U have meet 300's, 400's, 500's HTTP Status Condition !!!
HTTP Status Code 300 ~ 500
HTTP Status Code 300 : Multiple Choices
HTTP Status Code 301 : Moved Permantly
HTTP Status Code 302 : Found
HTTP Status Code 303 : See Other
HTTP Status Code 304 : Not Modified
HTTP Status Code 305 : Use Proxy
HTTP Status Code 306 : No longer Used (REMOVED)
HTTP Status Code 307 : Temporary Redirect
HTTP Status Code 400 : Bad Request
HTTP Status Code 401 : Unauthorized
HTTP Status Code 402 : Payment Required (Reserverd for Future Use)
HTTP Status Code 403 : Forbidden
HTTP Status Code 404 : Not Found
HTTP Status Code 405 : Method Not Allowed
HTTP Status Code 406 : Not Acceptable
HTTP Status Code 407 : Proxy Authentication Required
HTTP Status Code 408 : Request Timeout
HTTP Status Code 409 : Conflict
HTTP Status Code 410 : Gone
HTTP Status Code 411 : Length Required
HTTP Status Code 412 : Precondition Failed
HTTP Status Code 413 : Request Entity Too Large
HTTP Status Code 414 : Request-URI Too Long
HTTP Status Code 415 : Unsupported Media Type
HTTP Status Code 416 : Requested Range Not Satisfiable
HTTP Status Code 417 : Expectation Failed
HTTP Status Code 500 : Internal Server Error
HTTP Status Code 501 : Not Implemented
HTTP Status Code 502 : Bad Gateway
HTTP Status Code 503 : Service Unavailable
HTTP Status Code 504 : Gateway Timeout
HTTP Status Code 505 : HTTP Version Not Supported