ora-29259 end-of-input reached using UTL_HTTP.BEGIN_REQUEST - oracle

Question

I am making a stored procedure with 2 seperate HTTP Requests.
The first one to get an Atuthentication Token and the second one that uses the token.
The first Request works without a problem and I get the token back.
The second Request throws the ora-29259 end-of-input reached exception.
They both look exactly the same besides of the URL:
begin
req := utl_http.begin_request(url,'POST',utl_http.http_version_1_1);
utl_http.set_header(req, 'Authorization', Token/Credentials);
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);
loop
utl_http.read_text(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;
I have found this from nearly 3 years ago which suggests updating the database.
I am using Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production, is this the issue? I can't find any answer to this googling myself.
The first Website uses TLS 1.2 while the second one uses TLS 1.3, is my Oracle Version too old?

Answer 1

Please provide a sample of your code for a more detailed answer.
But looking at the link you provided, I can already see something missing in the code, which is the exception for utl_http.end_of_body.
This is an example of my code, I used somewhere else:
begin
req := utl_http.begin_request(url,'POST',utl_http.http_version_1_1);
utl_http.set_header(req, 'Content-Type', 'application/xml;charset=UTF-8');
utl_http.set_header(req, 'Content-Length', length(content));
utl_http.write_text(req, content);
res := utl_http.get_response(req);
loop
utl_http.read_text(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;