thu, 09-Nov-2023 07:31:31 GMT; Max-Age=86400; path=/; secure"}

That can't be good, right? It may be the root of this issue. I think it has something to do with the code we discussed, and executing that code a lot of times on the same page. It looks like it sets a new cookie each time, causing a huge header.

Cloudflare may get back to me saying that they accept a fixed max header, and can't change that. Which would mean the header must be limited on our end.

Kind regards,
Arno

Hi Marcel,

Thanks again. To make sure I understand:

1. The hook will be fixed in WPML so it doesn't set so many cookies?

2. For now, as a quick fix, I need to replace this:

do_action('wpml_switch_language', $current_language_code);

by this:

if ($current_language_code == 'de') {
switch_to_locale('de_DE');
}

Should I do that site-wide, or only where I have an issue now, and change it back to the WPML hook once it is fixed?

Hi Marcel,

Is this issue fixed, and in which version?

Thanks,
Arno