GET handler structure can't be named "open"

[MarkAnd1]

Hello!
Lately, I've been trying to get a simple HTTP server working on the esp32. I am using two GET handlers.
For some reason, I can't name the handler structure "open". If it is named open I get the error "httpd_resp_send_err: 404 Not Found - Nothing matches the given URI". If I name it for example "open1" it works.
What could be the reason for this?