I see that this is a series and is presumable building to something but I don't think having the /reset route really adds anything to the experience at this point. also the description of the return dict felt a little awkward if it were just given in the dict litteral form of {'toreturn':'whatireturned'} I don't think you would be giving to much away.

That being said I enjoyed it and I'm going to try to go through the rest of this series.

Agreed, and I think another interesting case will be 'https://www.org' from the World Wide Web Consortium

com.net.awwway.com/heywww
mail.google.co.uk
bad.oldsite.geocities.ugh/whatabout_file_extensions.html
so many missing test cases