A proxy prototype, which measures new-endpoint and fully redirect to new after all passed.

From this article https://engineering.shopify.com/blogs/engineering/how-shopify-reduced-storefront-response-times-rewrite

Requirement:

• Forward to old-endpoint
• Get old result and async forward request, old-response to verifier
• Verifier get response from new-endpoint and return pass/fail to proxy
• Track pass/fail result. And depends on (dynamic) monitor conditions, change to route to new-endpoint
• Fallback to old-endpoint if new-endpoint failed
• Timeout is considered failed, and should be fallback early

Consider:

• Performance, apdex
• Response verification
• Dynamic conditions

Run it

ruby main.rb