426217 - Open with (do this automatically) broken

Status: RESOLVED DUPLICATE of bug 285976

(Firefox :: File Handling, defect)

Description

[varg]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6

When opening certain files from certain websites, the Open With (even though the do this automatically for files of this type... button is ENABLED) - the Open with dialog still shows. What even more strange is that the Open with dialog has the 'Do this automatically...' checked, so it probably isn't even checking that setting or something.

Reproducible: Always

Steps to Reproduce:
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Comment 1

[cmtalbert]

We really need to know the types of files you're trying to open in order to adequately triage this bug.  But, it sounds like you're reporting the same issue that was reported in 427063, so I'm marking this bug as a duplicate of that one.

Comment 2

[varg]

I don't think this is a duplicate of bug 427063, because in this case media type is known. Look at the screenshot below. Even after selecting 'Do this automatically...' and uTorrent is selected as the default application and Firefox recognizes the file as a torrent file, it still pops up the Open with dialog everytime. Note that this does not happen on all sites.
This is the site where I tried this: http://btjunkie.org/torrent/Music-Video-Hits-2007/4032291f10635c4f34e5721787ab9e439aad3af817ec

But I noticed it happens almost always for .wmv files

Comment 3

[varg]

I forgot the link to the screenshot: http://img2.freeimagehosting.net/uploads/445bc9fb06.jpg

Comment 4

[Mardeg]

Examination of the Http headers from the server on the download link shows:

content-disposition: attachment; filename="Music_Video_Hits_2007.torrent"

This instructs the browser to explicitly prompt the user for further action, so doing something automatically will violate RFC 2183, see https://bugzilla.mozilla.org/show_bug.cgi?id=285976#c4

Comment 5

[cmtalbert]

Yeah, we're discussing how to handle content-disposition: attachment in bug 285976.  So, this is actually a dupe of that.  Thanks for clarifying the issue!