I have a website that accepts payments via PayPal. Part of the PayPal process involves the PayPal server sending what is called an Instant Payment Notification (IPN) post to one of my web pages that is not normally seen by anyone. This IPN handler page is designed to process the IPN post and return data to the PayPal server for validation without any user involvement.
There was no particular need to do so, but I used my normal master page when creating the IPN handler page and a recent update to this master page has caused an HTTP error code 500 (Internal Server Error) only when the IPN handler page is activated. The code change was a patch I obtained from an online source to fix a page layout issue with the Safari browser. I don't understand the code (which is shown below) but it works for all my normal pages.
Two questions arise.
Can anyone explain why the patch shown below fails in the particular situation of a pa ...
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