HTTP 100 Continue vs 204 No Content
HTTP 100 (Continue) is a 1xx Informational response, while 204 (No Content) is a 2xx Success 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, 204 means that the server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
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 server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
When You See It
After DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
How to Fix
No fix needed. The action was successful; there is simply no content to return.
Key Differences
100 is a 1xx Informational response, while 204 is a 2xx Success 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 204: The server successfully processed the request but is not returning any content. Common for DELETE operations and form submissions that don't need a response body.
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 204 when after DELETE requests, PUT updates where no body is needed, or CORS preflight responses.
When to Use Which
For 100 (Continue): This is an interim response — no fix needed. The client should continue sending the request body. For 204 (No Content): No fix needed. The action was successful; there is simply no content to return.