How to authenticate using appid and appsecret in nodejs using https request - node.js

Question

Here is the sample code for my application. Why It's not working ?
Error:
"{"error":"unauthorized","error_description":"An Authentication object was not found in the SecurityContext"}"
var post_data = JSON.stringify({
'appid' : results.appid,
'appsecret': results.appsecret,
});
var url = serviceUrl+"/oauth-service/oauth/token?grant_type=client_credentials";
var post_options = {
host: url,
headers: {
'Content-Type': 'application/json'
},
data:post_data
};
const req = https.request(post_options, function(res) {
res.setEncoding('utf8');
res.on('data',function(chunk){
console.log(chunk);
});
});
req.write(post_data);
req.end();

Answer 1

From the HTTPS request side, you don't need to have data in post_options (the data is sent using write).
More importantly, you need to set the Content-Length header to Buffer.byteLength(post_data).
Also, the host (or hostname) field should contain just the hostname (e.g. www.facebook.com - no https:// is needed) and the rest of the URL (e.g. /oauth_service/...) should be put in the path field.
Here's an example adapted from the node.js docs. They only provide examples for http but it's mostly the same as for https:
const postData = JSON.stringify({
'msg': 'Hello World!'
});
const options = {
hostname: 'www.google.com',
path: '/upload',
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Content-Length': Buffer.byteLength(postData)
}
};
const req = https.request(options, (res) => {
console.log(`STATUS: ${res.statusCode}`);
console.log(`HEADERS: ${JSON.stringify(res.headers)}`);
res.setEncoding('utf8');
res.on('data', (chunk) => {
console.log(`BODY: ${chunk}`);
});
res.on('end', () => {
console.log('No more data in response.');
});
});
req.write(postData);
req.end();
Note that without specifying which service you're working with, it's impossible to say whether you're implementing the protocol correctly (e.g. whether the URL is correct, whether your request body is correct, etc.). So if you fix the Content-Length and things still don't work, please provide more information.