I just started using node js and I've moved one of my websites on it:
var http = require('http');
var fs = require('fs');
var app = http.createServer(function (req, res) {
fs.readFile('./index.html', 'utf-8', function(error, content) {
res.writeHead(200, {'Content-Type' : 'text/html'});
res.end(content);
});
});
app.listen(8080);
The index.html is my website home page. With only html it works, but if i put tags in it (for including jquery for example), it gives JS errors in firebug : Uncaught syntax error : unexpected token < in jquery.js, and then of course '$ is undefined'.
It doesn't load images either.
I don't really need to do some routing or use Express framework or anything, it's just a simple one-page website.
What am I doing wrong ?
Your server isn't handling requests for images or other resources. All requests are given the same response of the ./index.html page.
This means that if an external script or an image is included in the page, when a request is made by the browser for those resources, the original index.html page will be delivered instead.
NodeJS is fairly low-level. You need to set up your server to manually handle requests for different types of resources based on the URL for each request.
Your best bet will be to read through some NodeJS tutorials. They should cover the basics of serving content, though many of them won't deal with the lower-level details, and will suggest packages like Connect or Express.
Change your code to this, and you'll see all the resources being requested.
var http = require('http');
var fs = require('fs');
var url = require('url');
var path = require('path');
var app = http.createServer(function (req, res) {
var pathname = url.parse(req.url).pathname;
var ext = path.extname(pathname).toLowerCase();
console.log(pathname);
if (ext === ".html") {
fs.readFile('./index.html', 'utf-8', function(error, content) {
res.writeHead(200, {'Content-Type' : 'text/html'});
res.end(content);
});
}
});
app.listen(8080);
Related
I created localhost/server on node js, and my pictures/img tag doesn't work
<div class="text-center">
<img alt = "Bulb" src="pic_bulboff.gif" class="rounded" alt="bulboff">
</div>
but the problem is that they show up when I open them in a regular browser without the server
const http = require('http')
const fs = require('fs')
const port = 3000
const server = http.createServer(function(req, res){
res.writeHead(200, { 'Content-Type': 'text/html'})
fs.readFile('index.html', function(error, data) {
if(error) {
res.writeHead(404)
res.write('Error: File not Found')
} else {
res.write(data)
}
res.end();
})
})
above is the node server.
is there a problem that I can't really see?
Thanks!!!
By default a nodejs http server does not serve ANY files at all. You've created an http server that serves index.html for ALL incoming requests. So, a browser makes a request from your web server and you send it the HTML content from index.html.
Then, the browser parses that HTML and sees an <img> tag with a src attribute of "pic_bulboff.gif" so the browser then sends a request to your web server asking it for the content for /pick_bulboff.gif. But, you web server just responds to that request by sending index.html. That obviously doesn't work. You need your web server to know the difference between different path requests so it will server index.html when the browser is requesting /, but will serve that image when the browser is requesting /pick_bulboff.gif.
While most people will use a simple web framework that has the serving of static files as a built-in feature (like the Express framework), you can do it manually if you want:
const http = require('http');
const fs = require('fs');
const port = 3000;
function sendFile(fname, contentType) {
res.writeHead(200, { 'Content-Type': contentType});
fs.readFile(fname, function(error, data) {
if(error) {
res.writeHead(404);
res.write('Error: File not Found');
} else {
res.write(data);
}
res.end();
}
}
const server = http.createServer(function(req, res){
if (req.url === "/") {
sendFile('index.html', 'text/html');
} else if (req.url === '/pick_bulboff.gif') {
sendFile('pick_bulboff.gif', 'image/gif');
} else {
res.writeHead(404);
res.end('Error: Unsupported path');
}
});
server.listen(port);
In a more typical implementation, you would put all static files in one directory hierarchy that was separate from your code and you would use functionality similar to express.static() in the Express framework to serve any file in that static files directory that matches an incoming request so you don't have to create a custom route for every single static file you're using in your project.
I'm trying to make a simple game using Node.js and HTML. I want to be able to run the game locally (so localhost). But when I start my Node server, only the HTML content is rendered - my images don't show up and the JS is not loaded. I reference JavaScript files, CSS files and images in the HTML code. Not sure why the server cannot reference these from within the HTML.
