I'm using node.js to post a http request. the code works with if i define my post data ahead of the 'options' field, but if I initially set my post_data string to empty and update it later it doesn't pick up the new length. How would I get it to do that ? I'm looking to send multiple posts of varying lengths to the same place in a loop so need to be able to do this.
var post_data=''; //if i set my string content here rather than later on it works
var options = {
host: '127.0.0.1',
port: 8529,
path: '/_api/cursor',
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Content-Length': post_data.length
}
};
var req = http.request(options, function(res) {
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
});
req.on('error', function(e) {
console.log('problem with request: ' + e.message);
});
post_data = 'a variable length string goes here';//the change in length to post_data is not //recognised
req.write(post_data);
req.end();
'Content-Length': post_data.length
You ran this before setting post_data.
If you want to set post_data after creating the object, you'll need to set it manually later:
options.headers['Content-Length'] = post_data.length;
Note that you must set that before calling http.request().
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 also requires to declare Content-Type and Content-Length values so the server knows how to interpret the data.
var querystring = require('querystring');
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': data.length
}
};
var req = http.request(options, function(res) {
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log("body: " + chunk);
});
});
req.write(data);
req.end();
You need to replace:
'Content-Length': post_data.length
for:
'Content-Length': Buffer.byteLength(post_data, 'utf-8')