Re: [Xsltforms-support] XSLTForms and REST

[Efraim F. <efr...@gm...>]

Hi,

On 02/11/2011 08:06 AM, Grégoire COLBERT wrote:
> Le 05/01/2011 23:38, Stephen Cameron a écrit :
>>
>> Hello All,
>>
>> I have been reading up on REST, there is quite a bit more to it than 
>> I first imagined.
>>
>> Its essential to be able to read and set header information in the 
>> client, such as to read the "Location" header in a POST response to 
>> extract a newly generated resource id.
>>
>> I'm wondering if anyone has looked at this in respect of XSLTForms?
>>
>
> Hi Stephen!
>
> I'm facing the same question! I would like to read the HTTP status 
> code from XSLTForms. Have you succeeded in doing this?

There are essentially 2 ways (that I know of) to set headers:
One of them is to set a session cookie, which is passed back in the 
response header and automatically passed in the request header of 
subsequent HTTP requests.  It's somewhat un-REST-like in the strict 
sense, but you can use a REST-like design on the server side and treat 
the information in it like any other header-based information. The 
advantage of them is that your client side web application doesn't have 
to pass internal variables between pages.
The second is the xf:header element as a child of the xf:submission 
element.  It does work in XSLTForms.

To get response codes, the XForms spec says that you should be able to 
catch xf:submit-done or xf:submit-error and use the event() function to 
get the response codes and reasons, as described in 
http://www.w3.org/TR/xforms11/#submit . As far as I could tell, it 
doesn't work in XSLTForms.

One way to work around the latter issue is to catch the error in your 
server side script before it returns and send back some XML describing 
the error/error code to the client, which can then handle 
xforms-submit-done differently if it receives the error code (the 
conditional xf:action/@if is helpful here).  It's ugly, but it does work.

Hope this helps,

-- 
---
Efraim Feinstein
Lead Developer
Open Siddur Project
http://opensiddur.net
http://wiki.jewishliturgy.org