Cookies Go Missing when they're set before a redirect

[SaulDoesCode]

air.GET("/auth/:verifier", func(req *air.Request, res *air.Response) error {
    user, err := VerifyUser(req.Param("verifier").Value().String())
    if err != nil || user == nil {
        if DevMode {
            fmt.Println("Unable to Authenticate user: ", err)
        }
        return UnauthorizedError.Send(res)
    }

    newtoken, err := GenerateAuthToken(user, false)
    if err == nil {
// This Cookie never reaches the client
        res.SetCookie("Auth", &air.Cookie{
            Value:    newtoken,
            Path:     "/",
            MaxAge:   60 * 60 * 24 * 7,
                        Domain: AppDomain,
            HTTPOnly: !DevMode,
            Secure:   !DevMode,
        })
    } else {
        if DevMode {
            fmt.Println("error verifying the user, GenerateAuthToken db problem: ", err)
        }
    }

    if user.isAdmin() {
        return res.Redirect("/admin")
    }
    return res.Redirect("/")
})

the problem is probably somewhere in res.Write, but it looks like the Header application step of serving is ignored when content io.ReadSeeker is nil, or something else is happening, not sure. But I need cookies to set on redirects, it worked in echo, it should work here.

[aofei]

I think this problem may be caused by the status 302 that Air automatically sets. See https://stackoverflow.com/a/4696017/5801959.

[aofei]

I tested it. It works fine in Chrome. But can't in Safari.

[aofei]

See request/request#1502.

[SaulDoesCode]

I tested it just now, and it seems if you use *http.Cookie and the conventional go way of setting cookies, then this problem is solved. The handler above works in mak for some reason.