400 Bad Request: malformed HTTP version in IPN validation (Production issue)

chaver
New Community Member

I have been using IPNs for many years now and as of a few weeks ago I started getting the following response during IPN validation instead of the expected VALID or INVALID.

 

Once again my code has not changed and I am calling http 1.1.

 

Does anyone have any suggestions of what might be causing this?

Thanks

 

Note: I realized I put this in Sandbox Environment discussion but this is happening in PRODUCTION

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