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how can i figure out the last modified date of a html file im importing into my web app?
The html file is on another server and different users can make updates, when i retrieve the page i want to be able see when it was last updated so i can label the updated date on my homepage. I
I assume you are using HTTP to retrieve the page.
In that case you can use the HEAD method of HTTP to get the header data of the file. (See http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html, 9.4)
Then you can check the ‘Last-Modified’ header of the response. (See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html, 14.29)
In case of some caching mechanism (proxy, browser caching) it might be necessary to include ‘Cache-Control: must-revalidate’ in the request header. (See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html, 14.9.4)