ORA-29270: too many open HTTP requests - plsql

Question

Can someone help me with this problem that occurs whenever you run a TRIGGER, but works in a normal PROCEDURE?
TRIGGER:
create or replace
procedure testeHTTP(search varchar2)
IS
Declare
req sys.utl_http.req;<BR>
resp sys.utl_http.resp;<BR>
url varchar2(500);
Begin
url := 'http://www.google.com.br';
dbms_output.put_line('abrindo');
-- Abrindo a conexão e iniciando uma requisição
req := sys.utl_http.begin_request(search);
dbms_output.put_line('preparando');
-- Preparandose para obter as respostas
resp := sys.utl_http.get_response(req);
dbms_output.put_line('finalizando response');
-- Encerrando a comunicação request/response
sys.utl_http.end_response(resp);
Exception
When Others Then
dbms_output.put_line('excecao');
dbms_output.put_line(sys.utl_http.GET_DETAILED_SQLERRM());
End;

Answer 1

close your user session and then the problem is fixed.
Internal there is a limit from 5 http requests.
Might a problem is the missing: utl_http.end_response
or an exception in the app and not a close from the resp object.
modify the code like that:
EXCEPTION
WHEN UTL_HTTP.TOO_MANY_REQUESTS THEN
UTL_HTTP.END_RESPONSE(resp);

Answer 2

you need to close your requests once you are done with them, it does not happen automatically (unless you disconnect form the db entirely)
It used to be utl_http.end_response, but I am not sure if it is the same api any more.

Answer 3

Usually we need UTL_HTTP.END_RESPONSE(resp); to avoid of ORA-29270: too many open HTTP requests, but I think I reproduced the problem of #Clóvis Santos in Oracle 19c.
If web-service always returns status 200 (success) then too many open HTTP requests never happens. But if persistent connections are enabled and web-service returns status 404, behavior becomes different.
Let`s call something that always return 404.
First call of utl_http.begin_request returns normally and opens new persistent connection. We can check it with select utl_http.get_persistent_conn_count() from dual;. Second call causes an exception inside utl_http.begin_request and persistent connection becomes closed. (Exception is correctly handled with end_response/end_request).
If I continue then each odd execution returns 404 normally and each even execution gives an exception (handled correctly of course).
After some iterations I get ORA-29270: too many open HTTP requests. If web-service returns status 200 everything goes normally.
I guess, it happens because of the specific web-service. Probable it drops persistent connection after 404 and doesn't after 200. Second call tries to reuse request on persistent connection but it doesn't exist and causes request leak.
If I use utl_http.set_persistent_conn_support (false, 0); once in my session the problem disappears. I can call web-service as many times as I need.
Resolution:
Try to switch off persistent connection support. Probable, on the http-server persistent connections work differently for different requests. Looks like a bug.