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请求经过nginx转发到后端服务器, 接口返回结果是

{
    "error": "invalid_request",
    "error_description": "登录超时",
    "code": "300",
    "message": "登录超时"
}

nginx 可能会根据错误码, 把请求转到对应的错误显示页面, 如果此时在nginx.conf中无错误码300对应配置, 就会出现该错误