Swagger quiz

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What does an OpenAPI "path" definition (like `/users/{id}`) describe, and how does it handle a path parameter like `{id}`?

1. What does an OpenAPI "path" definition (like `/users/{id}`) describe, and how does it handle a path parameter like `{id}`?
2. What is a reasonable way to think about the relationship between writing an OpenAPI specification and actually implementing the API it describes — does having a spec automatically guarantee the implementation matches it?
3. What is a general tradeoff/consideration when choosing whether to describe an API using OpenAPI/Swagger (for a REST API) versus not investing in this kind of formal specification at all for a small, simple, internal-only API?
4. What does an OpenAPI specification's "schema" definitions (describing the shape of a request/response body, like a `User` object's properties and types) provide beyond just documentation value?
5. What is a common way an OpenAPI specification describes an API's authentication requirements, e.g. that a particular endpoint requires a Bearer token?
6. What is "Swagger UI," and what does it provide for an API described by an OpenAPI document?
7. What does "API versioning" documentation look like within an OpenAPI specification, and why might a team maintain SEPARATE OpenAPI documents for different API versions (like v1 and v2)?
8. What is a general benefit of maintaining an API's OpenAPI specification as the SOURCE OF TRUTH for that API's documentation, rather than writing/maintaining documentation as a completely separate, manually-updated document?
9. What is the difference between a "design-first" and a "code-first" approach to creating an OpenAPI specification for a new API?
10. What is "Swagger Codegen" (or the related OpenAPI Generator project), and what does it produce from an OpenAPI specification?
11. What is a general reason a company's public, externally-facing API (used by third-party developers) would specifically benefit from a well-maintained, published OpenAPI specification and interactive Swagger UI documentation?
12. What is Swagger, and how does it relate to the OpenAPI Specification?

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