Class RequestEngine

Build a fully-qualified URL from a path (all parameters travel in the body).

POST a JSON payload and parse the JSON reply into T. Every MUDAB endpoint answers with a JSON document, so an empty body (or a 204) is a MudabParseError, not an empty result.

Perform a request with Accept negotiation and transient-error retries.

Redirects are deliberately NOT followed: the canonical host answers directly, and following a cross-origin 3xx blindly is a footgun. A 3xx therefore surfaces as a MudabApiError naming the redirect target (location).

text without the base URL's credentials: server text (an error body that echoes the request URL, the Authorization header or the decoded user:password) and transport text (fetch's "Failed to fetch ") can carry them.