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Siverlight HTML5 Flash POST 427? and POST 254?

I'm trying to find out what POST 427 and 254 mean.  I am uploading some video files.  While it is working properly Firebug shows a POST 427, after it fails is shows a POST 254.
I believe the app uses Silverlight, with  HTML5 and Flash (maybe).
I searched the internet, but could not find any infomation.
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Author

Commented:
What is a "POST Upload"
RobOwner (Aidellio)
Most Valuable Expert 2015
Commented:
see here on what POST means: http://en.wikipedia.org/wiki/POST_(HTTP)

It is a method for transferring data back and forth between a server

Author

Commented:
tagit, thanks  
Owner (Aidellio)
Most Valuable Expert 2015
Commented:
Sounds like the errors are local to the flash or silverlight app.  is there any more code or information you can give us?

Author

Commented:
I need more code.