Update requirements, .gitignore, and normalize URLs with trailing slash

[denini08]

Hello! This PR brings a few small improvements to make the project easier to run and to follow a standard recommended by the Requests library.

Changes:

• Updated requirements to ensure all necessary dependencies are installed.
• Updated .gitignore to ignore unnecessary files from env
• Updated the code to always terminate full hostnames with a /, following the Requests recommendation:

"It’s recommended to terminate full hostnames with a /."

Reference:
https://requests.readthedocs.io/en/latest/user/advanced/

These changes improve consistency and help avoid potential issues when making HTTP requests.