chore: add rack docs

pact-foundation · Apr 24, 2024 · 60245c9 · 60245c9
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+# Rack
+
+https://medium.com/quick-code/rack-middleware-vs-rack-application-vs-rack-the-gem-vs-rack-the-architecture-912cd583ed24
+https://github.com/rack/rack/blob/main/SPEC.rdoc
+https://www.rubyguides.com/2018/09/rack-middleware/
+
+
+* Responds to `call`
+* Accepts a hash of parameters
+* Returns an array where the first item is the http status, the second is a hash of headers, and the third is an object that responds to `each` (or `call`) that provides the body (99% of the time it's an array of length 1 with a string)
+