DECLARE
 req   utl_http.req;
 resp  utl_http.resp;
 value VARCHAR2(1024);
 v_url varchar2(1000);
BEGIN

 --utl_http.set_proxy('proxy.my-company.com', 'corp.my-company.com');
v_url:='http://api.clickatell.com/http/sendmsg''&''api_id=xxx''&''user=xxx''@''xxx.com''&''password=LokeshKumar''&''to=xxxxxxxxxx''&''text=message';

 req := utl_http.begin_request
 (url => v_url,
    method => 'POST');
 utl_http.set_header(req, 'User-Agent', 'Mozilla/4.0');
 resp := utl_http.get_response(req);
 LOOP
   utl_http.read_line(resp, value, TRUE);
  dbms_output.put_line(value);
 END LOOP;
 utl_http.end_response(resp);
EXCEPTION
 WHEN utl_http.end_of_body THEN
   utl_http.end_response(resp);
END;