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We need to download the latest version of some xml feed from a 3rd party’s website automatically every once in a while, but don’t want to download it if there are no changes made to that file(since we already have it). The file goes something like XXXXX_latest.xml. Would it be possible to query the file’s create date, modified date through HTTP to compare with local ones?
Sure there is, it’s part of the HTTP protocol: Conditional GETs