We're using HAProxy as a load balancer at the moment, and it regularly makes requests to the downstream boxes to make sure they're alive using an OPTIONS request:
OPTIONS /index.html HTTP/1.0
I'm working with getting nginx set up as a reverse proxy with caching (using ncache). For some reason, nginx is returning a 405 when an OPTIONS request comes in:
192.168.1.10 - - [22/Oct/2008:16:36:21 -0700] "OPTIONS /index.html HTTP/1.0" 405 325 "-" "-" 192.168.1.10
When hitting the downstream webserver directly, I get a proper 200 response. My question is: how to you make nginx pass that response along to HAProxy, or, how can I set the response in the nginx.conf?
I'm probably late, but I had the same problem, and found two solutions to it.
First is tricking Nginx that a 405 status is actually a 200 OK and then proxy_pass it to your HAProxy like this:
error_page 405 =200 @405; location @405 { root /; proxy_pass http://yourproxy:8080; }
The second solution is just to catch the OPTIONS request and build a response for those requests:
location / { if ($request_method = OPTIONS ) { add_header Content-Length 0; add_header Content-Type text/plain; return 200; } }
Just choose which one suits you better.
I wrote this in a blog post where you can find more details.
In the httpchk option, you can specify the HTTP method like this:
httpchk GET http://example.com/check.php
You can also use POST, or a plain URI like /. I have it check PHP, since PHP runs external to Nginx.
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