apache - If a file is updated on a server, will the header expire on visitors' browser? -


this without doubt dumb question can't seem find answer it.

i added mod_deflate , header expire in htaccess

<filesmatch "\.(txt|xml|js|css)$">    header set cache-control "max-age=604800" </filesmatch>

my question was, if update css sheet, visitors' browser figure out it's been modified or ignore , won't grab again until expires (a week after) ?

thanks


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