目前，手机客户端上网数量已经远远超出PC端上网。手机上网确实方便，不过，也有“难为”你的时候。小编经常遇到这样的情况：手机网络连接明明没有任何问题，大多数应用可以上网，但是个别软件却无法登陆。比如，想登陆QQ，却提示：“连接超时，请检查网络设置”。
6月21日，云服务平台Cloudflare更新系统状态，Cloudflare正在调查该公司服务或网络的广泛问题，用户在访问Cloudflare的网络或服务时可能会遇到错误或超时，该问题已被确定并正在实施修复。
看来wget之前也存在此类问题，于是继续搜索标准，输出如下:The presence of a message body in a response depends on both the request method to which it is responding and the response status code . Responses to the HEAD request method never include a message body because the associated response header fields ， if present， indicate only what their values would have been if the request method had been GET . 2xx responses to a CONNECT request method switch to tunnel mode instead of having a message body. All 1xx ， 204 ， and 304 responses do not include a message body. All other responses do include a message body， although the body might be of zero length.
