this derivation will be built:
  /nix/store/dqxsdx4j2w5vs5dw5c0bza5jwr6s0i9h-source-salted-qqiw18v8iwdg.drv
building '/nix/store/dqxsdx4j2w5vs5dw5c0bza5jwr6s0i9h-source-salted-qqiw18v8iwdg.drv'...

trying https://httpbin.org/headers
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   238  100   238    0     0    564      0 --:--:-- --:--:-- --:--:--   565
/nix/store/knhdq7na5dfixi7x9d6wjkyl4ccmjn6j-source-salted-qqiw18v8iwdg