// that have an x-ignore- prefix) must appear in the list of conditions."
// https://docs.aws.amazon.com/AmazonS3/latest/API/sigv4-HTTPPOSTConstructPolicy.html
// keyInPolicyExceptions - list of keys that, when present in the form, can be missing in the conditions of the policy.
var keyInPolicyExceptions = map[string]bool{
	xhttp.AmzSignature: true,
	"File":             true,
	"Policy":           true,