Modify endpoint URL generation in Url function

[Yang-33]

Fix #396

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f530088) 55.75% compared to head (283d9e2) 55.75%.

❗ Current head 283d9e2 differs from pull request most recent head 50e6fd1. Consider uploading reports for the commit 50e6fd1 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #397   +/-   ##
=======================================
  Coverage   55.75%   55.75%           
=======================================
  Files          86       86           
  Lines        5406     5406           
=======================================
  Hits         3014     3014           
  Misses       2172     2172           
  Partials      220      220           

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[tokuhirom]

I really appreciate all of your help! Thank you so much!