HTTP Cache Control and the ETag
August 16th, 2012
No comments
HTTP and ETag
Download this capture file: ” IfModifieldSince_and_ETag ”
OR: view it now via Cloudshark
With caching enabled, a web server does not need to send a full response if content has not changed.
- If-Modified-Since is an HTTP request header that the client sends to your browser along with a request for content.
- Last-Modified is an HTTP response header that the server returns along with the requested content.
If-Modified-Since Allows a 304 Not Modified to be returned if content is unchanged
If-Modified-Since: Sat, 29 Oct 1994 19:43:31 GMT
If-None-Match Allows a 304 Not Modified to be returned if content is unchanged,
If-None-Match: "737060cd8c082f209582d" Read more…
