Re: Changing HA Proxy return codes

[Matt]

On 7 April 2010 13:44, Holger Just  wrote:

> Hi Matt,
>
> On 2010-04-07 14:34, Matt wrote:
> > If I wanted to change the error return code submitted by haproxy (not
> > the backend server) is this possible? i.e. change haproxy to return a
> > 502 when it's going to return a 504?
>
> You could (ab)use the errorfile parameter and have haproxy send
> arbitrary data. Thus you could do something like this:
>
> errorfile 500 /etc/haproxy/errorfiles/503.http
> errorfile 502 /etc/haproxy/errorfiles/503.http
> errorfile 503 /etc/haproxy/errorfiles/503.http
> errorfile 504 /etc/haproxy/errorfiles/503.http
>
> and then have the file at /etc/haproxy/errorfiles/503.http contain
> something like this:
>
> HTTP/1.0 503 Service Unavailable
> Cache-Control: no-cache
> Connection: close
> Content-Type: text/html
> Content-Length: 329
>
>  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
> http://www.w3.org/1999/xhtml";>
> 
>  
>  Something is wrong
> 
> Something went wrong
> 
>
> Note that you should correctly re-calculate the Content-Length header
> (or leave it out) if you do any changes here.
>
> Cheers, don't know how I missed that in the manual.

Matt

Re: Changing HA Proxy return codes

[Holger Just]

Hi Matt,

On 2010-04-07 14:34, Matt wrote:
> If I wanted to change the error return code submitted by haproxy (not
> the backend server) is this possible? i.e. change haproxy to return a
> 502 when it's going to return a 504?

You could (ab)use the errorfile parameter and have haproxy send
arbitrary data. Thus you could do something like this:

errorfile 500 /etc/haproxy/errorfiles/503.http
errorfile 502 /etc/haproxy/errorfiles/503.http
errorfile 503 /etc/haproxy/errorfiles/503.http
errorfile 504 /etc/haproxy/errorfiles/503.http

and then have the file at /etc/haproxy/errorfiles/503.http contain
something like this:

HTTP/1.0 503 Service Unavailable
Cache-Control: no-cache
Connection: close
Content-Type: text/html
Content-Length: 329

http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
http://www.w3.org/1999/xhtml";>

  
  Something is wrong

Something went wrong


Note that you should correctly re-calculate the Content-Length header
(or leave it out) if you do any changes here.

--Holger

Changing HA Proxy return codes

[Matt]

I'm guessing the answer is no as i'm unable to find anything in the
documentation that suggests otherwise, but..

If I wanted to change the error return code submitted by haproxy (not the
backend server) is this possible? i.e. change haproxy to return a 502 when
it's going to return a 504?

I know the current return codes are correct as of
http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html - I could just do
with this short hack.

Thanks,

Matt