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http4s quiz

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What is a reasonable general criterion for a Scala team deciding whether http4s's functional style is the right fit for a new HTTP service, versus a more conventional framework?

Questions in this quiz
  1. What is a reasonable general criterion for a Scala team deciding whether http4s's functional style is the right fit for a new HTTP service, versus a more conventional framework?
  2. How are routes commonly defined and pattern-matched in http4s?
  3. What is a general reason understanding Scala's type class pattern (used pervasively in http4s, like `EntityDecoder`) is useful background before working extensively with the library?
  4. What does it mean that http4s is built to be "backend-agnostic" with respect to the underlying HTTP server implementation (blaze, ember, etc.)?
  5. What does http4s's "middleware" concept typically enable, similarly to middleware in other web frameworks?
  6. Why might a team choose http4s specifically for a service where composability and long-term maintainability of complex request-handling logic (many nested routes, cross-cutting middleware) are significant concerns?
  7. How does http4s typically support decoding a request body (like JSON) into a typed Scala value?
  8. Why might strong typing throughout http4s's API (routes, requests, responses, decoders) offer a compile-time safety benefit over a more loosely-typed HTTP framework?
  9. What is an `HttpRoutes[F]` in http4s, at a conceptual level?
  10. How does composing multiple `HttpRoutes[F]` values together (e.g. via `<+>` in http4s) typically work?
  11. What is a general trade-off consideration when adopting http4s's purely functional approach compared to a more conventional, imperative Scala web framework (like Play in its more traditional usage)?
  12. What is a practical benefit of http4s's design encouraging small, focused, composable pieces (routes, middleware, decoders) over one large monolithic handler?
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