🐛 fix: GTC-3062 implementation replacement on redirect (#176) (#178)

[gtempus]

• 🐛 fix: Only replace implementation with dynamic
• This PR only includes the redirect bug fix found during Natural Forest 2020 testing

Supports FLAG-1126

• ✅ test: add initial pytest suite

• 🎨 refactor: create more declarative methods and tests

• 📝 docs: add docstring to handler

• 📝 docs: add implementation note regarding relative URLs

(cherry picked from commit 8d79ee7)

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