blocks|key|712271|text|根据我将在下面发布的网站，这一切都是你如何设置你的服务器。他们展示的一个例子是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|712272|var+http+=+require("http");
var+url+=+require("url");

function+start(route,+handle)+{
++function+onRequest(request,+response)+{
++++var+pathname+=+url.parse(request.url).pathname;
++++console.log("Request+for+"+%2B+pathname+%2B+"+received.");

++++route(handle,+pathname,+response);
++}

++http.createServer(onRequest).listen(8888);
++console.log("Server+has+started.");
}

exports.start+=+start;|code-block|syntax|javascript|712273|以及它们的路由函数：|712274|function+route(handle,+pathname,+response)+{
++console.log("About+to+route+a+request+for+"+%2B+pathname);
++if+(typeof+handle[pathname]+===+'function')+{
++++handle[pathname](response);
++}+else+{
++++console.log("No+request+handler+found+for+"+%2B+pathname);
++++response.writeHead(404,+{"Content-Type":+"text/plain"});
++++response.write("404+Not+found");
++++response.end();
++}
}

exports.route+=+route;|712275|这是一种方法。http://www.nodebeginner.org/|offset|length|712276|从另一个站点，他们创建一个页面，然后加载它。这可能是你想要的更多东西。|712277|fs.readFile('www/404.html',+function(error2,+data)+{
++++++++++++response.writeHead(404,+{'content-type':+'text/html'});
++++++++++++response.end(data);
++++++++});|712278|http://blog.poweredbyalt.net/?p=81|712279|entityMap|0|LINK|mutability|MUTABLE|url|http://www.nodebeginner.org/|1^0|0|0|0|0|7|S|0|0|0|0|0|Y|1|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|15|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|17|8|@]|9|@$M|18|N|19|1|1A]]|A|$]]|$1|O|3|P|5|6|7|1B|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1C|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1D|8|@]|9|@$M|1E|N|1F|1|1G]]|A|$]]|$1|U|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|T]]]]

According to the site I'll post below, it's all how you set up your server. One example they show is this:

<pre><code>var http = require("http");
var url = require("url");

function start(route, handle) {
 function onRequest(request, response) {
 var pathname = url.parse(request.url).pathname;
 console.log("Request for " + pathname + " received.");

 route(handle, pathname, response);
 }

 http.createServer(onRequest).listen(8888);
 console.log("Server has started.");
}

exports.start = start;
</code></pre>

and their route function:

<pre><code>function route(handle, pathname, response) {
 console.log("About to route a request for " + pathname);
 if (typeof handle[pathname] === 'function') {
 handle[pathname](response);
 } else {
 console.log("No request handler found for " + pathname);
 response.writeHead(404, {"Content-Type": "text/plain"});
 response.write("404 Not found");
 response.end();
 }
}

exports.route = route;
</code></pre>

This is one way.
<a href="http://www.nodebeginner.org/" rel="noreferrer">http://www.nodebeginner.org/</a>

From another site, they create a page and then load it. This might be more of what you're looking for.

<pre><code>fs.readFile('www/404.html', function(error2, data) {
 response.writeHead(404, {'content-type': 'text/html'});
 response.end(data);
 });
</code></pre>

<a href="http://blog.poweredbyalt.net/?p=81" rel="noreferrer">http://blog.poweredbyalt.net/?p=81</a>

blocks|key|496868|text|在Express+site中，定义一个NotFound异常，并在需要404页面时抛出它，或者在以下情况下重定向到/404：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|496869|function+NotFound(msg){
++this.name+=+'NotFound';
++Error.call(this,+msg);
++Error.captureStackTrace(this,+arguments.callee);
}

NotFound.prototype.__proto__+=+Error.prototype;

app.get('/404',+function(req,+res){
++throw+new+NotFound;
});

app.get('/500',+function(req,+res){
++throw+new+Error('keyboard+cat!');
});|code-block|syntax|javascript|496870|entityMap|0|LINK|mutability|MUTABLE|url|http://expressjs.com/en/guide/error-handling.html^0|1|C|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

