http状态码

 Number:Description 
         100:Continue
           101:Switching protocols
           200:OK
           201:Created
           202:Accepted
           203:Non-Authoritative Information
           204:No Content
           205:Reset Content
           206:Partial Content
           300:Multiple Choices
           301:Moved Permanently
           302:Found
           303:See Other
           304:Not Modified
           305:Use Proxy
           307:Temporary Redirect
           400:Bad Request
           401:Unauthorized
           402:Payment Required
           403:Forbidden
           404:Not Found
           405:Method Not Allowed
           406:Not Acceptable
           407:Proxy Authentication Required
           408:Request Timeout
           409:Conflict
           410:Gone
           411:Length Required
           412:Precondition Failed
           413:Request Entity Too Large
           414:Request-URI Too Long
           415:Unsupported Media Type
           416:Requested Range Not Suitable
           417:Expectation Failed
           500:Internal Server Error
           501:Not Implemented
           502:Bad Gateway
           503:Service Unavailable
           504:Gateway Timeout
           505:HTTP Version Not Supported