Hi!

I was googling a lot with very different queris to find an answer, lets
see:
I'm programming a script who work with web files (html and rss), the
program check if exists modifications in tons of urls. It was wondering
if I could check the data modification (like a local file) to avoid to
download the file and load to memory (for compare with cached files) if
the file didn't change.

The question is: are there a method to know the modified date (or other
metada) of a file from the url?

I hope the question was clear and tanks for your time.
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