public async Task GetVerifyCode()
{
Response.ContentType = "image/jpeg";
using (var stream = VerifyCodeHelper.Create(out string code))
{
var buffer = stream.ToArray();
// 将验证码的token放入cookie
Response.Cookies.Append(VERFIY_CODE_TOKEN_COOKIE_NAME, await SecurityServices.GetVerifyCodeToken(code));
await Response.Body.WriteAsync(buffer, 0, buffer.Length);
}
}