William Dauchy a9dd901143 MINOR: proxy: add option idle-close-on-response ... Avoid closing idle connections if a soft stop is in progress. By default, idle connections will be closed during a soft stop. In some environments, a client talking to the proxy may have prepared some idle connections in order to send requests later. If there is no proper retry on write errors, this can result in errors while haproxy is reloading. Even though a proper implementation should retry on connection/write errors, this option was introduced to support back compat with haproxy < v2.4. Indeed before v2.4, we were waiting for a last request to be able to add a "connection: close" header and advice the client to close the connection. In a real life example, this behavior was seen in AWS using the ALB in front of a haproxy. The end result was ALB sending 502 during haproxy reloads. This patch was tested on haproxy v2.4, with a regular reload on the process, and a constant trend of requests coming in. Before the patch, we see regular 502 returned to the client; when activating the option, the 502 disappear. This patch should help fixing github issue #1506. In order to unblock some v2.3 to v2.4 migraton, this patch should be backported up to v2.4 branch. Signed-off-by: William Dauchy <wdauchy@gmail.com> [wt: minor edits to the doc to mention other options to care about] Signed-off-by: Willy Tarreau <w@1wt.eu>		2022-01-06 09:09:51 +01:00
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haproxy	MINOR: proxy: add option idle-close-on-response	2022-01-06 09:09:51 +01:00
import	REORG: ebtree: split structures into their own file ebtree-t.h	2021-10-07 01:41:14 +02:00