config: fix setting postrequest config (apache#190)

PR apache#161 introduced `postrequest` config but there was no way to update that config other than updating the config file.
This PR fixes the behaviour. Also adds a log to highlight what HTTP method is used.

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

Tagging release 6.1.0 on branch master.

Tagging release 6.0.0 on branch master.

Tagging release 5.3.3 on branch master.

Tagging release 5.3.2 on branch master.

Tagging release 5.3.1 on branch master.

Tagging release 5.3.0 on branch 5.3.

Tagging release 5.2.0 on branch 5.2.

Tagging release 5.1.0 on branch 5.1.0.

Tagging release 5.0.0 on branch 5.0.