Chrome browser is not sending if-modified-since header to server
I have these headers being sent to the client by the server:
Cache-Control:private Connection:keep-alive Content-Encoding:gzip Content-Type:text/html Date:Sun, 27 Nov 2011 11:10:38 GMT ETag:"12341234" Set-Cookie:connect.sid=e1u...7o; path=/; expires=Sun, 27 Nov 2011 11:40:38 GMT; httpOnly Transfer-Encoding:chunked last-modified:Sat, 26 Nov 2011 21:42:45 GMT
I want the client to validate that the file hasn't changed on the server and send a "200" if it has otherwise a "304".
if-modified-since: Sat, 26 Nov 2011 21:42:45 GMT if-none-match: "12341234"
Why isn't the chrome sending the same on a refresh of the page? I'm after the behavior that .Net has running:
In my experience you need more than just the "Private" Cache-Control header. You need either "Max-Age" or "Expires" to force Chrome to revalidate content with the server.
Remember that revalidation will only start after these time values have elapsed, so they may need to be set to a small value.