Fern linter should treat scheme in securityScheme Object as case-insensitive

[mikekistler]

Which Fern component?

Fern CLI

How urgent is this?

P3 - Low (Nice to have)

What's the issue?

1. Steps to reproduce

• Initialize a fern project with an OpenAPI file that has a security scheme with type: http, scheme: Bearer. Make sure to capitalize the "B" in "Bearer".
• Run fern check

2. Expected behavior

• No errors reported, because the value of the scheme field is case-insensitive. This is per RFC 7235 Section 2.1 and was clarified in the recent 3.0.4 and 3.1.1 point releases of the spec [ref].

3. Actual behavior

• fern check issues this message:

[api]: Failed to convert security scheme {"type":"http","scheme":"Bearer"}

but if the value of scheme is changed to "bearer", fern check completes with no errors
4. Environment

• Docker container: mcr.microsoft.com/devcontainers/dotnet:1-8.0 inside VSCode

Workaround

Use scheme: bearer with lowercase "b".

Logs & Additional Context

No response