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).
Description
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.
Quand vous le voyez
When a client sends an Expect: 100-continue header, the server responds with 100 before the client sends the body.
Comment résoudre
This is an interim response — no fix needed. The client should continue sending the request body.
Description
The client needs to authenticate to gain network access. Used by captive portals (hotel/airport WiFi).
Quand vous le voyez
When connecting to WiFi that requires login (airport, hotel, coffee shop).
Comment résoudre
Open a browser and complete the captive portal login process.
Différences clés
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).
Quand utiliser lequel
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.