HTTP 100 Continue vs 300 Multiple Choices
HTTP 100 (Continue) is a 1xx Informational response, while 300 (Multiple Choices) is a 3xx Redirection 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, 300 means that the request has more than one possible response. The client should choose one of them.
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.
When You See It
When a client sends an Expect: 100-continue header, the server responds with 100 before the client sends the body.
How to Fix
This is an interim response — no fix needed. The client should continue sending the request body.
Description
The request has more than one possible response. The client should choose one of them.
When You See It
When a resource is available in multiple formats (e.g., different languages or media types).
How to Fix
Select the appropriate resource variant. Send an Accept header with your preferred content type.
Key Differences
100 is a 1xx Informational response, while 300 is a 3xx Redirection 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 300: The request has more than one possible response. The client should choose one of them.
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 300 when when a resource is available in multiple formats (e.g., different languages or media types).
When to Use Which
For 100 (Continue): This is an interim response — no fix needed. The client should continue sending the request body. For 300 (Multiple Choices): Select the appropriate resource variant. Send an Accept header with your preferred content type.