azure_function_slack_forwarder.js

// npm install node-fetch
const fetch = require('node-fetch');

module.exports = async function (context, req) {
    const body = req.rawBody || JSON.stringify({text: 'Hello World'});

    if(!body) {
        context.log('No request body found.');
        return;
    }
    
    const forwardSlackToUri = 'http://requestbin.net/r/1frjgmd1';
    const slackResponse = await fetch(forwardSlackToUri, {
        method: 'POST',
        body,
        headers: {
            'Content-Type': 'application/json',
        },
    });

    if(!slackResponse.status === 200) {
        context.log.warn(`Non-200 response code returned from Slack webhook target: ${slackResponse.status}`);
    }
};