How to get Response from apex_web_service.make_rest_request??

Hi,

I have a NodeJS application which host my REST Webservice to return a PDF document as a Base64 encoded string data. I am calling this web service from APEX using the following code

DECLARE

 l_cursor SYS_REFCURSOR;

 l_body_clob    clob;

 l_resp_clob    clob;

 l_blob  BLOB := empty_blob();

 --l_blob   BLOB;

 l_step  number := 22500; 

BEGIN

  DBMS_LOB.OPEN(l_blob, DBMS_LOB.LOB_READONLY);

 OPEN l_cursor FOR

  SELECT cust.customer_name,

     cursor(select 

     products.product_name

     ,case

     when products.uom_type ='RANGE_VALUE' then

     products.range_low||products.uom||'-'||products.range_high||products.uom

     else

     products.absolute_value||products.uom

     end reference_range

     from xxdiag.xxeba_patient_order_lines_all lines,

       xxdiag.eba_cust_products products,

       xxdiag.eba_cust_product_families fam

     where orders.order_header_id = lines.order_id

     and lines.product_id = products.id

    and products.product_family_id = fam.id) lines

  FROM xxdiag.eba_cust_customers cust,

     xxdiag.xxeba_patient_orders orders

  WHERE orders.customer_id = cust.id;

 APEX_JSON.initialize_clob_output;

 APEX_JSON.open_object;

 APEX_JSON.write('orders', l_cursor);

 APEX_JSON.close_object;

   l_body_clob   := APEX_JSON.get_clob_output;

   apex_web_service.g_request_headers.delete();

   apex_web_service.g_request_headers(1).name := 'Content-Type'; 

   apex_web_service.g_request_headers(1).value := 'application/json';

   apex_web_service.g_request_headers(2).name := 'TemplateName'; 

   apex_web_service.g_request_headers(2).value := 'Biochemistry';

   l_resp_clob := apex_web_service.make_rest_request(

         p_url => '***' - the REST WebService URL  

     p_http_method => 'POST',

     p_body => l_body_clob

     ); 

  DBMS_OUTPUT.put_line('Response:'||l_resp_clob);

 APEX_JSON.free_output;

END;

But I am not able capture the response. When I call the same web service using soapui I get the response.

Could you please help me?

Thanks,

Mehabub