HTTP POST and open external result

Question

Hi
Now I'm working through payment system.
I created APEX process like this:
DECLARE
post_str VARCHAR2 (4000) := 'p1=A&p2=B';
req UTL_HTTP.req;
resp UTL_HTTP.resp;
v_buffer VARCHAR2 (1024);
BEGIN
req :=
UTL_HTTP.begin_request (url => 'http://www.somesite.com/index.php',
method => 'POST'
UTL_HTTP.set_header (r => req,
NAME => 'Content-Type',
VALUE => 'application/x-www-form-urlencoded'
UTL_HTTP.set_header (r => req,
NAME => 'Content-Length',
VALUE => LENGTH (post_str)
UTL_HTTP.write_text (r => req, DATA => post_str);
resp := UTL_HTTP.get_response (r => req);
LOOP
UTL_HTTP.read_line (resp, v_buffer, TRUE);
DBMS_OUTPUT.put_line (v_buffer);
END LOOP;
UTL_HTTP.end_response (resp);
EXCEPTION
WHEN UTL_HTTP.end_of_body
THEN
UTL_HTTP.end_response (resp);
END;
Generaly it works but on the end I have to receive result from external site (http://www.somesite.com/index.php). In this site is PHP FORM wchich a have to manualy submit, according this probably in my process I have to exit from APEX but I don't know how. Of course exit has to be with this same POST session.

Answer 1

If nobody can halp me, maybe other way will be easier for example:
I want page created in apex with form, but form has to send value to external Web Page. (One condition I can't use link with values /GET method/)