HTTP 100 Continue vs 511 Network Authentication Required
HTTP 100 (Continue) is a 1xx Informational response, while 511 (Network Authentication Required) is a 5xx Server Error response. 100 indicates that the server has received the request headers and the client should proceed to send the request body. This lets the client know it can continue with the request or abort if the headers were rejected. In contrast, 511 means that the client needs to authenticate to gain network access. Used by captive portals (hotel/airport WiFi).
説明
The server has received the request headers and the client should proceed to send the request body. This lets the client know it can continue with the request or abort if the headers were rejected.
このコードが表示される場合
When a client sends an Expect: 100-continue header, the server responds with 100 before the client sends the body.
解決方法
This is an interim response — no fix needed. The client should continue sending the request body.
説明
The client needs to authenticate to gain network access. Used by captive portals (hotel/airport WiFi).
このコードが表示される場合
When connecting to WiFi that requires login (airport, hotel, coffee shop).
解決方法
Open a browser and complete the captive portal login process.
主な違い
100 is a 1xx Informational response, while 511 is a 5xx Server Error response.
HTTP 100: The server has received the request headers and the client should proceed to send the request body. This lets the client know it can continue with the request or abort if the headers were rejected.
HTTP 511: The client needs to authenticate to gain network access. Used by captive portals (hotel/airport WiFi).
You encounter 100 when when a client sends an Expect: 100-continue header, the server responds with 100 before the client sends the body.
You encounter 511 when when connecting to WiFi that requires login (airport, hotel, coffee shop).
どちらをいつ使うか
For 100 (Continue): This is an interim response — no fix needed. The client should continue sending the request body. For 511 (Network Authentication Required): Open a browser and complete the captive portal login process.