fix: basic authentication error with react

[VmMad]

Description of change

Fixes #1460

Type of change

Choose a type of change, and delete any options that are not relevant.

• Bug fix (a non-breaking change which fixes an issue)

How the change has been tested

http://example:example@localhost:3000/mainnet

Change checklist

Add an x to the boxes that are relevant to your changes, and delete any items that are not.

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• [] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [] I have added tests that prove my fix is effective or that my feature works
• [] New and existing unit tests pass locally with my changes

[brancoder]

LGTM