Requests is a mature library, Python urllib is not even able to handle file downloads correctly because it will throw IncompleteRead error, I really don’t understand. Also, keep in mind that its creator already authorized Python to do it.
I would be interested in knowing the reason or why not add requests.
This bug is more than ten years old: How to handle IncompleteRead: in python - Stack Overflow
The idea that every useful library must be added to the stdlib is even older 
There are discussions on this topic that are nearly that old. It’s not as simple a question as you might think.
Well, do you have a solution for the error “IncompleteRead”?
Does pip install requests not work?
I understand, but I have to modify the entire code. Plus I have to import additional libraries. There is no way to continue the download?
If requests were added to the standard library, it would not change either of those things.
requests is a pure-Python project, so we can be sure it is possible. (Okay, perhaps not: maybe that relies on one of its dependencies, which might have its own C code to do it - that takes a lot of work to check.) If you want to know how requests does it, the source code is there. Being more specific than that would require a fair bit of research or analysis - I don’t know if anyone else will want to attempt it for you.
Do you have a reference for this? I thought the maintainer of requests does not want requests to be part of the python stdlib.