Checks for the existence of the requested resource in the configured list of locations. If the resource does not exist, a {@code 404} response will be returned to the client.If the resource exists, the request will be checked for the presence of the {@code Last-Modified} header, and its value will be compared against the last-modifiedtimestamp of the given resource, returning a {@code 304} status code if the{@code Last-Modified} value is greater. If the resource is newer than the{@code Last-Modified} value, or the header is not present, the content resourceof the resource will be written to the response with caching headers set to expire one year in the future.
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