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Re: [presentation-api] Define a bi-directional data channel between opening and presenting browsing contexts

From: François Daoust via GitHub <sysbot+gh@w3.org>
Date: Fri, 12 Jun 2015 15:31:56 +0000
To: public-secondscreen@w3.org
Message-ID: <issue_comment.created-111528995-1434123116-sysbot+gh@w3.org>
During the F2F, we wondered about how WebSockets and WebRTC handled 
messages consisting of and empty string. I investigated and totally 
agree with @mwatson2 that the algorithms described in both specs do 
not treat empty strings in any special way, and thus empty strings 
should be treated as any other string message, following the exact 
same steps.

In other words, calling `send('')` should send an empty string over 
the communication channel and trigger a `message` event on the 
receiving side. This is exactly what happens in all WebSockets 
implementations that I tested.

However, as reported by @avayvod during the F2F, Chrome and Firefox 
silently drop empty string messages sent over a WebRTC data channel 
for the time being. I believe that is a bug in the way they interpret 
the specification and I submitted a test case for the WebRTC test 
suite that specifically checks that point, see:


I do not think that we need to change anything in the Presentation API
 for that.

GitHub Notif of comment by tidoust
Received on Friday, 12 June 2015 15:31:59 UTC

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