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Proxy経由でWatson Assistantに接続する方法(JavaScript)

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#はじめに
アプリケーションからProxy経由でWatson Assistantに繋ぎたい。
本来はAssistantサービスのインスタンス化時にProxyの設定を入れれば可能らしいが、うまくいかない。
どうもSDKのバグのようで、現在fix申請中だが、SDKを修正することで解決したのでその方法について記載する。

#環境
Watson Assistant V1 2019-02-28
Node.js 12.5.0

#tunnelのinstall

npm install tunnel

#SDKの修正
npm install ibm-watsonするとインストールされるnode_modules/ibm-cloud-sdk-core/lib/requestwrapper.jsに以下のコードを追加する。

先頭に

requestwrapper.js
var tunnel = require("tunnel");

axios_1.default.createに

requestwrapper.js
var agent = tunnel.httpsOverHttp({
         proxy: {
             host: 'XXX.XXX.XXX.XXX',
             port: YYYY,
         },
     });

     axiosConfig.httpsAgent = agent;
     axiosConfig.proxy = false;

     this.axiosInstance = axios_1.default.create(axiosConfig);

#参考情報
createSession from Assistant V2 is not working behind http proxy
IBM Cloud API Docs Watson Assistant v1

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