gistfile1.txt

{ errors: [],
  code: 503,
  message: 'Backend Error',
  response: 
   { _readableState: 
      { highWaterMark: 16384,
        buffer: [],
        length: 0,
        pipes: null,
        pipesCount: 0,
        flowing: false,
        ended: true,
        endEmitted: true,
        reading: false,
        calledRead: true,
        sync: false,
        needReadable: true,
        emittedReadable: false,
        readableListening: false,
        objectMode: false,
        defaultEncoding: 'utf8',
        ranOut: false,
        awaitDrain: 0,
        readingMore: false,
        decoder: null,
        encoding: null },
     readable: false,
     domain: null,
     _events: 
      { end: [Object],
        close: [Object],
        data: [Object],
        readable: [Function],
        error: [Function] },
     _maxListeners: 10,
     socket: 
      { _readableState: [Object],
        readable: true,
        domain: null,
        _events: [Object],
        _maxListeners: 0,
        _writableState: [Object],
        writable: true,
        allowHalfOpen: true,
        pair: [Object],
        _pending: null,
        _pendingEncoding: '',
        _pendingCallback: null,
        _doneFlag: false,
        _retryAfterPartial: false,
        _halfRead: false,
        _sslOutCb: null,
        _resumingSession: false,
        _reading: true,
        _destroyed: false,
        _ended: false,
        _finished: false,
        _opposite: [Object],
        _buffer: [Object],
        _handle: [Object],
        socket: [Object],
        encrypted: [Object],
        authorized: true,
        _controlReleased: true,
        parser: null,
        _httpMessage: [Object],
        ondata: null,
        onend: null,
        npnProtocol: false },
     connection: 
      { _readableState: [Object],
        readable: true,
        domain: null,
        _events: [Object],
        _maxListeners: 0,
        _writableState: [Object],
        writable: true,
        allowHalfOpen: true,
        pair: [Object],
        _pending: null,
        _pendingEncoding: '',
        _pendingCallback: null,
        _doneFlag: false,
        _retryAfterPartial: false,
        _halfRead: false,
        _sslOutCb: null,
        _resumingSession: false,
        _reading: true,
        _destroyed: false,
        _ended: false,
        _finished: false,
        _opposite: [Object],
        _buffer: [Object],
        _handle: [Object],
        socket: [Object],
        encrypted: [Object],
        authorized: true,
        _controlReleased: true,
        parser: null,
        _httpMessage: [Object],
        ondata: null,
        onend: null,
        npnProtocol: false },
     httpVersion: '1.1',
     complete: true,
     headers: 
      { vary: 'X-Origin',
        'content-type': 'text/html; charset=UTF-8',
        date: 'Mon, 15 Jun 2015 23:26:04 GMT',
        expires: 'Mon, 15 Jun 2015 23:26:04 GMT',
        'cache-control': 'private, max-age=0',
        'x-content-type-options': 'nosniff',
        'x-frame-options': 'SAMEORIGIN',
        'x-xss-protection': '1; mode=block',
        server: 'GSE',
        'alternate-protocol': '443:quic,p=1',
        'accept-ranges': 'none',
        'transfer-encoding': 'chunked' },
     trailers: {},
     _pendings: [],
     _pendingIndex: 0,
     url: '',
     method: null,
     statusCode: 503,
     client: 
      { _readableState: [Object],
        readable: true,
        domain: null,
        _events: [Object],
        _maxListeners: 0,
        _writableState: [Object],
        writable: true,
        allowHalfOpen: true,
        pair: [Object],
        _pending: null,
        _pendingEncoding: '',
        _pendingCallback: null,
        _doneFlag: false,
        _retryAfterPartial: false,
        _halfRead: false,
        _sslOutCb: null,
        _resumingSession: false,
        _reading: true,
        _destroyed: false,
        _ended: false,
        _finished: false,
        _opposite: [Object],
        _buffer: [Object],
        _handle: [Object],
        socket: [Object],
        encrypted: [Object],
        authorized: true,
        _controlReleased: true,
        parser: null,
        _httpMessage: [Object],
        ondata: null,
        onend: null,
        npnProtocol: false },
     _consuming: true,
     _dumped: false,
     httpVersionMajor: 1,
     httpVersionMinor: 1,
     upgrade: false,
     req: 
      { domain: null,
        _events: [Object],
        _maxListeners: 10,
        output: [],
        outputEncodings: [],
        writable: true,
        _last: false,
        chunkedEncoding: false,
        shouldKeepAlive: true,
        useChunkedEncodingByDefault: true,
        sendDate: false,
        _headerSent: true,
        _header: 'POST /datastore/v1beta2/datasets/vital-axiom-796/commit HTTP/1.1\r\nContent-Type: application/x-protobuf\r\nAuthorization: Bearer *********************************************************\r\nContent-Length: 30\r\nhost: www.googleapis.com\r\nConnection: keep-alive\r\n\r\n',
        _hasBody: true,
        _trailer: '',
        finished: true,
        _hangupClose: false,
        socket: [Object],
        connection: [Object],
        agent: [Object],
        socketPath: undefined,
        method: 'POST',
        path: '/datastore/v1beta2/datasets/vital-axiom-796/commit',
        _headers: [Object],
        _headerNames: [Object],
        parser: null,
        res: [Circular] },
     request: 
      { domain: null,
        _events: [Object],
        _maxListeners: 10,
        pool: [Object],
        callback: undefined,
        method: 'POST',
        uri: [Object],
        headers: [Object],
        readable: true,
        writable: true,
        explicitMethod: true,
        _qs: [Object],
        _auth: [Object],
        _oauth: [Object],
        _multipart: [Object],
        _redirect: [Object],
        setHeader: [Function],
        hasHeader: [Function],
        getHeader: [Function],
        removeHeader: [Function],
        localAddress: undefined,
        dests: [],
        __isRequestRequest: true,
        proxy: null,
        tunnel: true,
        setHost: true,
        originalCookieHeader: undefined,
        _disableCookies: true,
        _jar: undefined,
        port: 443,
        host: 'www.googleapis.com',
        path: '/datastore/v1beta2/datasets/vital-axiom-796/commit',
        httpModule: [Object],
        agentClass: [Object],
        agent: [Object],
        _started: true,
        href: 'https://www.googleapis.com/datastore/v1beta2/datasets/vital-axiom-796/commit',
        req: [Object],
        ntick: true,
        response: [Circular],
        originalHost: 'www.googleapis.com',
        originalHostHeaderName: 'host',
        responseContent: [Circular],
        _destdata: true,
        _ended: true },
     toJSON: [Function: responseToJSON],
     caseless: { dict: [Object] },
     pipe: [Function],
     addListener: [Function],
     on: [Function],
     pause: [Function],
     resume: [Function],
     read: [Function] } }

test_code.js

var gcloud = require('gcloud');

var dataset = gcloud.datastore.dataset({
  projectId: "vital-axiom-796",
  keyFilename: "dev-cert.json"
});

var key = dataset.key('Test');

dataset.save({
  key : key,
  data : {
    rating : 10
  }
}, function(err) {
  console.log(err || "done");
});