vary being ignored

[blubbb]

.htaccess
<IfModule LiteSpeed>
RewriteEngine On
CacheLookup public on
RewriteCond %{HTTP:Accept-Language} ^de [NC]
RewriteRule .* - [E=Cache-Control:vary=de]
</IfModule>

test.php
<?php
header('Content-type: image/svg+xml');
header('X-LiteSpeed-Cache-Control: public,max-age=30'); // In the actual application max-age is a calculated value
?>

Testing using curl:
curl -v "https://www.example.com/test.php" -H "Accept-Language: en"

first call:

x-litespeed-cache: miss

later calls:

x-litespeed-cache: hit

That is good!


curl -v "https://www.example.com/test.php" -H "Accept-Language: de"

first call:

x-litespeed-cache: miss

later calls:

x-litespeed-cache: miss

That is bad. How do I fix this?

 

[serpent_driver]

RewriteCond %{HTTP:Accept-Language} ^de [NC]
RewriteRule .* - [E=Cache-Control:vary=%{ENV:LSCACHE_VARY_VALUE}+de]

or

RewriteCond %{HTTP:Accept-Language} de|it|en|es|fr [NC]
RewriteRule .* - [E=Cache-Control:vary=%{ENV:LSCACHE_VARY_VALUE}+lang]

 

[blubbb]

Neither works. Same result.

 

[serpent_driver]

Did you try the second too code or only the first?

 

[serpent_driver]

Or try this:

RewriteCond %{HTTP:Accept-Language} (.+) [NC]
RewriteRule .* - [E=Cache-Control:vary=%{ENV:LSCACHE_VARY_VALUE}+lang:%1]

 

[blubbb]

After the first one didn't work, I tried the second, too, of course.
You know what is strange? If I remove the Content-type header, it works (my first attempt does, too). But I need that header. My script creates an image.

 

[serpent_driver]

Test it in browser or complete request headers in curl like a browser sends these headers.

 

[blubbb]

Your last suggestion does not work either. Even "en" gets only cache misses.

 

[serpent_driver]

Unfortunately I cannot qualify your work. But I can tell you that the code I showed works and not just for me. This code is standard.

 

[blubbb]

In Chrome I get cache misses, too.

 

[blubbb]

Have you tried it yourself with the Content-type header?

 

[AndreyPopov]

@blubbb may be try use cookie if your script accept language cookie?

https://docs.litespeedtech.com/lscache/devguide/advanced/#vary-cookies

X-LiteSpeed-Vary: cookie=my_cookie,cookie=my_cookie2


P.S. in my opinion - use vary value in Rewrite rules only when:
- different View of page
- device/UA do not accept cookies

 

[blubbb]

With this header it works:
header('Content-Type: text/html');

With this header it does not:
header('Content-Type: image/svg+xml');

Nothing else changed. I checked this several times. What is going on here?

 

[AndreyPopov]

it may be because: LSCache store cached page as static HTML file with header('Content-Type: text/html');

you can open saved cached file and see that it's always Content-Type: text/html

 

[blubbb]

If I flush the cache and access the "de" version first and then the "en" version, LiteSpeed serves me the "de" version. It seems to ignore the vary during the first access.
The cached file contains a string "content-type: image/svg+xml2".

Could someone please try the minimum code example I posted? Maybe my webspace provider has some kind of misconfiguration?

 

[AndreyPopov]

learn how you lscache save file.

- cached url
- route path
- _lscache_vary cookie (if sets) (for different languanges (de) cookie _lscache_vary must be sets to language=de )
- vary value (if sets by rewrite rules - in this example ismobile)
- other cookies
- lscache tags



that's why try use
X-LiteSpeed-Vary: cookie="language=de" for de
and
X-LiteSpeed-Vary: cookie="" for en

 

[blubbb]

Luckily, I have access to those cache files.

These are the two examples. I ONLY changed the Content-Type in the .php file. Nothing else.

Both files were created after calling the identical:
curl -v "https://www.example.com/test.php" -H "Accept-Language: de"

 

[AndreyPopov]

<?php
header('Content-type: image/svg+xml');
header('X-LiteSpeed-Cache-Control: public,max-age=30'); 
if (strpos($_SERVER['HTTP_ACCEPT_LANGUAGE'], 'de') !== FALSE) {
    header('X-LiteSpeed-Vary: cookie="language=de"');
    }
?>

??????

 

[serpent_driver]

With this header it works:
header('Content-Type: text/html');

With this header it does not:
header('Content-Type: image/svg+xml');

image/svg+xml is a static source and is therefore not cached by LScache. Static sources are cached by the browser.

 

[blubbb]

No, it is not. The image is generated by my script upon each call.