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HTTPのステータスコード

HTTP 1.0 HTTP 1.1
2xx: Success (成功) 1xx: Informational (情報)
200 OK 100 Continue
201 Created 101 Switching Protocols
202 Accepted    
204 No Content    
3xx: Redirection (転送) 2xx: Success (成功)
301 Moved Permanently 200 OK
302 Moved Temporarily 201 Created
304 Not Modified 202 Accepted
    203 Non-Authoritative Information
    204 No Content
    205 Reset Content
    206 Partial Content
4xx: Client Error 3xx: Redirection (転送)
400 Bad Request 300 Multiple Choices
401 Unauthorized 301 Moved Permanently
403 Forbidden 302 Moved Temporarily
404 Not Found 303 See Other
    304 Not Modified
    305 Use Proxy
5xx: Server Error 4xx: Client Error
500 nternal Server Error 400 Bad Request
501 Not Implemented 401 Unauthorized
502 Bad Gateway 403 Forbidden
503 Service Unavailable 404 Not Found
    405 Method Not Allowed
    406 Not Acceptable
    407 Proxy Authentication Required
    408 Request Time-out
    409 Conflict
    410 Gone
    411 Length Required
    412 Precondition Failed
    413 Request Entity Too Large
    414 Request-URI Too Large
    415 Unsupported Media Type
  5xx: Server Error
    500 nternal Server Error
    501 Not Implemented
    502 Bad Gateway
    503 Service Unavailable
    504 Gateway Time-out
    505 HTTP Version not supported

※ HTTP 1.0の100番代は「Informational」と定義されていて、
将来のために予約されているだけで実際のコード割り当ては無し