HashRouter is affecting axios calls

[javaspeak]

I am using a HashRouter in a chrome extension.

Somehow when I make an axios call it is appending the chrome extension url:

The url in the network tab looks like:

axios.cjs:2405 POST chrome-extension://oahhaapnfpkfnbgeopliehfgenifngde/'http://localhost:8080';/api/v1/register/initialdata net::ERR_FILE_NOT_FOUND

It should instead have been:

http://localhost:8080/api/v1/register/initialdata

It is a bit bizzare that the HashRouter is somehow intercepting axios - does anyone know about this?