From the <a href="http://expressjs.com/en/guide/error-handling.html" rel="nofollow noreferrer">Express site</a>, define a NotFound exception and throw it whenever you want to have a 404 page OR redirect to /404 in the below case:

<pre><code>function NotFound(msg){
 this.name = 'NotFound';
 Error.call(this, msg);
 Error.captureStackTrace(this, arguments.callee);
}

NotFound.prototype.__proto__ = Error.prototype;

app.get('/404', function(req, res){
 throw new NotFound;
});

app.get('/500', function(req, res){
 throw new Error('keyboard cat!');
});
</code></pre>

blocks|key|712382|text|从Express4.0开始，就有了专门的sendStatus+function|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|712383|res.sendStatus(404);|code-block|syntax|javascript|712384|712385|如果您使用的是早期版本的Express，请改用status+function。|712386|res.status(404).send('Not+found');|712387|entityMap|0|LINK|mutability|MUTABLE|url|https://expressjs.com/en/api.html#res.sendStatus|1|http://expressjs.com/en/api.html#res.status^0|K|A|K|J|0|0|0|0|N|6|N|F|1|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|N|3|O|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|P|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|Q|$R|$5|S|T|U|E|$V|W]]|X|$5|S|T|U|E|$V|Y]]]]

Since Express 4.0, there's a dedicated <a href="https://expressjs.com/en/api.html#res.sendStatus" rel="noreferrer"><code>sendStatus</code> function</a>:
<pre class="lang-js prettyprint-override"><code>res.sendStatus(404);
</code></pre>
<hr />
If you're using an earlier version of Express, use the <a href="http://expressjs.com/en/api.html#res.status" rel="noreferrer"><code>status</code> function</a> instead.
<pre class="lang-js prettyprint-override"><code>res.status(404).send('Not found');
</code></pre>

blocks|key|712440|text|Express+4.x的更新答案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|712441|与在旧版本的Express中使用res.send(404)不同，新的方法是：|offset|length|style|CODE|712442|res.sendStatus(404);|code-block|syntax|javascript|712443|Express将发送一个带有“找不到”文本的非常基本的404响应：|712444|HTTP/1.1+404+Not+Found
X-Powered-By:+Express
Vary:+Origin
Content-Type:+text/plain;+charset=utf-8
Content-Length:+9
ETag:+W/"9-nR6tc%2BZ4%2Bi9RpwqTOwvwFw"
Date:+Fri,+23+Oct+2015+20:08:19+GMT
Connection:+keep-alive

Not+Found|712445|entityMap^0|0|G|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<h2>Updated Answer for Express 4.x</h2>

Rather than using <code>res.send(404)</code> as in old versions of Express, the new method is:

<pre><code>res.sendStatus(404);
</code></pre>

Express will send a very basic 404 response with "Not Found" text:

<pre><code>HTTP/1.1 404 Not Found
X-Powered-By: Express
Vary: Origin
Content-Type: text/plain; charset=utf-8
Content-Length: 9
ETag: W/"9-nR6tc+Z4+i9RpwqTOwvwFw"
Date: Fri, 23 Oct 2015 20:08:19 GMT
Connection: keep-alive

Not Found
</code></pre>

blocks|key|497002|text|IMO最好的方法是使用next()函数：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|497003|router.get('/',+function(req,+res,+next)+{
++++var+err+=+new+Error('Not+found');
++++err.status+=+404;
++++return+next(err);
}|code-block|syntax|javascript|497004|然后，错误由您的错误处理程序处理，您可以使用HTML很好地设置错误样式。|497005|entityMap^0|B|6|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

IMO the nicest way is to use the <code>next()</code> function:

<pre><code>router.get('/', function(req, res, next) {
 var err = new Error('Not found');
 err.status = 404;
 return next(err);
}
</code></pre>

Then the error is handled by your error handler and you can style the error nicely using HTML.

I want to simulate a 404 error on my Express/Node server. How can I do that?

How to programmatically send a 404 response with Express/Node?

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