Failing HTTP "Post" Request from GitHub Pages - node.js

Question

I'm currently building my own website that is hosted on GitHub Pages.
The app is built with react.js and what is shown here is a contact form.
The problem I'm encountering is that I cannot send a POST request to a google cloud platform with the cloud function service through the form on the GitHub pages.
Am sure the node.js code on GCP is working since i've used Postman to send a request.
With the GCP log, the function is able to parse the POST:
GCP Success with Postman
GCP Failure from website
// react code
submitForm(event) {
const {name, email, subject, message} = this.state;
console.log("sending email...");
console.log(JSON.stringify({name: name, email: email, subject: subject, msg: message}));
fetch('GCP_API_HTTP', {
method: 'POST',
headers: { 'content-type': 'application/json', },
body: JSON.stringify({ name: name, email: email, subject: subject, msg: message })
}).then((response) => {
if (response.status === 200) {
return response.text();
} else {
this.setState({emailError: true});
return response.text();
}
})
}
Here's what's on GCP:
// GCP
const sgMail = require('#sendgrid/mail');
sgMail.setApiKey('API_KEY');
exports.contactMe = (req, res)=> {
let jsonBody;
switch (req.get('Content-Type')) {
// '{"name":"John"}'
case 'application/json':
jsonBody = req.body;
break;
// 'John'
case 'text/plain':
jsonBody = req.body;
break;
// 'name=John' in the body of a POST request (not the URL)
case 'application/x-www-form-urlencoded':
jsonBody = req.body;
break;
}
let msg = {
to: 'example#gmail.com',
from: { email: jsonBody.email, name: jsonBody.name },
subject: jsonBody.subject,
text: jsonBody.msg
};
sgMail.send(msg);
res.send("received!");
res.end();
};

Answer 1

It is quite critical to understand that GitHub Pages publishes any static files that you push to your repository. And it's also keen to note that...
GitHub Pages does not support server-side languages e.g. nodejs, python etc.
Since POST requests require server-side communication, you'll need to get an actual server host. Here's a good read about Static sites by GitHub Pages