Apache 2.2.29_6. If defined LimitRequestBody in httpd.conf and sended POST request zero size (without any data), then returns to the browser "413 Request Entry Too Large", but in apache logs http code 200 (as if ok).
If LimitRequestBody removed from config then works fine.
Downgrade to 2.2.29_2 also helps.
Is this still an issue? If so, please provide some log output and the configuration options of your build.
Please also consider upgrading to 2.4, this port will be End-of-Life very soon and removed shortly after.