发送了无法转化的请求体，400 状态码

  HTTP/1.1 400 Bad Request
  Content-Length: 35
  {"message": "Problems parsing JSON"}

因为某些原因不允许访问（比如被 ban ），403 状态码

  HTTP/1.1 403 Forbidden
  Content-Length: 29
  {"message": "Account blocked"}

  Content-Length: 32
  {"message": "Resource not found"}

缺少了必要的头信息，428 状态码

发送了非法的资源，422 状态码

  HTTP/1.1 422 Unprocessable Entity
  Content-Length: 149
  {
    "errors": [
      {
        "resource": "Issue",
        "code": "required"
      }
    ]
  }