Fetch Request Troubleshooting

It sounds like you’ve been dealing with a really frustrating issue! The “failed to fetch” error can definitely be annoying, especially when everything looks good on the surface. Here are some things you can check and try to help solve your problem:

1. Check the URL

Even though you’ve already double-checked the URL, just make sure it includes the right protocol (http:// or https://), and make sure there’s no trailing slash if your Flask endpoint doesn’t expect one.

2. CORS Issues

Since you’re working locally, CORS issues are a common culprit. You mentioned you added Flask-CORS. Here’s a quick setup:

from flask_cors import CORS
app = Flask(__name__)
CORS(app)

Make sure this is happening right after you initialize your Flask app. If you want to allow specific origins, you might try something like CORS(app, resources={r"/your-endpoint": {"origins": "http://localhost:3000"}}) just to test.

3. Run Flask on the Correct Port

Check if your Flask app is indeed running on port 5000 and receiving your requests. Sometimes, it might be running on a different port if you accidentally specified it somewhere.

4. Look at the Fetch Request

Make sure your fetch request is appropriately structured. Here’s a simple outline:

fetch('http://localhost:5000/your-endpoint')
    .then(response => {
        if (!response.ok) {
            throw new Error('Network response was not ok');
        }
        return response.json();
    })
    .then(data => console.log(data))
    .catch(error => console.error('There has been a problem with your fetch operation:', error));

5. Check for Network Issues in Browser

Open your browser’s dev tools (usually F12) and look for the ‘Network’ tab. Try making your request again and see if it shows up there. You might get more details on any errors that are occurring.

6. Flask Logs

If there are still issues, check the console output of your Flask application. It may log some useful information about what’s going wrong.

7. Firewall or Antivirus Software

Sometimes firewall or security software can interfere with local server requests, so you might want to check that too.

8. Clear Browser Cache

If you’ve been testing a lot, sometimes your browser cache can get in the way. Try clearing the cache or using an incognito window.

By trying out these steps, you might just stumble upon the solution! It can be super tricky to debug these things, but keep at it. You’ve got this!