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New posts in if-modified-since

When does a webbrowser send If-Modified-Since?

Can't I set If-Modified-Since on a WebClient?

detect if a web page is changed

Is it valid to modify a REST API representation based on a If-Modified-Since header?

rest if-modified-since

Chrome doesn't send "If-Modified-Since"

http if-modified-since

Why is PHP discriminating between .php and .abc extensions for caching?

Edge does not play video if server returns 304

What is the point of If-Unmodified-Since/If-Modified-Since? Aren't they superseded by ETags?

Handling If-modified-since header in a PHP-script

php if-modified-since

Understand If-Modified-Since HTTP Header

(Weak) ETags and Last-Modified

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

Why am I getting "(304) Not Modified" error on some links when using HttpWebRequest?

how does a etag work in expressjs