Include port in X-Forwarded-Host header if not default

[jwgmeligmeyling]

Fixes #122.

After looking into it a bit better the resources are quite contradicting each other on whether the port should be in the header or not.

Perhaps we could at least make the behaviour configurable to support both flavors?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.81%. Comparing base (f6311c9) to head (fae1a4b).
⚠️ Report is 35 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #124   +/-   ##
=========================================
  Coverage     90.80%   90.81%           
  Complexity      542      542           
=========================================
  Files           167      167           
  Lines          1849     1851    +2     
  Branches         54       55    +1     
=========================================
+ Hits           1679     1681    +2     
  Misses          148      148           
  Partials         22       22           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.