Using HTTP 304 code

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Hello

I'm trying to make a web browser in vb6. I'm unable to hand to handle
the 304 code (cache check). Can anyone tell me what request is sent by
a browser to a webserver in order to check from the webserver whether
a file has been updated or not.

Im trying to send this request:

GET /test/index.asp HTTP/1.1
Accept: */*
Accept-Language: en-us
Accept-Encoding: gzip, deflate
If-Modified-Since: Mon, 28 Jul 2008 09:25:35 GMT
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;
Q312461)
Host: localhost
Connection: Keep-Alive


The 'if-modified-since' shows the date of the file on the server. As
per my understanding, the server should return HTTP 304 code if the
file is of the same date on the server. But instead its returning the
complete file again. Therefore my cache system is not working
properly.

Any advises ?
.

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