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Face Book Plugin Development 404 and 405 errors

When I was developing my first test Face Book plugin I had the following errors that annoyed me for a few hours until I figured out my mistake.

404 Error:

Error while loading page from [App name]
Received HTTP error code 404 while loading http://www.mywebserver.com/facebookapp

There are still a few kinks Facebook and the makers of test are trying to iron out. We appreciate your patience as we try to fix these issues. Your problem has been logged - if it persists, please come back in a few days. Thanks

405 Error:

Error while loading page from [App name]
Received HTTP error code 405 while loading http://www.mywebserver.com/facebookapp

There are still a few kinks Facebook and the makers of test are trying to iron out. We appreciate your patience as we try to fix these issues. Your problem has been logged - if it persists, please come back in a few days. Thanks

Solution

I figured out that the solution for this error is simple as I used to fill in the Canvas Callback URL in facebook application page the url as: (http://www.mywebserver.com/facebookapp) while I must end the url with a forward slash to be: (http://www.mywebserver.com/facebookapp/)

After adding the last forward slash my application started working.

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