Per-call read result with optional MIME-type override.
Use this return shape when a handler needs to override the static
mimeType of the resource/template per call (for example a dynamic
registry that stores entries with different MIME types under one
template URI).
Per-call read result with optional MIME-type override.
Use this return shape when a handler needs to override the static
mimeTypeof the resource/template per call (for example a dynamic registry that stores entries with different MIME types under one template URI).