Revert back resp.url, introduce resp.url_obj

[asvetlov]

Fix for #1292

[codecov-io]

Current coverage is 98.48% (diff: 100%)

Merging #1295 into master will increase coverage by <.01%

@@             master      #1295   diff @@
==========================================
  Files            29         29          
  Lines          6471       6477     +6   
  Methods           0          0          
  Messages          0          0          
  Branches       1085       1085          
==========================================
+ Hits           6373       6379     +6   
  Misses           47         47          
  Partials         51         51          

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