Just use a packet sniffer.
- Download and install packet sniffer.
- Turn it on.
- Check the page successfully with Internet Explorer.
- Check the page unsuccessfully with the script.
- Turn off packet sniffer and inspect the two requests.
The differences in the headers of the two HTTP request-responses will tell you what is going wrong.
The one I use on a Windows client machine is called Smart Sniff.
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