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quickandeasy says

I received an email from PayPal this morning informing me I may need to update my IPN scripts, I thought I would share this information here for any of you selling PayPal related items that may need updating:

To improve our site’s performance, scalability and availability, we’re going to expand the number of IP addresses for www.paypal.com. We announced this in a bulletin on October 18, 2011. As part of this expansion, we’ll discontinue support for the HTTP 1 .0 protocol on February 1, 2013.

If your IPN (Instant Payment Notification) or PDT (Payment Data Transfer) scripts use the HTTP 1 .0 protocol, this change may impact your ability to perform IPN post-back validation or PDT posts to www.paypal.com.

Additional Details

Starting February 1, 2013, we’ll require all incoming requests to have a “Host” header which complies with HTTP 1 .1 specifications. This header was not required with the HTTP 1 .0 protocol. IPN and PDT scripts using HTTP 1 .0 may start failing with “HTTP/1.0 400 Bad Request” errors after February 1, 2013, which will result in IPN messages not being validated successfully, or PDT scripts not being able to retrieve transaction information.

Action Required before February 1, 2013

If your IPN (Instant Payment Notification) or PDT (Payment Data Transfer) scripts use the HTTP 1 .0 protocol, you’ll need to update your scripts to HTTP 1 .1, and include the “Host” header in the IPN postback script.
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aaranmcguire says

You do know that means nothing to most people… haha.

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quickandeasy says

haha! Just thought I’d post it see if it meant anything to CC authors

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Joost Moderator says

Thanks for the heads-up, Adam :)

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MikeMoloney says

It means something to me Adam ;) Lol, just kidding, but seriously good looking out! I am sure there are plenty of people who may not have known this, but need to know this!

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