Send huge data through post request from oracle database

Question

I am trying to send data via an HTTP post request from Oracle using UTL_HTTP. The code is like this:

REQ := UTL_HTTP.BEGIN_REQUEST(URL,'POST','HTTP/1.1')
UTL_HTTP.SET_HEADER(REQ,'USER-AGENT','MOZILLA/4.0')
UTL_HTTP.SET_HEADER(REQ,'CONENT-LENGT',LENGTH(V_BODY)
UTL_HTTP.SET_HEADER(REQ,'CONTENT-TYPE','APPLICATION/JSON')
UTL_HTTP.SET_HEADER(REQ,'SDATE','01/06/2021')

UTL_HTTP.WRITE_RAW(REQ,UTL_RAW.CAST_TO_RAW(V_BODY)
RES := UTL_HTTP.GET_RESPONSE(REQ);
UTL_HTTP.READ_TEXT(RES,BUFFER);

Inside the V_BODY parameter is a clob containing JSON and this json I select from database then put in a clob. Now the request is working fine when the selected data records about 50 to 100 request, but I need to send one million records, and when I trying sending such request it fails when putting the clob as a parameter. It like the http request does not allow me to send such huge data. What is the best way to handle this issue or is there a way to send it in smaller chunks?

Answer 1

You can use a header to tell the target that you are going to send the data in chunks.

utl_http.set_header (l_request, 'Transfer-Encoding', 'chunked');

Then you send the data in batches using what carving up mechanism you like

utl_http.write_raw(l_request, [first 32k]);
utl_http.write_raw(l_request, [next 32k]);

etc etc.

If that doesn't work, it may be an issue with the receiver because not all web servers will happily accept chunked requests.