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@ semisol
2024-04-10 01:12:11Why this is happening
This happens due to an invalid real IP header.
You are most likely using
X-Forwarded-Foras the real IP header. Strfry expects the real IP header to contain just an IP, but theX-Forwarded-Forheader is a list of IPs, with every proxy adding the IP of where it got the request from.If a client specifies an X-Forwarded-For header, like
X-Forwarded-For: 1.1.1.1, your proxy will add the remote IP, like this:X-Forwarded-For: 1.1.1.1, 127.0.0.1When you use$proxy_add_x_forwarded_forin Nginx, this is what it is doing: appending the remote IP to the header.Strfry tries parsing
1.1.1.1, 127.0.0.1as an IP address, fails, and throws an exception.How to fix it
If you are using Caddy, just switch to
X-Real-IP.If you are using Nginx, you can add a real IP header like so, and switch to using it:
proxy_set_header X-Real-IP $remote_addr;You can also disable the real IP header, but this will cause problems if you use a write filter script or look at the logs.