New Relic: Script always returns Status 400 but works in Postman - node.js

Question

I'm trying to make a healthcheck for my service in New Relic. So I just want to call one of my APIs every x minutes and see if it returns 200.
In New Relic I created a new synthetic monitor and now I'm trying to write a script for that monitor.
The script is supposed to make a post request to our service and receive a token in the response with status 200. In Postman this post request works and returns the token + Status 200 (I replaced the sensitive strings with <...>):
curl --location --request POST <TOKEN_URL> \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode 'grant_type=client_credentials' \
--data-urlencode 'client_id=<CLIENT_ID_DEV>' \
--data-urlencode 'client_secret=<CLIENT_SECRET_DEV>'
But when I try to recreate that with the script, it always returns Status 400 Bad Request.
This is my script:
var assert = require('assert');
//Defining my authentication credentials.
var IDK_TOKEN_URL = $secure.TOKEN_URL;
var CLIENT_ID = $secure.CLIENT_ID_DEV;
var CLIENT_SECRET = $secure.CLIENT_SECRET_DEV;
var options = {
url: IDK_TOKEN_URL,
body: JSON.stringify({
grant_type: 'client_credentials',
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
}),
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
};
//Define expected results using callback function.
function callback(error, response, body) {
console.log(response.statusCode + " status code")
assert.ok(response.statusCode == 200, 'Expected 200 OK response');
var info = JSON.parse(body);
assert.ok(info.success == true, 'Expected True results in Response Body, result was ' + info.success);
console.log("End reached");
}
//Make POST request, passing in options and callback.
$http.post(options, callback);
This is what I see in the console:
It seems to automatically append a port 443 to my url, so instead of <my url>.io/oidc/v1/token, the request seems to get fired to <my url>.io:443/oidc/v1/token?
And when I click on "View resource" in the image above, I see:
But I'm using a post method, why is it saying anything about get method is not allowed?
This is the HAR log that I can download in the new relic console:
"request": {
"cookies": [],
"headers": [
{
"name": "Content-Type",
"value": "application/x-www-form-urlencoded"
},
{
"name": "host",
"value": "<my url>.io"
},
{
"name": "content-length",
"value": "187"
},
{
"name": "X-Abuse-Info",
"value": "Request sent by a New Relic Synthetics Monitor (https://docs.newrelic.com/docs/synthetics/new-relic-synthetics/administration/identify-synthetics-requests-your-app) - monitor id: df1817f0-fac2-49f4-a0d5-479d254dfa1a | account id: 2807718"
},
{
"name": "X-NewRelic-Synthetics",
"value": "[1,2807718,\"fddc843c-8fe0-497f-bf5b-52c2805a265e\",\"b6da79b9-37ab-4a8a-a792-f3fa0f99f205\",\"df1817f0-fac2-49f4-a0d5-479d254dfa1a\"]"
}
],
"headersSize": 607,
"bodySize": 187,
"method": "POST",
"url": "<my url>.io:443/oidc/v1/token/",
"httpVersion": "HTTP/1.1",
"queryString": [],
"postData": {
"mimeType": "application/x-www-form-urlencoded",
"text": "{\"grant_type\":\"client_credentials\",\"client_id\":\"_SECURECREDENTIAL_\",\"client_secret\":\"_SECURECREDENTIAL_\"}",
"params": []
},
"_ajax": false,
"_mixedContentType": "unknown",
"_referrerPolicy": "",
"_isLinkPreload": false,
"_host": "<my url>.io",
"_port": 443,
"_path": "/oidc/v1/token/"
},
"response": {
"cookies": [],
"headers": [
{
"name": "Date",
"value": "Thu, 06 May 2021 10:21:05 GMT"
},
{
"name": "Content-Type",
"value": "application/json"
},
{
"name": "Content-Length",
"value": "67"
},
{
"name": "Connection",
"value": "close"
},
{
"name": "Cache-Control",
"value": "no-cache, no-store, max-age=0, must-revalidate"
},
{
"name": "Expires",
"value": "0"
},
{
"name": "Pragma",
"value": "no-cache"
},
{
"name": "Referrer-Policy",
"value": "origin"
},
{
"name": "Strict-Transport-Security",
"value": "max-age=31536000 ; includeSubDomains"
},
{
"name": "Vary",
"value": "accept-encoding,origin,access-control-request-headers,access-control-request-method,accept-encoding"
},
{
"name": "X-Content-Type-Options",
"value": "nosniff"
},
{
"name": "X-Frame-Options",
"value": "DENY"
},
{
"name": "X-Vcap-Request-Id",
"value": "e2006a3c-0c27-4194-6b81-d9f037158ca3"
},
{
"name": "X-Xss-Protection",
"value": "1; mode=block"
}
],
"headersSize": 544,
"bodySize": 67,
"status": 400,
"statusText": "Bad Request",
"httpVersion": "HTTP/1.1",
"content": {
"size": 639,
"compression": 572,
"mimeType": "application/json",
"text": ""
},
"redirectURL": "",
"_chromeStatusText": "Bad Request",
"_connectionReused": false,
"_fromServiceWorker": false,
"_fromDiskCache": false,
"_fromAppCache": false,
"_fromCache": false
},

Answer 1

I had to replace 'body' with 'form' like in this example.
I aslo added now the call to the API after the token was received. The final script was:
var assert = require('assert');
//Define your authentication credentials.
var TOKEN_URL = $secure.TOKEN_URL;
var MY_SERVICE_BASE_URL = $secure.MY_SERVICE_BASE_URL_DEV;
var CLIENT_ID = $secure.CLIENT_ID_DEV;
var CLIENT_SECRET = $secure.CLIENT_SECRET_DEV;
function new_relic_callback(err, response, body) {
assert.equal(response.statusCode, 200, 'Expected a 200 OK response');
};
function api_request_callback(err, response, body) {
var parsed_body = JSON.parse(body);
var api_request = {
url: CONSENT_BASE_URL + '/rest of URL...',
headers: {
'Authorization': 'Bearer ' + parsed_body["access_token"]
}
};
$http.get(api_request, new_relic_callback);
};
var token_request = {
url: TOKEN_URL,
form: {
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
grant_type: "client_credentials"
},
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
};
$http.post(token_request, api_request_callback);