HTTP 304 — Not Modified
The resource has not been modified since the last request
When to use it
Use status 304 when this is the correct HTTP response semantic: The resource has not been modified since the last request
Request and response example
GET /profile HTTP/1.1
Host: api.example.com
If-None-Match: "profile-v3"
HTTP/1.1 304 Not Modified
ETag: "profile-v3"