मैं एक http सर्वर की स्थापना के माध्यम से काम कर रहा हूं। नोड और इंजन का उपयोग कर। हालाँकि, मैं उन मुद्दों पर भाग रहा हूं जिनके बारे में मुझे कम जानकारी है कि कैसे हल करें मैं इस कृपया को हल करने में कुछ मदद करूंगा।
Error: No default engine was specified and no extension was provided.
at new View (...\node_modules\express\lib\view.js:41:42)
at Function.app.render (...\node_modules\express\lib\application.js:484:12)
at ServerResponse.res.render (...\node_modules\express\lib\response.js:783:7)
at Layer.handle (...\app.js:123:7)
at trim_prefix (...\node_modules\express\lib\router\index.js:225:17)
at c (...\node_modules\express\lib\router\index.js:198:9)
at Function.proto.process_params (...\node_modules\express\lib\router\index.js:253:12)
at next (...\node_modules\express\lib\router\index.js:189:19)
at next (...\node_modules\express\lib\router\index.js:202:7)
at next (...\node_modules\express\lib\router\index.js:166:38)नीचे मैंने इस इंजन को शुरू करने के लिए स्थापित किया है।
var http = require('http');
var module = require("module")
var logger = require('morgan');
var express = require('express');
var app = module.exports = express();
var silent = 'test' == process.env.NODE_ENV;
var httpServer = http.createServer(app); // app middleware
app.enable('strict routing');
// app.all('*', function(req, res, next)/*** CORS support.*/
// {
// if (!req.get('Origin')) return next();// use "*" here to accept any origin
// res.set('Access-Control-Allow-Origin', 'http://localhost:3000');
// res.set('Access-Control-Allow-Methods', 'GET, POST');
// res.set('Access-Control-Allow-Headers', 'X-Requested-With, Content-Type');
// res.set('Access-Control-Allow-Max-Age', 3600);
// if ('OPTIONS' == req.method) return res.send(200);
// next();
// });
app.set('views', __dirname + '/views'); // general config
app.set('view engine', 'html');
app.get('/404', function(req, res, next){
next();// trigger a 404 since no other middleware will match /404 after this one, and we're not responding here
});
app.get('/403', function(req, res, next){// trigger a 403 error
var err = new Error('not allowed!');
err.status = 403;
next(err);
});
app.get('/500', function(req, res, next){// trigger a generic (500) error
next(new Error('keyboard cat!'));
});
app.use(express.static(__dirname + '/public'));
//error handlers
app.use(logErrors);
app.use(clientErrorHandler);
app.use(errorHandler);
// middleware with an arity of 4 are considered error handling middleware. When you next(err)
// it will be passed through the defined middleware in order, but ONLY those with an arity of 4, ignoring regular middleware.
function clientErrorHandler(err, req, res, next) {
if (req.xhr) {// whatever you want here, feel free to populate properties on `err` to treat it differently in here.
res.send(err.status || 500, { error: err.message });
}
else
{ next(err);}
};
// create an error with .status. we can then use the property in our custom error handler (Connect repects this prop as well)
function error (status, msg) {
var err = new Error(msg);
err.status = status;
return err;
};
function logErrors (err, req, res, next) {
console.error(err.stack);
next(err);
};
function errorHandler (err, req, res, next) {
res.status(500);
res.render('error', { error: err });
};
// Error handlers
// Since this is the last non-error-handling middleware use()d, we assume 404, as nothing else responded.
// $ curl http://localhost:3000/notfound
// $ curl http://localhost:3000/notfound -H "Accept: application/json"
// $ curl http://localhost:3000/notfound -H "Accept: text/plain"
app.use(function(req, res, next){
res.status(404);
if (req.accepts('html')) {// respond with html page
res.render('404', { url: req.url });
return;
}
if (req.accepts('json')) {// respond with json
res.send({ error: 'Not found' });
return;
}
res.type('txt').send('Not found');// default to plain-text. send()
});
// error-handling middleware, take the same form as regular middleware, however they require an
// arity of 4, aka the signature (err, req, res, next).when connect has an error, it will invoke ONLY error-handling middleware.
// If we were to next() here any remaining non-error-handling middleware would then be executed, or if we next(err) to
// continue passing the error, only error-handling middleware would remain being executed, however here
// we simply respond with an error page.
app.use(function(err, req, res, next){
// we may use properties of the error object here and next(err) appropriately, or if we possibly recovered from the error, simply next().
res.status(err.status || 500);
res.render('500', { error: err });
});
if (!module.parent) {// assigning to exports will not modify module, must use module.exports
app.listen(3000);
silent || console.log('Express started on port 3000');
};