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We have an images folder on our web servers that we may publish via a CDN. Sometimes we append query-string like syntax to URL’s to help us freshen content that has changed, even though it rarely does. Example:
/images/file.png?20090821
will URL’s like this work with your average content-delivery-network?
Yes, We use Akamai, which keeps a cached copy of each distict url requested including the querystring. So the first request for /images/file.png?20090821 will go to the origin server. Requests there after for /images/file.png?20090821 will get the image from the Akamai servers. The next day, assuming the img src changes to /images/file.png?20090822, the first request will go to the origin server again.