Method Resolve

proxy/internal/middleware/registry.go:102–121

Resolve builds a Middleware instance and merges runtime-only fields (version, accepted content types, metadata key allowlist, mutation support) onto the spec. Return semantics: - (mw, mergedSpec, nil): instance built, include in chain. - (nil, spec, nil): id not registered; silently skip. - (nil, s

(spec Spec)

//   - (nil, spec, err): factory rejected the config (logged + counted
//     by Manager, other middlewares still bind).
func (r *Resolver) Resolve(spec Spec) (Middleware, Spec, error) {
	f := r.registry.Get(spec.ID)
	if f == nil {
		return nil, spec, nil
	}
	mw, err := f.New(spec.RawConfig)
	if err != nil {
		return nil, spec, fmt.Errorf("middleware %s factory: %w", spec.ID, err)
	}
	if mw.Slot() != spec.Slot {
		_ = mw.Close()
		return nil, spec, fmt.Errorf("middleware %s slot mismatch: spec=%d impl=%d", spec.ID, spec.Slot, mw.Slot())
	}
	merged := spec
	merged.Version = mw.Version()
	merged.MetadataKeys = append([]string(nil), mw.MetadataKeys()...)
	merged.AcceptedContentTypes = append([]string(nil), mw.AcceptedContentTypes()...)
	merged.MutationsSupported = mw.MutationsSupported()
	return mw, merged, nil
}