请求时发生异常2:<br/>http://upload237.joyes.com/robots.txt<br/>详细表现为2:The remote server returned an error: (404) Not Found.文件不存在请求时发生异常1:<br/>http://upload225.joyes.com/robots.txt<br/>e:\file3.zuoyu.com\robots.txt<br/>详细表现为1:Thread was being aborted.