Use onError handler for general errors

lib/http-server/http-server.js

@@ -30,7 +30,14 @@ class HttpServer {
     this.server = null
 
     // Initialize the tiny-http app
-    this.app = new App();
+    this.app = new App({
+      // Error handler
+      onError: (err, req, res) => {
+        Logger.error(err.stack, 'HttpServer : general error')
+        const ret = {status: 'Server error'}
+        HttpServer.sendError(res, ret, 500)
+      }
+    });
     this.app.set('trust proxy', 'loopback')
 
     // Middlewares for json responses and requests logging
@@ -50,14 +57,6 @@ class HttpServer {
    * @returns {object} returns the listening server instance
    */
   start() {
-    // Error handler, should be final middleware
-    this.app.use(function(err, req, res, next) {
-      if (res.headersSent) return next(err)
-      Logger.error(err.stack, 'HttpServer : start()')
-      const ret = {status: 'Server error'}
-      HttpServer.sendError(res, ret, 500)
-    })
-
     // Start a http server
     this.server = this.app.listen(this.port, this.host, () => {
       Logger.info(`HttpServer : Listening on ${this.host}:${this.port}`)