redirect function doesn't work
I'm just trying to redirect page to user page after signup, when I use `ctx.redirect`, all the function does is just sending GET request to the url and not actually redirect the tab to the url from where It was.. Here's code.


**signup**

    router.post('/signup', async (ctx, next) => {
    	let data = ctx.request.body
    	const param = await makeParam(data)
    
    	try {
    		const user = new User(param)
    		await user.save()
    		ctx.redirect(`/u/${data.username}`)
    	} catch (e) {
    		console.error("Failed to save post request", e, param)
    	}
    })


Let's say username was `edqwedqwedqwed`, then it's supposed to redirect the page to `/u/edqwedqwedqwed` but as you can see below It only sends GET request to the url and does nothing

 
```
  --> POST /signup 302 131ms 65b
  <-- GET /u/edqwedqwedqwed
  --> GET /u/edqwedqwedqwed 200 806ms 25.52kb
```