Error received - CORS request denied on Firefox browser (Ubuntu)

I encountered a CORS error (CORS request rejected: https://localhost:3000/users) while attempting to register a new user. This issue arose from content in the book Building APIs with node.js, Chapter 12. I am currently using Firefox on Ubuntu and have tried various solutions online to disable CORS within Firefox without success. I am unsure whether I need to adjust any settings in Firefox or add specific code to the example provided. Any guidance would be greatly appreciated.

import NTask from "../ntask.js";
import Template from "../templates/signup.js";

class Signup extends NTask {
  constructor(body) {
    super();
    this.body = body;
  }
  render() {
    this.body.innerHTML = Template.render();
    this.body.querySelector("[data-name]").focus();
    this.addEventListener();
  }
  addEventListener() {
    this.formSubmit();
  }
  formSubmit() {
    const form = this.body.querySelector("form");
    form.addEventListener("submit", (e) => {
      e.preventDefault();
      const name = e.target.querySelector("[data-name]");
      const email = e.target.querySelector("[data-email]");
      const password = e.target.querySelector("[data-password]");
      const opts = {
        method: "POST",
        url: `${this.URL}/users`,
        json: true,
        body: {
          name: name.value,
          email: email.value,
          password: password.value
        }
      };
      this.request(opts, (err, resp, data) => {
        if (err || resp.status === 412) {
          alert("IF: " + err);
          this.emit("error", err);
        } else {
          alert("ELSE")
          this.emit("signup", date);
        }
      });
    });
  }
}

module.exports = Signup;

Answer №1

After some searching, I believe I have come across the solution to my problem. It seems that by skipping over chapters 10 and 11, I missed crucial information about CORS in the API, which is covered in chapter 11 titled "Preparing the Production Environment."

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