问ORA-12545:连接失败，因为目标主机或对象不存在ORA-06512

EN

req := UTL_HTTP.BEGIN_REQUEST('oracle.com'); 

DECLARE 
    req UTL_HTTP.REQ; 
    resp UTL_HTTP.RESP; 
    name_1 VARCHAR2(256); 
    value_1 VARCHAR2(1024); 
    v_msg VARCHAR2 (500);

BEGIN 
    req := UTL_HTTP.BEGIN_REQUEST('http://www.oracle.com'); 
    UTL_HTTP.SET_HEADER(req, 'User-Agent', 'Mozilla/5.0'); 
    UTL_HTTP.SET_FOLLOW_REDIRECT(req, 0); 
    resp := UTL_HTTP.GET_RESPONSE(req); 
    LOOP
        Utl_Http.read_text (resp, v_msg);
        DBMS_OUTPUT.put_line (v_msg);
    END LOOP;

    UTL_HTTP.END_RESPONSE(resp);
EXCEPTION
    WHEN Utl_Http.end_of_body
        THEN
        NULL; 
END;