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When an HTTP server returns "404 not found", it indicates that at least part of it is still running. For this reason, it can be convenient for application administrators to be able to consider code 404 as valid, but for a server which does not want to participate to load balancing anymore. This is useful to seamlessly exclude a server from a farm without acting on the load balancer. For instance, let's consider that haproxy checks for the "/alive" file. To enable load balancing on a server, the admin would simply do : # touch /var/www/alive And to disable the server, he would simply do : # rm /var/www/alive Another immediate gain from doing this is that it is now possible to send NOTICE messages instead of ALERT messages when a server is first disable, then goes down. This provides a graceful shutdown method. To enable this behaviour, specify "http-check disable-on-404" in the backend. |
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| .. | ||
| acl.h | ||
| backend.h | ||
| buffers.h | ||
| capture.h | ||
| client.h | ||
| fd.h | ||
| global.h | ||
| hdr_idx.h | ||
| httperr.h | ||
| log.h | ||
| polling.h | ||
| proto_http.h | ||
| protocols.h | ||
| proxy.h | ||
| queue.h | ||
| server.h | ||
| session.h | ||
| task.h | ||
| template.h | ||