304 Not Modified
If the client has performed a conditional GET request and access is allowed, but the document has not been modified, the server SHOULD respond with this status code. The 304 response MUST NOT contain a message-body, and thus is always terminated by the first empty line after the header fields.
The difference
No 304 support
With 304 support
ETag
How it looks
-
Response:
-
ETag:"047c6d76425"
-
-
Next request:
-
If-None-Match:"047c6d76425"
-
Last Modified
How it looks
- Response:
-
Last-Modified: Wed, 11 Feb 2015 16:48:24 GMT
-
- Next request:
-
If-Modified-Since: Wed, 11 Feb 2015 16:48:24 GMT
-
Checkpoint
implementation
There are only two hard things in Computer Science: cache invalidation and naming things.
