JwtBearer

JWT Token由以下三部分组成：

• HEADER:ALGORITHM & TOKEN TYPE

   {
    "alg": "HS256",
    "typ": "JWT"
  }

• PAYLOAD:DATA

  {
    "sub": "1234567890",
    "name": "John Doe",
    "iat": 1516239022
  }

• VERIFY SIGNATURE

  HMACSHA256(
    base64UrlEncode(header) + "." +
    base64UrlEncode(payload),
    your-256-bit-secret
  )