Configure backend like http.DefaultTransport
Configure backend like http.DefaultTransport

There are some sensible settings which we are not setting by using a
custom transport instead of the default transport.

I have either configured them using a slightly arbitrarily selected
value, or used the values from http.DefaultTransport

Signed-off-by: Toby Lorne <527052641d65eef236eeef9545b2acac74c35d57@digital.cabinet-office.gov.uk>

alphagov/router