Return IP address of connecting client

[nadholio]

Hi All,

I am releatively new to HAProxy but trying to do some new things.

I am looking for a way to use the monitor-uri or another way which I can do a URL check from the remote client to the server, and have the IP address of the client returned. Similar to running “curl ifconfig.co” or using whatismyip.

Example:
Monitor-URI setup as below
monitor-uri /status

Run command
curl url.com: THE URL Shortener - Free, Custom URLs

Returned
HTTP/1.0 200 OK
Cache-Control: no-cache
Connection: close
Content-Type: text/html

I would like the hosting server returning the 200 response to include the public address of the client the curl was run from.

Any way to achieve this would be appreciated.

[lukastribus]

You can find 2 different solutions here:

Reflect back to the client their IP address

At Discourse we often need to know what IP address a user might be coming from to diagnose their problems. We just got rid of a droplet that was serving this function and replaced it with a Lua function running inside HAProxy: reflectip = function(applet) applet:set_status(200) applet:add_header("cache-control", "none") applet:add_header("content-type", "text/plain") applet:start_response() applet:send(applet.f:src()) end core.register_service("reflectip", "http", reflectip)