Re: A patch for haproxy (HTTP-ECV)

From: Willy Tarreau <>
Date: Tue, 24 Feb 2009 07:30:36 +0100


On Tue, Feb 24, 2009 at 11:04:05AM +0800, FinalBSD wrote:
> Hi Willy,
> I updated this patch, rewrite it and fixed the err. can you check it
> again?
> syntax:
> expect status 200
> expect ! status 200
> expect string ABCD
> expect ! string ABCD
> expect rstatus ^2
> expect ! rstatus ^2
> expect rstring A..D
> expect ! rstring A..D
> rstatus, rstring means use regex to do the http_check.
> By default, it's case sensitive, if we need case insensitive, I think
> 'iexpect' keyword should be added.

we could proceed like with the ACLs, with "-i" between "expect" and "string" for instance.

I'm now wondering if we could re-use the ACL framework for this. Maybe it's not too hard to adapt, and then we could directly reuse all the available keywords and tests. There is already a "status" match in the ACLs. We can match many things in headers (eg: expect a specific Location: or Cache-control: header). We could add the content matching to the ACLs for completeness. We could add the "body_reg" and "body_str" matches to complete what is currently available.

For this to work, I think that we should simply fake a session and transaction when performing the health-checks, then parse the HTTP response just like we do with normal server responses, and then call the ACL framework.

What do you think ? Maybe as a first step, we should simply mimmick that based on your work and with very careful keyword and syntax selection, then later change that to rely on the ACL framework without changing the syntax. That would be really nice in my opinion.

Willy Received on 2009/02/24 07:30

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