add error handlers to requests and sockets

Trying to flush out cause of sporadic socket failures and identify which
socket is not being handled.

server.js

@@ -301,6 +301,15 @@ module.exports = function(opt) {
     const server = http.createServer();
 
     server.on('request', function(req, res) {
+
+        req.on('error', (err) => {
+            console.error('request', err);
+        });
+
+        res.on('error', (err) => {
+            console.error('response', err);
+        });
+
         debug('request %s', req.url);
         if (maybe_bounce(req, res, null, null)) {
             return;
@@ -310,6 +319,14 @@ module.exports = function(opt) {
     });
 
     server.on('upgrade', function(req, socket, head) {
+        req.on('error', (err) => {
+            console.error('ws req', err);
+        });
+
+        socket.on('error', (err) => {
+            console.error('ws socket', err);
+        });
+
         if (maybe_bounce(req, null, socket, head)) {
             return;
         };

test/basic.js

@@ -28,16 +28,8 @@ test('landing page', function(done) {
 
     var req = http.request(opt, function(res) {
         res.setEncoding('utf8');
-        var body = '';
+        assert.equal(res.headers.location, 'https://localtunnel.github.io/www/')
-
+        done();
-        res.on('data', function(chunk) {
-            body += chunk;
-        });
-
-        res.on('end', function() {
-            assert(body.indexOf('Redirecting to https://localtunnel.github.io/www/') > 0);
-            done();
-        });
     });
 
     req.end();