Minor change to make fetch work

[3willows]

Closes #

Description

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[benjie]

Thank you for contributing! However, I'm not sure this is the right change:

• Assuming you're serving the code from http://localhost:4000 this should not be needed.
• If you're not serving the code from http://localhost:4000 then there are all sorts of additional concerns that we'd need to address, such as CORS.

Perhaps a clarifying note to state that this code must be served from your server at http://localhost:4000 would be a better solution?