Extremely strange Web-Scraping issue: Post request not behaving as expected?

Read and re-read your post and the other folks answers a few times. My thoughts.

I think that the PHP script is erroring out and not displaying anything because your form data is not exactly identical. Try replicating a post request to be completely identical including all the values. I see that the line-based text data on your Wireshark screenshot for the browser includes parameters such as SegmentPosition which is 0, but in your Python screenshot does not have a value for SegmentPosition.

The format for some of the parameters such as Segment seem different between the Browser and the Python request which may be causing an error as it tries to parse it.

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