Search not working anymore

[Gummibando]

Search does not work anymore.

While the categories "tag cloud"
(via https://userstyles.org/api/v1/categories/site)
gets loaded in the Stylish extension interface,

a search
(via https://userstyles.org/api/v1/styles/subcategory?search=fritz&per_page=22&country=us&page=1)
returns a fatal error in the JSON result set.
{"error":"fatal error"}

[Gummibando]

Huh, it gets weirder.
If you open the search link above from the GitHub webpage (e.g. just clicking the search link above), you get a valid JSON result set.
If you open the link in a new window, you get an error 500 and the "fatal error" message in the JSON result.
After a bit of tinkering (Debookee, ftw.) it looks like the request needs a referrer.

This is the HTTP request if the link is invoked from the Stylish extension, e.g. a search is performed in Stylish (no referrer in the HTTP request):

13:30:16	https://userstyles.org/api/v1/styles/subcategory?search=fritz&per_page=22&country=us&page=1	GET	500 	application/json	23 B
	:authority: userstyles.org				
	accept: application/json, text/javascript, */*; q=0.01				
	user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.1.2 Safari/605.1.15				
	accept-language: en-us				
	accept-encoding: br, gzip, deflate				
	dnt: 1

Result: Error 500, error message in JSON result.

This is the HTTP request if the link is invoked from the userstyles.org web page, e.g. a search is performed there (referrer https:/userstyles.org… in the HTTP request):

13:29:01	https://userstyles.org/api/v1/styles/search?search=fritz&page=1	GET	200 	application/json	13.6 kB
	:authority: userstyles.org				
	accept: */*				
	referer: https://userstyles.org/styles/browse?search_terms=fritz				
	dnt: 1				
	user-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.1.2 Safari/605.1.15				
	accept-language: en-us				
	accept-encoding: br, gzip, deflate

Result: Correct JSON result set.
The same happens when the link is opened from GitHub, e.g. clicking the search link in the first comment (HTTP referrer https://github.com…).

[Gummibando]

Yep, it looks like ANY referrer will do, it just has to be be included.