loading a JSON data file fails if the request includes the ".json" extension

[chillpop]

If your sample request includes the ".json" extension (e.g. getting a file from an FTP site), then loading just a JSON file as the mock response fails. It instead is looking for ".json.json".

[vokal-isaac]

That's as-designed—the file name is based on the full URL, prepended with the scheme, potentially with parameters tacked on the tail end, and with either .json or .http tacked on the end to indicate whether the mock URL protocol should load it as JSON or as a raw HTTP stream.

[chillpop]

Fair enough. I solved my issue by turning the JSON file into a ".http" file.