Can I use a proxy server in front of Varnish to mitigate this error?

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Grade: Education Subject: Support
Can I use a proxy server in front of Varnish to mitigate this error?
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Yes, using a reverse proxy in front of Varnish can sometimes help. The proxy can handle the initial connection to PayPal, authenticate the request, and then forward the payment data to Varnish for caching. This can shield Varnish from direct issues with the PayPal API and provide an extra layer of security.