Server responses with status 400 for "fetch approaches" examples

[Vasilii Kovalev]

All the three examples have the issue.

"fetch-on-render" example on production environment.

[Kent C. Dodds]

@all-contributors please add @vasilii-kovalev for bugs

[allcontributors]

@kentcdodds

I've put up a pull request to add @vasilii-kovalev! 🎉