For invalidating a
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If you want to invalidate selected objects but your users don't necessarily access every object on your origin, you can determine which objects viewers have requested from Cloud Front and invalidate only those objects.If you submit more than the allotted number of invalidation paths in a month, you pay a fee for each invalidation path that you submit.For more information about the charges for invalidation, see Paying for Object Invalidation.If client requests include five different query strings for the same object, you can either invalidate the object five times, once for each query string, or you can use the * wildcard in the invalidation path, as shown in the following example: For more information about using wildcards in the invalidation path, see Invalidation paths.For more information about query strings, see Configuring Cloud Front to Cache Based on Query String Parameters.If you configured Cloud Front to forward a whitelist of headers to your origin and to cache based on the values of the headers, Cloud Front edge caches might contain several versions of the object.
When you invalidate an object, Cloud Front invalidates every cached version of the object regardless of the header values.
The charge to submit an invalidation path is the same regardless of the number of objects you're invalidating: a single object ().
For more information, see Amazon Cloud Front Pricing.
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To determine which query strings are in use, you can enable Cloud Front logging. If the path includes non-ASCII characters or unsafe characters as defined in RFC 1783 ( URL-encode those characters.