Any convenient way to embed external pages?

[taabpr]

Hi all,
It is a little bit connected with my previous mail (html generator with 
'post'), but much general question.
I have to embed some external content into existing page (a portlet) - 
to be more complex: they are forms with images.
So what I imaging is:
in sitemap:
       <map:match pattern="integratedata/*">
           <map:call resource="http://external_location/{1}"; />
           <map:serialize/>
       </map:match>

So it takes care of all requests, + GET + POST.
Unfortunately it doesn't work with map:call.
My current solution is:
       <map:match pattern="integratedata/data*">
           <map:generate type="html" 
src="http://localhost:8080/xxx/data{1}?{request:queryString}"/>
           <map:serialize type="html"/>
       </map:match>

    <map:match pattern="integratedata/*.gif">
               <map:read mime-type="images/gif" 
src="http://localhost:8080/xxx/{1}.gif"/>
       </map:match>

Drawbacks:
1. I've to use GET method. How to move to POST?
2. Diferent matchers for different content.
3. When source changes I have to adjust to it (new reader, etc)
The first drawback could be really problem when form sends too much data 
- GET has limited uri.

Is there any way to simply achieve this? Any block?
Thanks,
   Tom

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