How to sent a POST request as json in plsql

After a lot of searching, i got the following code from a blog. Works fine for me.

declarereq utl_http.req;res utl_http.resp;url varchar2(4000) := 'http://192.168.1.194:8080/NotificationApp/sendNotification.rest';name varchar2(4000);buffer varchar2(4000); content varchar2(4000) := '{"code":100,"id": "APA91bFSmD_gBsUwO_hraRZL20mt8p4ejGn5fC7tlciINT50Ad8oIod2T-64GVk_8rProqXGEpYuDcoQogG0L7a0TuyeeisTcmHiUUONbnZzn4_u0ED7QD_iNeVkh1ZgU8Pa-HRtfgJUgOT-TyvlM9hB4Yn9fvOPud","data": "alert alert"}';beginreq := utl_http.begin_request(url, 'POST',' HTTP/1.1');utl_http.set_header(req, 'user-agent', 'mozilla/4.0'); utl_http.set_header(req, 'content-type', 'application/json'); utl_http.set_header(req, 'Content-Length', length(content));utl_http.write_text(req, content);res := utl_http.get_response(req);    begin    loop    utl_http.read_line(res, buffer);    dbms_output.put_line(buffer);    end loop;    utl_http.end_response(res);    exception    when utl_http.end_of_body then    utl_http.end_response(res);    end;end;

Now, I needed to change the line req := utl_http.begin_request(url, 'POST',' HTTP/1.1');

I did and worked:req := utl_http.begin_request(url, 'POST');

I got this excellent answer from Jeff

From Oracle 18.3+ you can use :body_text. So if you have some column example of JSON type, you can simply SET example=:body_text.