对http的输出内容进行过滤，检查输出内容是否有不合适的字符串。如果有，不输出该http请求的结果，而重定向到一预先指定的页面；如果没有不合适的字符串，输出该http请求的结果。不合适的字符串，可以随时修改。-The output of the http content filtering, check whether there is inappropriate output string. If so, do not output the results of the http request, but redirected to a pre-specified page　if the string is not inappropriate, the output of the http request results. Inappropriate string can be modified at any time.