Proxies Imgur links through Google Cloud Functions

imgurProxy.js

var request = require('request');
var IMGUR_API_KEY = '<your key here>';

exports.fetchImage = function fetchImage(req, res) {

    if (req.path === undefined || req.path.length <= 1) {
        res.status(400).send('{"error":"No Data"}');
        return;
    }

    var params = {
        url: 'https://api.imgur.com/3/image/' + req.path,
        headers: {
            "Authorization": 'Client-ID ' + IMGUR_API_KEY
        }
    };

    request.get(params, function(err, response, data) {
        if (err) {
            res.status(500).send('{"error":"Couldn\'t connect to Imgur"}');
            throw new Error("Failed to read Imgur API response: " + JSON.parse(err));
        }

        var img = JSON.parse(response.body);

        if (typeof img.data.link === 'undefined' || img.data.link.indexOf('http') === -1)
            res.status(500).send('{"error":"API error or image not found"}');

        console.log("Fetched " + img.data.link.replace(/\\/g, ""));

        request
            .get(img.data.link.replace(/\\/g, ""))
            .pipe(res, {
                end: true
            });
    });
};