copy on write

 yl::string CBaseAutopProcessor::AddAuthorizedInfo(const yl::string & strOriginalUrl,
         const yl::string & strUserName, const yl::string & strPassword)
 {
     yl::string strUrl = strOriginalUrl;//cow exist error

     if (strOriginalUrl.empty()
             || strUserName.empty())
     {
         return strUrl;
     }

     char * pBuf = (char *) strUrl.c_str();
     char * pTemp = NULL;
     if ((pTemp = strstr(pBuf, "://")) != NULL)
     {
         *pTemp = '\0';  //cow will cause strUrl and strOriginalUrl change
         pTemp += ;

         // 加入用户名和密码
         char bufURL[] = {};
         sprintf(bufURL, "%s://%s:%s@%s", pBuf, strUserName.c_str(), strPassword.c_str(), pTemp);
         strUrl = bufURL;
     }

     return strUrl;
 }