Problem doing partial refresh (pull) of HTML region

In my application, I have a page where on the left I have a list of documents and, on the right, selected document in PDF format.
The right region is defined as HTML:
<object id="DataPDF" data="f?p=&APP_ID.:18:&APP_SESSION.:APPLICATION_PROCESS=odp_show_doc::::" type="application/pdf"></object>The function odp_show_doc gets PDF document from a web service and returns a PDF BLOB that fills the region.
However, to refresh the region with valid document data, I have to resubmit the page each time the user selects a new document.
To refresh the page partially (only the PDF region), I have tried to use Carl Backstrom's example (http://apex.oracle.com/pls/otn/f?p=11933:48) to pull the PDF content from another page, but to no avail.
I have defined another page (2) with a region that does the job. When I go directly on that page, I see the PDF region filling. But when I try to pull the same page with the code
var gReturn;
var get=new htmldb_Get(null,html_GetElement('pFlowId').value,null, 2);
get.addParam('P0_NUM_DOC_GED', numDocGed);
gReturn = get.get(null,'<htmldb:BOX_BODY>','</htmldb:BOX_BODY>');
alert(gReturn);I get the following error:
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML2.0 EN">
<html>
 <head>
 <title>404 Not Found</title>
 </head>
 <body>
 <h1>Not Found</h1>
 The requested URL /pls/apex/wwv_flow.show was not found.
 </body>
<html>In this case, the odp_show_doc is never called (I have added some debug info in this ODP function).
Has anyone an idea of what I am doing wrong and what correction should I do to make this pull work?
Thank you.
Igor

Well... It seems to work directly on the machine, if I use the following URL when calling the application:
http://localhost:8080/apex/f?p=120However, when I call the application from outside with the URL
https://app-url/pls/apex/f?p=120, pulling the region based on on-demand-process results in:
The requested URL /pls/apex/wwv_flow.show was not foundPulling an ordinary report is OK.
Igor

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<nl>
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