Проверьте у себя может:
# curl "https://example.org/$(head -c 9999 /dev/zero |tr '\0' 'a')"
curl: (52) Empty reply from server
> GET /aaaaaaa..................
< HTTP/1.1 414 Request-URI Too Large
< Server: nginx
< Date: Thu, 26 Dec 2019 13:18:42 GMT
< Content-Type: text/html
< Content-Length: 170
< Connection: close
<
<html>
<head><title>414 Request-URI Too Large</title></head>
<body>
<center><h1>414 Request-URI Too Large</h1></center>
<hr><center>nginx</center>