william007
asked on
About If-Modified-Since
I type in the following in command prompt
telnet www.google.com 80
and type the following as the request html header
GET / HTTP/1.1
Host: www.google.com
If-Modified-Since: Mon, 19 Mar 2007 02:43:31 GMT
and sent, but it always return me http/1.1 200 OK and the entire webpage.
Is my syntax correct? Can somebody give me an example that will return http/1.1 304 modified with the correct syntax?
telnet www.google.com 80
and type the following as the request html header
GET / HTTP/1.1
Host: www.google.com
If-Modified-Since: Mon, 19 Mar 2007 02:43:31 GMT
and sent, but it always return me http/1.1 200 OK and the entire webpage.
Is my syntax correct? Can somebody give me an example that will return http/1.1 304 modified with the correct syntax?
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Also I discover that, for the images, it will always give me the same result, ie 304 not modified even I put different date, again, what is the reason?
GET http://www.new-dream.de/image/wallpaper/computer/apple/apple_14.jpg HTTP/1.1
Host: www.new-dream.de
If-Modified-Since: Wed, 20 Mar 2007 02:43:31 GMT
GET http://www.new-dream.de/image/wallpaper/computer/apple/apple_14.jpg HTTP/1.1
Host: www.new-dream.de
If-Modified-Since: Wed, 20 Feb 2007 02:43:31 GMT
GET http://www.new-dream.de/image/wallpaper/computer/apple/apple_14.jpg HTTP/1.1
Host: www.new-dream.de
If-Modified-Since: Wed, 20 Mar 2007 02:43:31 GMT
GET http://www.new-dream.de/image/wallpaper/computer/apple/apple_14.jpg HTTP/1.1
Host: www.new-dream.de
If-Modified-Since: Wed, 20 Feb 2007 02:43:31 GMT
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But if I try to send
GET / HTTP/1.1
Host: www.cyberpear.com
If-Modified-Since: Wed, 21 Mar 2007 02:43:31 GMT
Again it gives me http/1.1 200 OK. 21 Mar 2007 is later than 17 Dec 2006, but why doesn't give me the same result?
Also, how do you know what date to put there?
I am trying to write a proxy server that check the pages in its cache whether has been modified, hence I need to understand these things in details.