PL/SQL procedure for download files with resumes broken downloads support.

I need to write PL/SQL procedure for download files with resumes broken downloads support. But I have one problem.

I can't get http request RANGE value in my PL/SQL procedure.

See also: http://en.wikipedia.org/wiki/List_of_HTTP_headers

This is my procedure:

 procedure download_file(p_file_id in number) is

  l_file_name docs.file_name%type; 

  l_mime_type docs.mime_type%type; 

  l_content   docs.content%type;

  l_file_size number(20);

  

  -- for http request Range support

  l_range varchar2(128 char); 

  l_range_start number(20);

  

  l_amt number(4) := 4096;

  l_raw raw(4096);

  l_offset number(20);