Bug 65600

Problem seems to be related to mod_proxy since latest update, something to do with handling unix socket paths, its showing repeated in access log. eg:

apache49_1  | 127.0.0.1 - - [28/Sep/2021:01:02:52 +0000] "GET /usr/local/apache2/htdocs/unix:/run/sock/nginx.sock|http://localhost/usr/local/apache2/htdocs/unix:/run/sock/nginx.sock|http:/localhost/usr/local/apache2/htdocs/unix:/run/sock/nginx.sock|http:/localhost/usr/local/apache2/htdocs/unix:/run/sock/nginx.sock|http:/localhost/usr/local/apache2/htdocs/unix:/run/sock/nginx.sock|http:/localhost/usr/local/apache2/htdocs/unix:/run/sock/nginx.sock|http:/localhost:8049/index.html HTTP/1.1" 403 199

This can cause path to overflow

Repoduce

Setup Apache with default configuration, and enable mod_rewrite and mod_proxy.

Use .htaccess file to Rewrite requests to http over unix socket.

See example repo here with example of working and broken using docker versions of apache 2.4.48 and 2.4.49.

https://github.com/cseufert/apache-proxy-test