Question How to disable nginx caching status 302?

[Redsector]

Server operating system version

Ubuntu 20.04.6 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.51 Update #1

I have a website that "detects" browser language when is invoked directly and redirect accordingly to the proper language.
I have found out that if I "Enable nginx caching" it will cache this redirect. What happens is taht any following request from anyone/anywhere else, will be redirected to the "first" user language even if is different.

To debug I use:
curl -Ls -H 'Accept-Language: XX' -I https://www.website.tld
and I see x-cache-status: HIT except the first time.

I've tried adding some directives but none seems to works.

proxy_cache_valid 302 0;
proxy_no_cache $http_response_status 302;
proxy_cache_bypass $http_response_status 302;

Is there any way to avoid this caching behavior?

 

[Peter Debik]

You can try to add this directive block to additional Nginx directives:

if ($request_uri ~* "(/)") {
 set $skip_cache 1;
 set $skip_reason "${skip_reason}-request_uri";
}

Not tested, theoretical solution

 

[Redsector]

Hi @Peter Debik,
I've tried your suggestion but it still caches.

Here is a request with language "us"

HTTP/2 302
server: nginx
date: Tue, 18 Apr 2023 17:12:49 GMT
content-type: text/html; charset=iso-8859-1
content-length: 225
location: https://XXX/de/index.html
cache-control: max-age=600
expires: Tue, 18 Apr 2023 17:22:42 GMT
x-cache-status: HIT

 

[Peter Debik]

The location string is different in your test. There it is
/de/index.html
but in the directive it is
/
The question here is what the original request is that is sent to your server. Is it addressing / or is it directly addressing /de/index.html?

 

[Redsector]

This redirect is working only if someone request the "domain", without any page, else is disregarded.
First I change from http to https, then i redirect according to language to /LANGUAGE/index.html

 

[Peter Debik]

I think your above example only shows that the /de/index.html page is cached, not that the / path is cached. Have you also added a no-cache policy to the index page of the website so that the browser does not cache the request? Else it is well possible that your redirect is not initialized by a cached Nginx page, but by the browser.

For details on how to exlude specific pages from Nginx caching I found this guide that in my opinion covers it all:

Exclude a Page or Cookie from Nginx Server Caching

If you're building projects for your clients, or you're managing a website that has some complex functionality, you may find that you need a page to be excluded from the cache for it to work correctly.

gridpane.com

 

[RobertDavies]

I have a website that "detects" browser language when is invoked directly and redirect accordingly to the proper language.
I have found out that if I "Enable nginx caching" it will cache this redirect. What happens is taht any following request from anyone/anywhere else, will be redirected to the "first" user language even if is different.

To debug I use:
curl -Ls -H 'Accept-Language: XX' -I https://www.website.tld
and I see x-cache-status: HIT except the first time.

I've tried adding some directives but none seems to works.

proxy_cache_valid 302 0;
proxy_no_cache $http_response_status 302;
proxy_cache_bypass $http_response_status 302;

Is there any way to avoid this caching behavior?

It must be very convenient.

 

[Redsector]

Hi Peter, thanks for the assistance.
the issue is that the redirect is not for a "page". Technically speaking is for an URL.
If I do exclude the destination page (after the redirect) the redirect is still cached. If I do exclude "/", then the whole website is excluded.