Tutorial error about fetching data

This is about:

• Innaccurate/misleading documentation (e.g. technically incorrect advice)

https://yew.rs/zh-Hans/docs/tutorial#fetching-data-using-external-rest-api

When I follow the tutorial to pull data, it always fails. After I put the data locally and modify the port, it sometimes succeeds, but most of the time it fails. Please correct this error.