HTTP protocol doesn't follow redirect

[nsmith-]

I cannot open

uproot4.open("https://github.com/CoffeaTeam/coffea/raw/master/tests/samples/nano_dy.root")

yet I can open the place it 302 redirects to:

uproot4.open("https://raw.githubusercontent.com/CoffeaTeam/coffea/master/tests/samples/nano_dy.root")

[jpivarski]

Adding my comment from Slack, for the record:

This is a missed case:

https://github.com/scikit-hep/uproot4/blob/d8a4b7203952bb7bd85cbf6d2ed481d610c83e67/uproot4/source/http.py#L163-L174

doesn't check for response.status == 302 (redirect) and use the connection to try again at response.headers["location"].

Same for:

https://github.com/scikit-hep/uproot4/blob/d8a4b7203952bb7bd85cbf6d2ed481d610c83e67/uproot4/source/http.py#L244

which only returns True or False based on whether the status is 206 or not. This should be an issue asking to support redirects.

On the second issue of not being able to access the redirected file: I wasn't able to the first time, then I was every subsequent time. I verify that I can read the data in it. I don't know if this was a one-time GitHub thing or if it always needs to "warm up," or what.

[maxnoe]

When you are at it, please don't forget the other redirect status codes:

https://en.wikipedia.org/wiki/List_of_HTTP_status_codes#3xx_redirection