From 4e9ff3cb8f9266c4d2d24c77fc48cd2663e160b5 Mon Sep 17 00:00:00 2001
From: Kohei Watanabe <kou029w@gmail.com>
Date: Fri, 17 Jul 2020 20:07:32 +0900
Subject: [PATCH] =?UTF-8?q?fix:=20=E5=86=8D=E8=A9=A6=E8=A1=8C=E6=8A=91?=
 =?UTF-8?q?=E5=88=B6?=
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---
 app.js | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/app.js b/app.js
index 926a767..c2a6f75 100644
--- a/app.js
+++ b/app.js
@@ -1,10 +1,30 @@
-const { App } = require("@slack/bolt");
+const { promisify } = require("util");
+const { App, ExpressReceiver } = require("@slack/bolt");
 const daraz = require("./");
 
+class Receiver extends ExpressReceiver {
+  /**
+   * @param {import("express").Request} req
+   * @param {import("express").Response} res
+   */
+  requestHandler(req, res) {
+    // NOTE: See also https://api.slack.com/events-api#errors
+    res.header("x-slack-no-retry", "1");
+    if (req.headers["x-slack-retry-reason"] === "http_timeout")
+      return promisify(res.end)();
+
+    return super.requestHandler(req, res);
+  }
+}
+
+const receiver = new Receiver({
+  signingSecret: process.env.SLACK_SIGNING_SECRET,
+});
+
 const app = daraz(
   new App({
     token: process.env.SLACK_BOT_TOKEN,
-    signingSecret: process.env.SLACK_SIGNING_SECRET,
+    receiver,
   })
 );