[dev] Consider ignoring upload Content-Type

[Jan Schneider]

One of the most often reported problems with IMP is about  
clients/browser sending the wrong content type with file uploads.
No question that we are doing it the right way. But fact is that there  
are lots of broken user systems out there, and the problem can only be  
fixed on the client system. This is especially problematic with a  
server-side software like Horde.
Thus I'd like to discuss whether we should start ignoring the content  
type of file uploads completely and instead rely on server-side mime  
magic. The advantage is, that the behavior is the same for every  
client, and that administrator can fix wrong detections at a single  
place, and at a place they actually have access too. Of course this  
makes mime magic a requirement for Horde.
It might not be the right behavior RFC wise and add another  
prerequisite, but it would improve the user and administrator  
experience a lot IMO.

Jan.

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