What does ‘?’ do in a Css link?

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That is there to add some uniqueness to the filename, so that when they change the CSS file, they can change the extra bit to be totally sure that every client will reload the CSS rather than use a cached version.

The webserver will ignore the parameter and serve /Content/all.min.css normally

Note: While it’s possible the CSS is dynamically generated, this is a common idiom for ensuring a reload, and given the parameter is a date, it seems quite likely.

Edit: Podcast 38 mentioned this…

We’ve been using the Expires or
Cache-Control Header since we
launched. This saves the browser
round-trips when getting infrequently
changing items, such as images,
javascript, or css. The downside is
that, when you do actually change
these files, you have to remember to
change the filenames. A part of our
build process now “tags” these files
with a version number so we no longer
have to remember to do this manually.

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