Sending data through POST request from a node.js server to a node.js server
I'm trying to send data through a POST request from a node.js server to another node.js server. What I do in the "client" node.js is the following:
var options = {
host: 'my.url',
port: 80,
path: '/login',
method: 'POST'
};
var req = http.request(options, function(res){
console.log('status: ' + res.statusCode);
console.log('headers: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function(chunk){
console.log("body: " + chunk);
});
});
req.on('error', function(e) {
console.log('problem with request: ' + e.message);
});
// write data to request body
req.write('datan');
req.write('datan');
req.end();
This chunk is taken more or less from the node.js website so it should be correct. The only thing I don't see is how to include username and password in the options variable to actually login. This is how I deal with the data in the server node.js (I use express):
app.post('/login', function(req, res){
var user = {};
user.username = req.body.username;
user.password = req.body.password;
...
});
How can I add those username and password fields to the options variable to have it logged in?
Thanks
Posting data is a matter of sending a query string (just like the way you would send it with an URL after the ? ) as the request body.
This requires Content-Type and Content-Length headers, so the receiving server knows how to interpret the incoming data. (*)
var querystring = require('querystring');
var http = require('http');
var data = querystring.stringify({
username: yourUsernameValue,
password: yourPasswordValue
});
var options = {
host: 'my.url',
port: 80,
path: '/login',
method: 'POST',
headers: {
'Content-Type': 'application/x-www-form-urlencoded',
'Content-Length': Buffer.byteLength(data)
}
};
var req = http.request(options, function(res) {
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log("body: " + chunk);
});
});
req.write(data);
req.end();
(*) Sending data requires the Content-Type header to be set correctly, ie application/x-www-form-urlencoded for the traditional format that a standard HTML form would use.
It's easy to send JSON ( application/json ) in exactly the same manner; just JSON.stringify() the data beforehand.
URL-encoded data supports one level of structure (ie key and value). JSON is useful when it comes to exchanging data that has a nested structure.
The bottom line is: The server must be able to interpret the content type in question. It could be text/plain or anything else; there is no need to convert data if the receiving server understands it as it is.
Add a charset parameter (eg application/json; charset=Windows-1252 ) if your data is in an unusual character set, ie not UTF-8. This can be necessary if you read it from a file, for example.
You can also use Requestify, a really cool and very simple HTTP client I wrote for nodeJS + it supports caching.
Just do the following for executing a POST request:
var requestify = require('requestify');
requestify.post('http://example.com', {
hello: 'world'
})
.then(function(response) {
// Get the response body (JSON parsed or jQuery object for XMLs)
response.getBody();
});
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