????403 Forbidden
????????????????????????????????????????????????б?????????????????????????????????????????????????巋????????????????????????????????
????δ????????????????????????????Щ??????δ?????????IP???????????????????????403?????
????404 Not Found
??????????????????????????????????????????????????????????????????????????????????????????
????5XX Server Error
????Response status codes beginning with the digit “5″ indicate cases in which the server is aware that it has erred or is incapable of performing the request.
????5XX ??????????????????????????????????????????????????????
????500 Internal Server Error
??????????????????????????????????????????п?????Web???????BUG???Щ?????????
????503 Service Unavailable
????????????????????????????????????????????????????????????????????????????????????????д??Retry-After??????????????????