Merge tag 'content-type' into next

Patch content-type

lib/webserver/routes.js

@@ -23,6 +23,7 @@ const uuidv1 = require('uuid/v1');
 
 const successCode = 200;
 const badRequestCode = 400;
+const noContentTypeCode = 406;
 const interalServerCode = 500;
 
 const routesFactory = config => {
@@ -37,6 +38,10 @@ const routesFactory = config => {
       return res.status(badRequestCode).send('No files were uploaded.');
     }
 
+    if (req.get('content-type') === undefined) {
+      return res.status(noContentTypeCode).send('No content type given');
+    }
+
     enhancer.enhancement(req.body, (err, response, body) => {
       if (err) {
         return res.status(interalServerCode).json({module: 'Enhancement', error: 'Error during audio enhancing', info: err.toString()});