生產環境常見的HTTP狀態碼列表

200 - OK，服務器成功返回網頁 
    - Standard response for successful HTTP requests.

301 - Moved Permanently（永久跳轉），請求的網頁已永久跳轉到新位置。
    - This and all future requests should be directed to the given.

403 - Forbidden（禁止訪問）,服務器拒絕請求
    - forbidden request (matches a deny filter) => HTTP 403
    - The request was a legal request, but the server is refusing to respond to it.

404 - Not Found,服務器找不到請求的頁面。
    - The requested resource could not be found but may be available again in the future.

500 - Internal Server Error（內部服務器錯誤）
    - internal error in haproxy => HTTP 500
    - A generic error message, given when no more specific message is suitable.

502 - Bad Gateway（壞的網關）,通常是網關服務器請求後端服務時，後端服務沒有按照http協議正確返回結果。
    - the server returned an invalid or incomplete response => HTTP 502
    - The server was acting as a gateway or proxy and received an invalid response from the upstream server.

503 - Service Unavailable（服務當前不可用）,可能由於超載或停機維護。
    - no server was available to handle the request => HTTP 503
    - The server is currently unavailable (because it is overloaded or down for maintenance).

504 - Gateway Timeout（網關超時）,通常是網關服務器請求後端服務時，後端服務沒有在特定的時間內完成服務。
    - the server failed to reply in time => HTTP 504
    - The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.

轉載於:http://oldboy.blog.51cto.com/2561410/716294