It must be solved immediately.
Receipt validation failing due to this problem.
Response is:
<!DOCTYPE html>
<html lang="en">
<head>
		<style>
				body {
						font-family: "Helvetica Neue", "HelveticaNeue", Helvetica, Arial, sans-serif;
						font-size: 15px;
						font-weight: 200;
						line-height: 20px;
						color: #4c4c4c;
						text-align: center;
				}
				.section {
						margin-top: 50px;
				}
		</style>
</head>
<body>
<div class="section">
		<h1></h1>
		<h3>Bad Gateway</h3>
		<p>Correlation Key: XXXXXXXXX</p>
</div>
</body>
</html>
hakki_konu_imo
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https://buy.itunes.apple.com/verifyReceipt return 502 bad gataway error and this is an important issue.
We can not validation purchases.