Having problems with busboy and not finding Content-Type

I'm having hard times with this package of busboy in some app I'm trying to build wanting to upload images from/to my firebase... Already tried to look at some of your possible solutions with the same problems but perhaps different code and it didn't work. May I share mine, so you might give me an idea about what is going wrong? Here the lines:

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp()
const path = require('path');
const os = require('os');
const cors = require('cors')({ origin: true });
const BusBoy = require('busboy')
const fs = require('fs');
const gcConfig = {
    projectId: 'meeting-scheduler-9cee1',
    keyFilename: "meeting-scheduler-9cee1-firebase-adminsdk-3unr4-09df5fe69a.json"
}
const { Storage } = require("@google-cloud/storage");


exports.upLoadFile = functions.https.onRequest((request, response) => {
    cors(request, response,() => {
        const busBoy = new BusBoy({ headers: request.headers});
        let uploadData = null;
        if (request.method !== "POST") {
            return response.status(500).json({
                message: 'Not Allowed!!'
            })
        }

        // if (!request.headers['Content-Type']){
        //     return next(new Error('Bad request'));
        // }
        //   else
        //    next();

        busBoy.on('file', (fieldname, file, filename, encoding, mimetype) => {
            const filepath = path.join(os.tmpdir(), filename);
            uploadData = { file: filepath, type: mimetype };
            file.pipe(fs.createWriteStream(filepath));
        });
        busBoy.on('finish', () => {
            const bucket = gcs.bucket('meeting-scheduler-9cee1.appspot.com');
            bucket
                .upload(uploadData.file, {
                    uploadType: 'media',
                    metadata: {
                        metadata: {
                            contentType: uploadData.type
                        }
                    }
                })
                .then(() => {
                    response.status(200).json({
                        message: 'It Works!'
                    });
                })
                .catch(err => {

                    response.status(500).json({
                        error: err
                    })
                })
    });
    busBoy.end(request.rawBody);


});

}); 

Any time I fire the function in my firebase de error is the same,I'm sharing it too:

Error: Missing Content-Type
    at new Busboy (/srv/node_modules/busboy/lib/main.js:23:11)
    at cors (/srv/index.js:58:24)
    at cors (/srv/node_modules/cors/lib/index.js:188:7)
    at /srv/node_modules/cors/lib/index.js:224:17
    at originCallback (/srv/node_modules/cors/lib/index.js:214:15)
    at /srv/node_modules/cors/lib/index.js:219:13
    at optionsCallback (/srv/node_modules/cors/lib/index.js:199:9)
    at corsMiddleware (/srv/node_modules/cors/lib/index.js:204:7)
    at exports.upLoadFile.functions.https.onRequest (/srv/index.js:57:5)
    at cloudFunction (/srv/node_modules/firebase-functions/lib/providers/https.js:49:9)

Ran into this myself. Turns out, main.js in the busboy module checks for content-type instead of Content-Type, and thus does not find the header. Confirmed this was the issue by fixing the casing in main.js (which isn't a feasible solution in most cases), after which the constructor call worked on my request, as expected.

Apparently this was brought up before, but the issue was closed (link).