Here is my server code:
const path = require('path')
const http = require('http')
var fs = require('fs')
//Set port number:
const port = 3000
const requestHandler = (request, response) => {
console.log(request.url)
response.writeHead(200, {"Content-Type": "text/html"});
response.end(fs.readFileSync('game.html'));
}
const server = http.createServer(requestHandler)
server.listen(port, (err) => {
if (err) {
return console.log('Error: ', err);
}
console.log(`Game started\nGo to http://localhost:3000 to play\n`);
console.log(`Server is listening on ${port}...`);
})
Can anyone tell me how I can get my images/JS loaded?
TIA
You are not serving the static content correctly (i.e. images, CSS). Consider what happens when one navigates to http://localhost:3000/some_image.png - they will be served game.html!
You need to account for users requesting that content in your requestHandler by for example reading the file they want with fs.readFileSync(request.url). Remember to check that they can only request files you want them to be able to read!
You need static handlers to return static content. Check this
https://www.pabbly.com/tutorials/node-js-http-module-serving-static-files-html-css-images/.
Also, if your application is going to be huge then use some middle-ware like Express. (https://expressjs.com/)
If you use express framework, you can use static rendering:
app.use(express.static('public'));
where 'public' is the folder name
I have a very simple web server like this:
var http = require('http');
var fs = require('fs');
http.createServer(function (req, res) {
res.writeHead(200, { 'Content-Type': 'text/html' });
fs.readFile('./index.html', 'utf-8', function (err, content) {
if (err) {
res.end('something went wrong.');
return;
}
res.end(content);
});
}).listen(8080);
console.log("Server running on port 8080.")
This renders my index.html without any issues, but if I try to reference another file in my index.html via a script tag for instance, the site just gets stuck, unable to find the file which exists in the server directory.
How can I make those files available to my index.html file?
Please keep in mind that I realize this can be done much more easily with Express but I do not wish to use Express. I am trying to learn how things work behind the scene. Thanks in advance.
You need to make the directory visible to public. Its is recommend to use framework while developing the Node.js application.
Here is the code below to server file without framework.
var basePath = __dirname;
var http = require('http');
var fs = require('fs');
var path = require('path');
http.createServer(function(req, res) {
var stream = fs.createReadStream(path.join(basePath, req.url));
stream.on('error', function() {
res.writeHead(404);
res.end();
});
stream.pipe(res);
}).listen(9999);
Refer : Node itself can serve static files without express or any other module..?
Basic question but not sure where to turn to start figuring this out.
I've setup a very simple node server on port 3000 that just responds with an index.html file. When I call http://localhost:3000 in the browser, I get the proper page served up with dependencies. I don't want to authenticate every time though so I'd like to run it from the user-level.
I tried typing http://localhost~myusername:3000 in the browser but I keep getting:
The requested URL /~myusername:3000 was not found on this server.
(I have setup user-level root to be accessed through ~/Sites and have gotten access to files through here, even php, it's just when I start using a node server this problem occurs.)
How can I get node.js to respond to user-level requests? And it serve up the proper index.html from the relative path of the user-level root instead of /library/WebServer/Documents?
Update
Code of server.js:
var http = require('http');
var fs = require('fs');
function send404(response) {
response.writeHead(404, { 'Content-Type': 'text/plain' });
response.write('Error 404: Resource not found.');
response.end();
}
var server = http.createServer(function (req, res) {
if (req.method == 'GET' && req.url == '/') {
res.writeHead(200, { 'content-type': 'text/html' });
fs.createReadStream('./index.html').pipe(res);
}
else {
send404(res);
}
}).listen(3000);
console.log('server running on port 3000');
I get back a remote url which contains a pdf file at another domain. I need to pass this file to the user somehow through initiating file download Save As dialogue inside the client's browsers.
var request = require("request");
expressjs_app.get("/file_url", function(req, res){
request.get('remote_file_url').pipe(res);
});
if you are using http module and not express js then replace the 2nd part with:
var http = require("http");
http.createServer(function (req, res) {
if (req.url === '/file_url') {
request.get('remote_file_url').pipe(res);
}
});
Update:
With 'request' module deprecated, there are other alternatives that can be used. Below snippet is using nodejs native https module. Replace the request.get line with this:
var https = require('https');
https.get('remote_file_url', remote_response => remote_response.pipe(res));