Hopefully you figured this out by now, but I thought I'd add something here for anyone else with a similar issue. I had the same problem.
On the
https://www.strava.com/settings/api page, there is a link to your 'OAuth Authorization Page'. After visiting that link I found you need to add the 'http://' in front of localhost. So your particular request would be:
Also you have a issue in your scope parameter. It looks like you have a space, but it needs to be a comma %2C.
Hope this helps people in the future.