iisnode encountered an error when processing the request.

HRESULT: 0x6d
HTTP status: 500
HTTP subStatus: 1013
HTTP reason: Internal Server Error

You are receiving this HTTP 200 response because system.webServer/iisnode/@devErrorsEnabled configuration setting is 'true'.

In addition to the log of stdout and stderr of the node.exe process, consider using debugging and ETW traces to further diagnose the problem.

The last 64k of the output generated by the node.exe process to stderr is shown below:

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ERROR HttpErrorResponse {
  headers: HttpHeaders {
    normalizedNames: Map(0) {},
    lazyUpdate: null,
    lazyInit: [Function (anonymous)]
  },
  status: 503,
  statusText: 'Service Unavailable',
  url: 'https://hotel-api-v1.utravs.com/Hotel/availabilityseo/GetHotelAvailabilitySeo',
  ok: false,
  name: 'HttpErrorResponse',
  message: 'Http failure response for https://hotel-api-v1.utravs.com/Hotel/availabilityseo/GetHotelAvailabilitySeo: 503 Service Unavailable',
  error: '<!DOCTYPE html>\n' +
    '<html lang=en>\n' +
    '  <meta charset=utf-8>\n' +
    '  <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">\n' +
    '  <title>Service Unavailable!!!</title>\n' +
    '  <style>\n' +
    '    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}\n' +
    '  </style>\n' +
    '  <body>\n' +
    '  <p><b>Service Unavailable</b>\n' +
    '  <p><ins>"The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."</ins>\n' +
    '  </body>\n' +
    '</html>  \n' +
    '\n'
}
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