Make fetch redirect mode to follow as default to fit the standard.

[xuqingkuang]

It's manual as default redirect mode so far, but it's a mistake.

Should be 'follow'.

https://fetch.spec.whatwg.org/#concept-request-redirect-mode

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[github-actions[bot]]

🤖: "Pay attention 🛎️ !! There has been no activity on this PR for 2 months, so I will label it stalled. It will be automatically closed in 30 days if no more activity. Feel free to leave a comment if you have any questions."

[hippy-service[bot]]

Sorry, closing this PR because it has stalled for over 4 months. Feel free to reopen if this PR is still relevant, or to ping the collaborator if you have any questions.