if-modified-since

If-Modified-Since not considered while using httr GET?

My requirement/objective: I'm retrieving Facebook posts for the past 3 months from a public page, and I would like to select only those posts which have been modified in the recent past (in the last 2 days). I'm using httr R package, and using the GET function to accomplish the above. I tried the...

What response should If-Modified-Since HTTP Header return if request is HEAD?

If you send a GET request with an If-Modified-Since header, the server suports it and the file hasn't changed, the server will return a 304 response. If you sent a HEAD request in the same circumstances, should the server send a 304 response or send back the full headers you would have sent had the...

Chrome - why is it sending if-modified-since requests?

I have a page with lots of small images (icons). When used with chrome, each time the page is reloaded, chrome requests each icon from the server with if-modified-since header. All icons are served with expires and max-age headers. Firefox loads images from its cache. Why is chrome doing that and...