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node.jsのrequestモジュールでContent-Type: application/jsonのHTTP POSTリクエストを行う

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背景

FCM (Firebase Cloud Messaging) を利用してプッシュ通知を行う Android/iOS アプリを作成したので、node.js の request モジュールを利用して FCM Server への HTTP POST リクエストを行い動作確認しようとしたところ、期待したメッセージが届かない。。。

FCM Server リクエストフォーマット

https://firebase.google.com/docs/cloud-messaging/server より

HTTP-header
Content-Type: application/json
json-example
{ "data": {
    "score": "5x1",
    "time": "15:10"
  },
  "to" : "bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1..."
}

失敗例

bad.js
var request = require('request');

require('date-utils');
var date = new Date();
var dateString = date.toFormat("YYYY-MM-DD HH24:MI:SS");

var url = 'https://fcm.googleapis.com/fcm/send';
var serverkey = 'AIzaSyZ-1u...0GBYzPu7Udno5aA';
var token = 'bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...';

// data payload
var data = {
  message: 'Hello!',
  date: dateString
};

// HTTP header
var headers = {
  'Content-Type': 'application/json',
  'Authorization': 'key=' + serverkey
};

// request options
var options = {
  url: url,
  method: 'POST',
  headers: headers,
  form: {
    'to': token,
    'data': data
  }
};

request(options, function (error, response, body) {
  if (body) {
    console.log(body);
  }
  if (error) {
    console.log(error);
  }
});

実行結果

Anddroid アプリで受け取ったメッセージのdataを確認したところ、下記のようにkeyに]がついている。

{message]=Hello!, date]=2016-08-12 22:45:45}

送信したHTTPリクエストの確認

localhost 宛にリクエストを送信しパケットキャプチャで確認したところ、以下のようなリクエストを送信していた。

POST / HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Authorization: key=SERVER_KEY
host: localhost:3000
content-length: 83
Connection: keep-alive

to=DEVICE_TOKEN&data%5Bmessage%5D=Hello%21&data%5Bdate%5D=2016-08-12%2022%3A39%3A47

Content-Type が application/x-www-form-urlencoded になっており、body も JSON になっていない。。。

成功例

request options に form ではなく、json を利用する。

good.js
var request = require('request');

require('date-utils');
var date = new Date();
var dateString = date.toFormat("YYYY-MM-DD HH24:MI:SS");

var url = 'https://fcm.googleapis.com/fcm/send';
var serverkey = 'AIzaSyZ-1u...0GBYzPu7Udno5aA';
var token = 'bk3RNwTe3H0:CI2k_HHwgIpoDKCIZvvDMExUdFQ3P1...';

// data payload
var data = {
  message: 'Hello!',
  date: dateString
};

// HTTP header
var headers = {
  'Content-Type': 'application/json',
  'Authorization': 'key=' + serverkey
};

// request options
var options = {
  url: url,
  method: 'POST',
  headers: headers,
  json: {
    'to': token,
    'data': data
  }
};

request(options, function (error, response, body) {
  if (body) {
    console.log(body);
  }
  if (error) {
    console.log(error);
  }
});

実行結果

{date=2016-08-12 22:46:11, message=Hello!}

HTTP リクエスト

POST / HTTP/1.1
Authorization: key=SERVER_KEY
host: localhost:3000
accept: application/json
content-type: application/json
content-length: 78
Connection: keep-alive

{"to":"DEVICE_TOKEN","data":{"message":"Hello!","date":"2016-08-12 22:41:36"}}

おわりに

ちゃんとドキュメントを読みましょう。
https://github.com/request/request

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