Fwd: Use of HTTP in VoiceXML3

CC'ing www-voice.

Begin forwarded message:

> From: Dan Burnett <dburnett@voxeo.com>
> Date: May 4, 2009 6:07:24 AM EDT
> To: Lisa Dusseault <Lisa.Dusseault@messagingarchitects.com>
> Subject: Re: Use of HTTP in VoiceXML3
>
> Hi Lisa,
>
> Thanks for your comments.  We will review these and likely ask for  
> your help with the more detailed review that you suggest.
>
> Dan Burnett
> Co-editor, VoiceXML 3
>
>
> On Feb 25, 2009, at 3:13 PM, Lisa Dusseault wrote:
>
>> Hi,
>>
>> As a part of reviewing http://tools.ietf.org/html/draft-ietf-mediactrl-vxml-04 
>> , I had occasion to look at the recommendations for VoiceXML 2.0  
>> and 2.1.  I noticed that use of POST is quite underspecified!  Some  
>> examples:
>> - The Content-Type has to be inferred, as it's not required to be  
>> anything
>> - I assume 'next' is used to construct the URI to send the GET or  
>> POST to but this isn't explained or referenced
>>
>> When HTTP is used to tunnel application messages, we're coming to  
>> understand a bunch of additional things must be said to ensure  
>> interoperability.  In a case like this:
>> - What are the appropriate HTTP success codes?  Failure codes?
>> - MUST clients follow redirects?  Or are redirects completely  
>> inappropriate for the server to return?
>>
>> Finally, some requirements although perfectly clear in RFC2616 are  
>> missed more often than they're implemented in applications like  
>> this. For example:
>> - Servers MUST handle conditional headers
>> - Servers MUST handle chunked transfer-encoding
>>
>> At some point, review by IETF applications review team or HTTP WG  
>> members would be terrific for VoiceXML 3, and I can help find  
>> volunteers.  I also noticed that VoiceXML 3 goes further in its  
>> specification of caching, and we should make sure that synchs up  
>> well with the work in the HTTPBIS working group on caching.
>>
>> Thanks,
>> Lisa Dusseault
>> Applications Area Director, IETF.
>>
>>
>> --- Scanned by M+ Guardian Messaging Firewall ---
>> Messaging Architects sponsors The Spamhaus Project.
>>
>>
>>
>