你必須知道的HTTP錯誤，HTTP錯誤

你必須知道的HTTP錯誤，HTTP錯誤

發送網路請求有時失敗，分析一下響應行，在響應的響應行內，你會發現響應行由三部分組成，用空格來隔開，HTTP/1.1 404 NOT FOUND，第一個是響應的HTTP的版本，第二個和第三個是狀態值。

發送完網路請求會得到一個Error和response對象，我們不能單單只判斷Error，直接列印出error這個錯誤，我們應該分析respon的屬性statusCode，然後根據狀態代碼分析錯誤的原因

分析狀態值來分析網路請求錯誤的原因

分為五類錯誤

         下面列出了具體的網路請求錯誤

          |"100"  ; Section 10.1.1: Continue          | "101"  ; Section 10.1.2: Switching Protocols          | "200"  ; Section 10.2.1: OK          | "201"  ; Section 10.2.2: Created          | "202"  ; Section 10.2.3: Accepted          | "203"  ; Section 10.2.4: Non-Authoritative Information          | "204"  ; Section 10.2.5: No Content          | "205"  ; Section 10.2.6: Reset Content          | "206"  ; Section 10.2.7: Partial Content          | "300"  ; Section 10.3.1: Multiple Choices          | "301"  ; Section 10.3.2: Moved Permanently          | "302"  ; Section 10.3.3: Found          | "303"  ; Section 10.3.4: See Other          | "304"  ; Section 10.3.5: Not Modified          | "305"  ; Section 10.3.6: Use Proxy          | "307"  ; Section 10.3.8: Temporary Redirect          | "400"  ; Section 10.4.1: Bad Request          | "401"  ; Section 10.4.2: Unauthorized          | "402"  ; Section 10.4.3: Payment Required          | "403"  ; Section 10.4.4: Forbidden          | "404"  ; Section 10.4.5: Not Found          | "405"  ; Section 10.4.6: Method Not Allowed          | "406"  ; Section 10.4.7: Not Acceptable

          | "407"  ; Section 10.4.8: Proxy Authentication Required          | "408"  ; Section 10.4.9: Request Time-out          | "409"  ; Section 10.4.10: Conflict          | "410"  ; Section 10.4.11: Gone          | "411"  ; Section 10.4.12: Length Required          | "412"  ; Section 10.4.13: Precondition Failed          | "413"  ; Section 10.4.14: Request Entity Too Large          | "414"  ; Section 10.4.15: Request-URI Too Large          | "415"  ; Section 10.4.16: Unsupported Media Type          | "416"  ; Section 10.4.17: Requested range not satisfiable          | "417"  ; Section 10.4.18: Expectation Failed          | "500"  ; Section 10.5.1: Internal Server Error          | "501"  ; Section 10.5.2: Not Implemented          | "502"  ; Section 10.5.3: Bad Gateway          | "503"  ; Section 10.5.4: Service Unavailable          | "504"  ; Section 10.5.5: Gateway Time-out          | "505"  ; Section 10.5.6: HTTP Version not supported