How does one discern HOW a site is blocking?

[dwhempy]

How does one go about determining how a site is preventing access? I've been to httpbin.org and looked through the data there but (and I'll admit to a shallow understanding of things) I'm not seeing anything obvious when I compare manually opening the site versus using Python/Selenium/UC. I'm hoping that knowing which blocking method will lead to some sort of method to get around it.

I am trying to access a financial site so I expect it to be difficult. I'm just looking to login to my account, grab a screenshot, and e-mail it. Python 3.9 and Chrome 111.

[pulth]

I want to know this too. I'm currently being detected by https://prenotami.esteri.it/ after log in and don't know why. I'm new to this package so any ideas are welcome.

Following image shows the error I get after trying an automated log in: