What is the fastest way to do 400 HTTP requests using requests library?

[Paul Rubin]

Steven D'Aprano <steve at pearwood.info> writes:
> Maybe they're stress-testing a web server, or they just want to download
> things in a rush.

They're stress-testing a web server through a tor proxy?  This sounds
abusive to me.

I also wonder whether 400 referred to the HTTP 400 error code rather
than the number of requests to be sent.  As in:

    - Layer 7 (“400 bad request”) attacks toward our web and application
      servers, causing Linode Manager outages

from http://status.linode.com/incidents/mmdbljlglnfd
regarding a big DDOS attack that's been running against Linode.com
(a VPS host) over the past couple weeks.