Empty host part in the URI is allowed

[OptimumCode]

Based on https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2, the URI might have an empty host part in the authority section.

Resolves #454

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.73%. Comparing base (665f203) to head (27e923a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #455      +/-   ##
==========================================
+ Coverage   90.68%   90.73%   +0.04%     
==========================================
  Files         137      137              
  Lines        4046     4046              
  Branches     1094     1094              
==========================================
+ Hits         3669     3671       +2     
+ Misses         81       80       -1     
+ Partials      296      295       -1     

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