React HTTPS服务器无法访问，指定端口后正常运行求助

Hey there! Let's break down why you're seeing this weird behavior and get it fixed. From what you've shared, the core problem ties to how your development server handles HTTPS and port assignments. Here's a step-by-step breakdown of possible causes and solutions:

1. Mismatched HTTPS Port Configuration #

HTTPS uses port 443 by default, while HTTP relies on port 80. The fact that https://www.noosmall.com:80 works tells me your dev server is running HTTPS on port 80 instead of the standard 443. When you visit https://www.noosmall.com without a port, your browser automatically tries to connect to port 443—but your server isn't listening there, hence the failed page load.

Fix: #

• Check your create-react-app dev server config (usually in webpack.config.js or via environment variables) for the port setting. If it's set to 80 while https: true is enabled, that's the root cause.
• For development, I recommend switching to a non-privileged port (like 3001) for HTTPS, since ports 1-1024 require root access. Update your config to:

  devServer: {
    https: true,
    port: 3001,
    // ... your existing cert/key file configurations
  }
  

• If you need to use port 443 (to avoid typing the port every time), start your dev server with root privileges:

  sudo npm start
  

  Just be cautious using sudo for development servers—only do this if you fully trust your project dependencies.

2. Verify HTTPS Setup is Fully Loaded #

Double-check that your dev server is actually using the cert/key files you've configured. Look at the startup logs when you run npm start—you should see a line like:

Starting the development server on https://www.noosmall.com:443/

If the log says it's listening on port 80 instead, that confirms your port config is overriding the default HTTPS port.

3. Firewall or Network Blocking #

If your server is correctly listening on port 443, make sure your firewall (local or server-side) isn't blocking incoming traffic on 443. Many systems block privileged ports by default unless explicitly allowed.

Quick Test: #

• Run telnet www.noosmall.com 443 from your machine. If it fails to connect, the port is likely blocked. Adjust your firewall rules to open port 443 for HTTPS traffic.

4. Clear Browser Cache or Use Incognito Mode #

Sometimes browsers cache old connection metadata, which can cause it to still try connecting to an old port or HTTP instead of HTTPS. Clear your browser cache, or open a private/incognito window and try https://www.noosmall.com again.

5. DNS and Hosts File Check #

Ensure www.noosmall.com is resolving to the correct IP address of your dev server. If you're testing locally, double-check your /etc/hosts (Linux/macOS) or C:\Windows\System32\drivers\etc\hosts (Windows) file to make sure the domain points to your local machine's IP.

Give these steps a go—most likely adjusting the port configuration to use 443 (with root) or a non-privileged port will resolve the issue. Let me know if you hit any roadblocks!

内容的提问来源于stack exchange，提问作者user3201528