GMail API using POST request, error code: 400, recipient address required - node.js

Question

I am trying to send an email using POST request with just Node standard modules in NodeJS v8.10 via GMail API.
The sample code is given below.
I am getting an error:
{
"error": {
"errors": [
{
"domain": "global",
"reason": "invalidArgument",
"message": "Recipient address required"
}
],
"code": 400,
"message": "Recipient address required"
}
}
It says recipient address required but according to what I think, (I may be wrong), my base64url conversion is proper since I checked it in Google API Explorer but my problem is in passing the data, I am doing it properly as told in the guide i.e. inside body with 'raw' key but it still does not work and this is where my problem must be. Maybe I am missing something, maybe I do not know the proper structure.
Yes, there are multiple posts regarding this but none of them provided solution.
I referred the guide on https://developers.google.com/gmail/api/v1/reference/users/messages/send
but the given example is of with the use of client library.
I tried everything, passing the 'raw' with base64url encoded data into write function of the request, passing it as a data parameter in options, passing it through body parameters in options, everything I can think of.
Am I missing something? Where am I going wrong?
I am a newbie in nodejs so please explain and if possible, an example structure of solution would be most welcome.
Base64url produced is working fine, I guess. I copied the string produced by conversion and tried it at https://developers.google.com/gmail/api/v1/reference/users/messages/send?apix=true
It works fine and sends me the mail but it does not work on my code.
var email = (
"Content-Type: text/plain; charset=\"UTF-8\"\n" +
"Content-length: 5000\n" +
"MIME-Version: 1.0\n" +
"Content-Transfer-Encoding: message/rfc2822\n" +
"to: something#something.com\n" +
"from: \"Some Name\" <something#gmail.com>\n" +
"subject: Hello world\n\n" +
"The actual message text goes here"
);
async function sendMail(token,resp) {
return new Promise((resolve,reject) => {
var base64EncodedEmail = Buffer.from(email).toString('base64');
var base64urlEncodedEmail = base64EncodedEmail.replace(/\+/g, '-').replace(/\//g, '_');
var params = {
userId: 'me',
resource: {
'raw': base64urlEncodedEmail
}
};
var body2 = {
"raw": base64urlEncodedEmail,
}
var options = {
hostname: 'www.googleapis.com',
path:'/upload/gmail/v1/users/me/messages/send',
headers: {
'Authorization':'Bearer '+token,
'Content-Type':'message/rfc822',
},
body: {
"raw": base64urlEncodedEmail,
'resource': {
'raw': base64urlEncodedEmail,
}
},
data: JSON.stringify({
'raw': base64urlEncodedEmail,
'resource': {
'raw': base64urlEncodedEmail,
}
}),
message: {
'raw': base64urlEncodedEmail,
},
payload: {
"raw": base64urlEncodedEmail, //this is me trying everything I can think of
},
// body: raw,
// }
userId: 'me',
// resource: {
// 'raw': base64urlEncodedEmail
// },
method: 'POST',
};
var id='';
console.log(base64urlEncodedEmail);
const req = https.request(options, (res) => {
var body = '';
res.on('data', (d) => {
body += d;
});
res.on('end', () => {
var parsed = body;
console.log(parsed);
})
});
req.on('error', (e) => {
console.error(e);
});
req.write(JSON.stringify(body2));
req.end();
});
};
Thank you for your time and answers.

Answer 1

I found the solution.
It says everywhere to convert the rfc822 formatted string to Base64url to send and attach it to 'raw' property in the POST body but I don't know what has changed and you don't need to do that anymore.
First things first, the Content-Type in header should be
'Content-Type':'message/rfc822'
Now, since we are specifying the content-type as message/rfc822, we don't need to convert the data we want to send into base64url format anymore, I guess (Not sure of the reason because I have a very little knowledge about this.)
Only passing "To: something#any.com" as body works.
Here is the complete code of how to get it done for someone who is struggling for the same problem.
function makeBody(to, from, subject, message) {
let str = [
"to: ", to, "\n",
"from: ", from, "\n",
"subject: ", subject, "\n\n",
message,
].join('');
return str;
}
async function getIdAsync(token,resp) {
return new Promise((resolve,reject) => {
let raw = makeBody("something#gmail.com", "something#gmail.com", "Subject Here", "blah blah blah");
var options = {
hostname: 'www.googleapis.com',
path:'/upload/gmail/v1/users/me/messages/send',
headers: {
'Authorization':'Bearer '+token,
'Content-Type':'message/rfc822'
},
method: 'POST',
};
const req = https.request(options, (res) => {
var body = '';
res.on('data', (d) => {
body += d;
});
res.on('end', () => {
var parsed = body;
console.log(parsed);
})
});
req.on('error', (e) => {
console.error(e);
});
req.write(raw);
req.end();
});
};
Happy Coding :)