HTTP之Response状态码

Status-Code

- 1xx: Informational - Request received, continuing process

- 2xx: Success - The action was successfully received,
        understood, and accepted
- 3xx: Redirection - Further action must be taken in order to
        complete the request

- 4xx: Client Error - The request contains bad syntax or cannot
        be fulfilled

- 5xx: Server Error - The server failed to fulfill an apparently
        valid request

    Status-Code    =    Status-text
            "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 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
          | "416"  : Requested range not satisfiable
          | "417"  : Expectation Failed
          | "500"  : Internal Server Error
          | "501"  : Not Implemented
          | "502"  : Bad Gateway
          | "503"  : Service Unavailable
          | "504"  : Gateway Time-out
          | "505"  : HTTP Version not supported

详情：https://tools.ietf.org/html/rfc2616#section-10.1.1