DAP4: Native File Access Service
This service provides direct access to the data source file (or whatever else) that is creating the DAP dataset resource.
The Native File Access service is invoked by appending the suffix
.file to the file part of the dataset's referent (aka base) URL and then dereferencing the new URL.
The request a query string (constraint expression) is not required, and if present it will be ignored.
Returns to the requesting client a copy of the data source file (or whatever else) that is creating the DAP dataset resource.