Refactored the legal url comparison

[dlundgren]

Fixes #55 by restoring some of the logic from the pre-rc3 code for service validation.

[pradtke]

Thanks for all these contributions @dlundgren . I'm out of office until middle of next week and then I can review this, and your other PRs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.72%. Comparing base (008050c) to head (e25c7c0).
⚠️ Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #59   +/-   ##
=========================================
  Coverage     66.72%   66.72%           
- Complexity      349      351    +2     
=========================================
  Files            26       26           
  Lines          1190     1190           
=========================================
  Hits            794      794           
  Misses          396      396           

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