Return error when client headers are missing (issue #19)

Return an error response when headers are missing instead of waiting indefinitely

ExpressAPI/src/express/API.ts

@@ -38,7 +38,9 @@ class API implements WorkerTask {
 
     private initBaseMiddlewares() {
         this.backend.use(multer({
-                                    limits: { fieldSize: 15 * 1024 * 1024 }
+                                    limits: {
+                                        fieldSize: 15728640 // 15MB
+                                    }
                                 }).none()); //Used for extract params from body with format "form-data", The none is for say that we do not wait a file in params
         this.backend.use(morganMiddleware); //Log API accesses
         this.backend.use(helmet()); //Help to secure express, https://helmetjs.github.io/