hi, first time / long time... i am wondering if the ability exists in HAProxy to reply to a HTTP proxy request with a reset (RST) if no backend server is available.
the scenario goes as such: i have a proxy pac file that assigns multiple proxies to all clients, and through the logic tree in the pac file, the proxies are assigned in a specific order. i have multiple sites with load balanced proxies, and the intention is to provide site failover, should a larger event occur like ISP issues that breaks internet access. with the pac file assigning all proxy VIPs to the client, should the default VIP not have an available backend server to fulfill the request, i would want to configure HAProxy to send a reset to the client, indicating that the next assigned proxy should be used. with site failover happening transparently, a user who would normally browse through the proxy/proxies at site1 would be automatically failed over and browse through the proxy/proxies at site2. if no servers were available in site2, then the next assigned proxy would be used and failures with RST replies would result in failovers until all assigned proxies are exhausted. the intention is not to provide / assign hundreds of proxies in the pac file, but to provide resiliency with a couple of sites serving as backups to each other, should an event warrant it. thank you, brendan kearney
