Improve error handling in some cases

In Cyclone's fetchBare(), the content type wasn't correct, and the
status line should be "Internal Server Error", not just "Error". In
the main request handler, I added similar error handling, just in case.

app.js

@@ -19,12 +19,19 @@ const serve = new nodeStatic.Server(join(
 const server = http.createServer();
 
 server.on('request', (request, response) => {
-  if (custombare.route(request, response)) return true;
-  
-  if (bareServer.shouldRoute(request)) {
-    bareServer.routeRequest(request, response);
-  } else {
-    serve.serve(request, response);
+  try {
+    if (custombare.route(request, response)) return true;
+
+    if (bareServer.shouldRoute(request)) {
+      bareServer.routeRequest(request, response);
+    } else {
+      serve.serve(request, response);
+    }
+  } catch (e) {
+    response.writeHead(500, "Internal Server Error", {
+      "Content-Type": "text/plain"
+    })
+    response.end(e.stack)
   }
 });
 server.on('upgrade', (req, socket, head) => {

static/customBare.mjs

@@ -82,8 +82,8 @@ async function fetchBare(url, res, req) {
             request.body.pipe(res)
         }
     } catch (e) {
-        res.writeHead(500, 'Error', {
-            'content-type': 'application/javascript'
+        res.writeHead(500, 'Internal Server Error', {
+            'Content-Type': 'text/plain'
         })
         res.end(e.stack);
     }