Problem when using utl.http package

Question

hello,as subject above,i have a problem with that package
set serveroutput on
DECLARE
req   utl_http.req;
resp  utl_http.resp;
value VARCHAR2(32000);
BEGIN
req := utl_http.begin_request('http://www.psoug.org');
resp := utl_http.get_response(req);
value := utl_http.request('http://www.psoug.org/');
dbms_output.put_line(value);
utl_http.end_response(resp);
EXCEPTION
WHEN utl_http.end_of_body THEN
utl_http.end_response(resp);
END;
i tried to create ACL
BEGIN
DBMS_NETWORK_ACL_ADMIN.CREATE_ACL(acl         => 'www.xml',
description => 'WWW ACL',
principal   => 'SYSTEM',
is_grant    => true,
privilege   => 'connect');
DBMS_NETWORK_ACL_ADMIN.ADD_PRIVILEGE(acl       => 'www.xml',
principal => 'SYSTEM',
is_grant  => true,
privilege => 'resolve');
DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL(acl  => 'www.xml',
host => '127.0.0.1');
END;
COMMIT;
but it still show error
Error report:
ORA-29273: HTTP request failed
ORA-06512: at "SYS.UTL_HTTP", line 1722
ORA-29270: too many open HTTP requests
ORA-06512: at line 9
*29273. 00000 - "HTTP request failed"*
**Cause: The UTL_HTTP package failed to execute the HTTP request.*
**Action: Use get_detailed_sqlerrm to check the detailed error message.*
Fix the error and retry the HTTP request.
Thank

Answer 1

check
     Why ORA-29270 'Too Many Open HTTP Requests' occurs with UTL_HTTP? [ID 961468.1]
The database server has a hardcoded limit of 5 open HTTP connections per session.