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Re: HTTP binding options

From: Philippe Le Hegaret <plh@w3.org>
Date: Fri, 07 Nov 2003 12:03:24 -0500
To: Sanjiva Weerawarana <sanjiva@watson.ibm.com>
Cc: Web Services Description <www-ws-desc@w3.org>
Message-Id: <1068224604.18294.35.camel@jfouffa.w3.org>

On Thu, 2003-11-06 at 11:57, Sanjiva Weerawarana wrote:
> The "HTTP binding table" at the post-meeting lunch came up
> with the following possible options for the HTTP binding:
> 
> option 1:
>     drop HTTP binding completely
> 
> option 2:
>     define a POST binding only with the natural binding possible:
>     input becomes POST body and output must be POST response
> 
> option 3:
>     define option 2 +
>     define GET binding for operations with MEP=in-out and with no
>     input body (i.e., GET goes to http:address URL) and the output
>     must be the GET response
> 
> option 4:
>     define option 3 + 
>     define GET binding for operations with MEP=in-out and @style=rpc
>     ala the WSDL 1.1 binding, but with rules to move all parameters 
>     into query parameters. (That is, no URL rewriting ala WSDL 1.1.)
> 
> option 5:
>     define option 4 +
>     add URL replacement to allow different parts to go in the URL
>     itself vs. as query params
> 
> There was pretty strong sentiment against doing (5). (4) has the
> negative that the value of operation/@style is bleeding into the
> binding - which would be unfortunate. (3) is interesting and can
> be generalized a bit for other MEPs if needed. An interesting twist
> on (3) could be to allow appending a relative URL to the adresss
> on a per-operation  basis. That's not without price (inconsistent
> use of xml:base for relative URLs for one).
> 
> My current preference is that we do option (2).

I currently favor option 5. SOAP 1.2 includes a SOAP response-only MEP
and we ought to support it reasonably, which not the case of option 1,
2, and 3. It is also a matter of enabling Web applications to take
advantage of Web Services, without requiring a SOAP stack. True enough,
this has to be done with limitations, because of the limitations of HTTP
itself. Option (4) can require to use the RPC style at the interface
level if necessary. Regarding option 5, the idea of not being able to
expose a database of images where each image has its own uri, without
using parameters, is simply absurd. HTTP is out there and we better take
advantage of it. Finally, I would note that enabling option 5 does
affect at all our abstract model. It does affect the way applications
can define interfaces since the RPC style must be required in the case
of HTTP GET.

Philippe
Received on Friday, 7 November 2003 12:04:01 GMT

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