On Thu, Jul 27, 2017 at 11:54 PM, Mark Staudinger <[email protected]> wrote:
> Hi Folks, > > I'm trying to export the server_name as a response header or variable for > logging purposes ( %s in the log format ). > > Is there a way to access this string in a manner similar to one of these > methods? I've tried the following without success (usually with a "unknown > fetch method %s". > > http-response set-var(txn.servername) %s > or > http-response set-var(txn.servername) %[server_name] > You can use this: http-response set-header X-Backend-Server-Name %s When using http-response set-header or http-response add-header, the value argument is a "log format expression," which understands log variables. By contrast, http-response set-variable expects a "standard HAProxy expression formed by a sample fetch followed by some converters," so it doesn't have access to log variables, only fetches. There's a srv_id layer 4 fetch that can get the server's ID, but there's not a sample fetch for the server name.
