Browsers reject cookies marked with the Secure attribute over HTTP. If your service handles authentication tokens via cookies, HTTPS is mandatory.
HTTPS (Hypertext Transfer Protocol Secure) encrypts data between the browser and the server. Traditionally, HTTPS was only for production websites. However, browsers like Chrome, Firefox, and Edge now aggressively mark HTTP pages as "Not Secure"—even on localhost . Many modern frameworks (Next.js, Angular, Create React App) now enable HTTPS by default to mirror production environments accurately.
(ignore certificate errors):
const https = require('https'); const fs = require('fs'); const express = require('express');
// vite.config.js import defineConfig from 'vite' https localhost 11501 url
)
Then check the PID in Task Manager.
If you see https://localhost:11501/url in a log, an email, a script, or a browser tab, and you don’t know why:
Port numbers above 1024 are unprivileged, meaning any application can bind to them. While port 11501 is not a universally standardized port like 80 (HTTP) or 443 (HTTPS), it frequently appears in specific development ecosystems: Browsers reject cookies marked with the Secure attribute
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If you are developing a frontend app that communicates with a backend on port 11501, configure your vite.config.js : javascript
Many dev servers now enable HTTPS by default or via a flag:
A random-looking port, but not random to you. You chose it — or some framework did. 11501 is the backstage pass. No one stumbles upon it. It’s not 3000 (React), not 8080 (Tomcat), not 5432 (Postgres). It’s yours . Traditionally, HTTPS was only for production websites
If your project on port 11501 is built with .NET, the framework includes a built-in tool to generate and trust local development certificates automatically.
🏠 Enter Localhost: Your Computer's Alias 0.1. Typing 'localhost' in your browser is like saying, “Hello, me!” and connecting dire...
Have you encountered a different odd port or localhost combination? Share your experience in the comments below.
https://localhost:11501/url is a .