HaProxy capture client hostname

Help!
1

I want to capture client hostname into HaProxy log. Using the help at
HAProxy Log Customization

I am able to customize log format. But not able to capture client hostname (I mean requesting client hostname) . Any idea how to capture that? Thanks in advance.

Regards.
Nimesh

2

Where or how exactly would you like to get the clients hostname? It’s not like the client is sending it in the HTTP request.

If you are thinking about doing a reverse lookup of the client’s IP address, this cannot work; because logging needs to be fast, you cannot wait for a external DNS lookup to log a request.

I would recommend to do this not in haproxy, but in some kind of post processing script/automation.

3

Thanks lukastribus, you are absolutely right. My purpose is to authenticate client based on their requesting hostnames. Actually multiple clients are sending auth requests from a single shared IP, So, authentication based on source IP will not works. Moreover, clients are using Python Selenium to make proxy requests which is not supports user:pass@proxyip:port format.

Any other way of solution idea?