failed to fetch

[pioneerlfn]

Access to fetch at 'http://api.github.com/user' from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.

[11F8]

add https: can fix it.

fetch('https://api.github.com/user', {
			headers: {
				// Include the token in the Authorization header
				Authorization: 'token ' + token
			}
		})
		// Parse the response as JSON
		.then(res => res.json())
		.then(res => {
			console.log(res)
			// Once we get the response (which has many fields)
			// Documented here: https://developer.github.com/v3/users/#get-the-authenticated-user
			// Write "Welcome <user name>" to the documents body
			const nameNode = document.createTextNode(`欢迎登录, ${res.name}`)
			document.body.appendChild(nameNode)
		})

[Jason Salas]

Agreed. I had the same error blocking the call to fetch() in welcome.html, but adding the protocol to HTTPS fixes it (since many people don't use secure certificate on localhost).