A simple facebook app gets Method Post is not allowed error

I tried a very simple helloworld example facebook app. Basically I have a webpage, only contains one file index.php, which only contains one line: echo "helloworld". I have registered this app as an facebook app, configured the setting, canvas url to http://mydomain/..

I can load the page mydomain/index.php. However, when I load the page http://apps.facebook.com/appid, I got the following error: The requested method POST is not allowed for the URL ...

I checked apache config, there is no or settings to prevent POST method.

Apache error log ad access log does not say anything.

Do you have any clue how to 开发者_如何学编程fix this?

Thanks for your kind help!

The first request a Facebook app makes is a POST request. It seems your server is not accepting them. A common problem is having something like:

http://mydomain.com/index.html 

Instead of

http://mydomain.com/index.php

Either way check your HTTP logs you will probably see an error ( possibly 405 ) with more details.