Is there a very long link (URL) shortener service?

Question

Link Shortening

Sometimes there is a need to share a link to a page of a certain site, which is formed as a result of a request using the post method. Most often this is a page with the result of a search for something. The question of why webmasters do not always use a more suitable GET request, we will leave aside (all the more so, sometimes the choice may be dictated by objective reasons).
There are services that can turn a page with a post form into a url: frmget and GET to POST Converter (GET Forms URLs) (former gettopost.com) (the result can be corrected manually if necessary).
The problem is that you end up with rather long links (maybe 1000 or more characters) that refuse to shorten all the shorteners I know.
This is not the longest link generated by one of the services:

I wanted to find services that shorten such long urls (at least with a ceiling of 20 thousand characters, although, as follows from the article , there is no official limit on the length of the url).

Answer 1

rx.hu/

Answer 2

There is
bitly.com/ and analogues

Answer 3

www.boutell.com/newfaq/misc/urllength.html
more than 4k characters is not supported by many