Chrome makes two requests to NodeJS server

Question

When I make a POST request in Chrome to my NodeJS Fastify server, Chrome's network tab displays one post request:

However, Fastify logs two requests each with a unique request ID:

Now, what is crazy is that when I perform the same request in Firefox, Fastify only logs one request... So is this a Chrome issue or a Fastify/NodeJS one?

Front-end POST request:

            const response = await fetch('/api/signupForm', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json'
                },
                body: JSON.stringify({
                    foo: bar,
                })
            }).then(response => response.json()).catch(error => {
                ...
            });

Fastify request:

    fastify.post('/signupForm', {
        body: {
            type: 'object',
            required: ['foo'],
            properties: {
                foo: {
                    type: 'string'
                }
            }
        },
        //Output Serialization
        schema: {
            response: {
                200: {
                    type: 'object',
                    properties: {
                        success: {
                            type: 'boolean'
                        }
                    }
                }
            }
        },
    }, async (req, reply) => {
        console.log('route started..............................................................');

...