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400 error on validate IPN

Hello! Sometimes we are getting 400 error from paypal when validating notification. But if i make the same request after some time it works correctly. Please check the response from paypal:

 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Your browser sent a request that this server could not understand.<br />
</p>
</body></html>

 

I can not provide request, because it contains private information.

It happens only in 1-3% of requests.

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