web_sys Response is opaque.

[greenpdx]

Summary

I copied the web_sys fetch example and only changed the URL and the Accept to "application/json" and console::log_1() statements
I am running the WASM inside a VueJS application in a Firefox. I see the json data in the network debugger.

right after the "let resp_value = ....." the result is an opaque response.

Why is this and how do I fix it?