1. The problem I’m having:
I am trying to set up a reverse proxy that maps the original path to a slightly altered path on the server, i.e. I want all requests to api.server.com/data to be redirected to server2.com/core-api/data. I have been trying to follow similar examples on here but have not had success yet.
This is relevant part of my Caddyfile:
api.server.com {
rewrite * /core-api{uri}
reverse_proxy server2.com
}
Clearly it’s stuck redirecting infinitely from the browser network view and the logs but I would expect new requests to go to server2.com, not back to api.server.com. I’m clearly missing something!
Thank you for your help.
2. Error messages and/or full log output:
Logs are truncated to meet post character limits but basically this pattern repeats a dozen times before the browser gives up and stops redirecting.
2024/01/09 18:22:49.127 DEBUG http.handlers.rewrite rewrote request {"request": {"remote_ip": "127.0.0.1", "remote_port": "51922", "client_ip": "127.0.0.1", "proto": "HTTP/3.0", "method": "GET", "host": "api.server.com", "uri": "/data", "headers": {"Upgrade-Insecure-Requests": ["1"], "Sec-Fetch-Mode": ["navigate"], "Accept-Language": ["en-US,en;q=0.5"], "User-Agent": ["Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0"], "Alt-Used": ["api.server.com"], "Sec-Fetch-Dest": ["document"], "Sec-Fetch-Site": ["none"], "Sec-Fetch-User": ["?1"], "Pragma": ["no-cache"], "Priority": ["u=1"], "Accept-Encoding": ["gzip, deflate, br"], "Cache-Control": ["no-cache"], "Accept": ["text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"]}, "tls": {"resumed": false, "version": 772, "cipher_suite": 4865, "proto": "h3", "server_name": "api.server.com"}}, "method": "GET", "uri": "/core-api/data"}
2024/01/09 18:22:49.127 DEBUG http.handlers.reverse_proxy selected upstream {"dial": "server2.com:80", "total_upstreams": 1}
2024/01/09 18:22:49.128 DEBUG http.handlers.reverse_proxy upstream roundtrip {"upstream": "server2.com:80", "duration": 0.001142334, "request": {"remote_ip": "127.0.0.1", "remote_port": "51922", "client_ip": "127.0.0.1", "proto": "HTTP/3.0", "method": "GET", "host": "api.server.com", "uri": "/core-api/data", "headers": {"Accept-Language": ["en-US,en;q=0.5"], "Sec-Fetch-Site": ["none"], "Priority": ["u=1"], "Accept-Encoding": ["gzip, deflate, br"], "Sec-Fetch-Mode": ["navigate"], "Alt-Used": ["api.server.com"], "Sec-Fetch-Dest": ["document"], "Pragma": ["no-cache"], "Accept": ["text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"], "X-Forwarded-Host": ["api.server.com"], "User-Agent": ["Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0"], "Cache-Control": ["no-cache"], "X-Forwarded-For": ["127.0.0.1"], "Upgrade-Insecure-Requests": ["1"], "Sec-Fetch-User": ["?1"], "X-Forwarded-Proto": ["https"]}, "tls": {"resumed": false, "version": 772, "cipher_suite": 4865, "proto": "h3", "server_name": "api.server.com"}}, "headers": {"Location": ["https://api.server.com/core-api/data"], "Server": ["Caddy"], "Date": ["Tue, 09 Jan 2024 18:22:49 GMT"], "Content-Length": ["0"]}, "status": 308}
2024/01/09 18:22:49.139 DEBUG http.handlers.rewrite rewrote request {"request": {"remote_ip": "127.0.0.1", "remote_port": "51922", "client_ip": "127.0.0.1", "proto": "HTTP/3.0", "method": "GET", "host": "api.server.com", "uri": "/core-api/data", "headers": {"Accept": ["text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"], "Sec-Fetch-User": ["?1"], "Pragma": ["no-cache"], "Cache-Control": ["no-cache"], "User-Agent": ["Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0"], "Sec-Fetch-Mode": ["navigate"], "Sec-Fetch-Site": ["none"], "Priority": ["u=1"], "Alt-Used": ["api.server.com"], "Accept-Language": ["en-US,en;q=0.5"], "Accept-Encoding": ["gzip, deflate, br"], "Upgrade-Insecure-Requests": ["1"], "Sec-Fetch-Dest": ["document"]}, "tls": {"resumed": false, "version": 772, "cipher_suite": 4865, "proto": "h3", "server_name": "api.server.com"}}, "method": "GET", "uri": "/core-api/core-api/data"}
2024/01/09 18:22:49.139 DEBUG http.handlers.reverse_proxy selected upstream {"dial": "server2.com:80", "total_upstreams": 1}
2024/01/09 18:22:49.141 DEBUG http.handlers.reverse_proxy upstream roundtrip {"upstream": "server2.com:80", "duration": 0.00173525, "request": {"remote_ip": "127.0.0.1", "remote_port": "51922", "client_ip": "127.0.0.1", "proto": "HTTP/3.0", "method": "GET", "host": "api.server.com", "uri": "/core-api/core-api/data", "headers": {"Priority": ["u=1"], "Upgrade-Insecure-Requests": ["1"], "User-Agent": ["Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0"], "Sec-Fetch-Mode": ["navigate"], "Sec-Fetch-Site": ["none"], "Accept-Encoding": ["gzip, deflate, br"], "X-Forwarded-For": ["127.0.0.1"], "Accept": ["text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"], "Pragma": ["no-cache"], "Accept-Language": ["en-US,en;q=0.5"], "X-Forwarded-Proto": ["https"], "Cache-Control": ["no-cache"], "Alt-Used": ["api.server.com"], "X-Forwarded-Host": ["api.server.com"], "Sec-Fetch-User": ["?1"], "Sec-Fetch-Dest": ["document"]}, "tls": {"resumed": false, "version": 772, "cipher_suite": 4865, "proto": "h3", "server_name": "api.server.com"}}, "headers": {"Location": ["https://api.server.com/core-api/core-api/data"], "Server": ["Caddy"], "Date": ["Tue, 09 Jan 2024 18:22:49 GMT"], "Content-Length": ["0"]}, "status": 308}
3. Caddy version:
v2.7.6 h1:w0NymbG2m9PcvKWsrXO6EEkY9Ru4FJK8uQbYcev1p3A=
4. How I installed and ran Caddy:
brew install caddy
a. System environment:
OSX, not in a container
b. Command:
caddy run
c. Service/unit/compose file:
d. My complete Caddy config:
api.server.com {
rewrite * /core-api{uri}
reverse_proxy server2.com
}