Very strange issue with redirect

Hey I can see your products on the page. I am having a similar issue with my cart and checkout pages when I am not logged in, I only see partial info and the coupon and returning customer links don’t work. If I am logged in the site I can see it all fine and the links worked.

Can you tell me how you fixed your issue?

The direct link and site link doesn’t work for me. I see the page is cached, so that may be related.

Yes the problem is direct link is not working
If you click on top menu second item then same link is opened but then works

It’s not related of the cache if I turn it off then doesn’t work too
When I check with query monitor when direct link is hit page is redirected to post_type product
But when direct link is hit it’s redirected to shop page

It’s very strange

No thats not the case. If I click that link I still have no results.

Yes you are correct
Very strange, I have disabled the cache and now the problem is same
On direct hit there are no products on click there are.

It’s strange. If you copy/paste the link it works too. I wonder if its related to the special chars in the URL and your server combined.

First I think the problem comes from the chars and have changed it to Latin chars but same issue is happening.

I have other woocommerce installation on which shop page is working with Cyrillic chars

have you done other tests, such as different themes etc?

Yes,
I have set default theme and disabled all plugins except woocommerce
And situation is same

Does not really make any sense if you’re using latin chars, and there is no caching.

if you compare the URLs, there is one slight difference. The working one, the entities are lower case. The broken one is uppercase.

Bad link: https://dl.dropboxusercontent.com/s/33g03xvm8m7s5je/2016-03-14%20at%2016.30.png?dl=0

Good link: https://dl.dropboxusercontent.com/s/4o6u2mm6jntwbo0/2016-03-14%20at%2016.31.png?dl=0

Thanks for the help
Yes this is the problem

Probably when I write url then browser encode url by default with uppercases but in the database is with lowercase and this is causing the issue

Solution is simply like

function unFocus_insensitivity() {
    if (preg_match('/[A-ZА-Я]/', $_SERVER['REQUEST_URI'])) {
        $_SERVER['REQUEST_URI'] = strtolower($_SERVER['REQUEST_URI']);
        $_SERVER['PATH_INFO']   = strtolower($_SERVER['PATH_INFO']);
    }
}
add_action('init', 'unFocus_insensitivity');

And thanks once again

This may be something which should be reported to WP trac – I’m not knowledgeable enough with these types of domains to know if its a core bug or server issue.