The primary cause of this error is that the server at localhost:8666/routeREST/ is not explicitly allowing requests from the origin localhost:8080. This is a common issue when using CORS policies.Another possible cause could be a misconfiguration of the server's headers or middleware, but in this ca

How do I fix: Using a Proxy Server?

Step 1: Step 1: Set up a proxy server (e.g., using NGINX or Apache) on localhost:8080 that forwards requests from localhost:8666/routeREST/ to the original server.Step 2: Step 2: Configure the proxy server to handle CORS requests by adding the necessary headers and middleware.

Software⏱️ 3 min read📅 2026-06-04

How to Fix: CORS error on same domain?

Q: How do I fix: 🔧 Proven Troubleshooting Steps Enabling CORS on the Server?

Step 1: Step 1: Check the server's configuration files (e.g., server.py) for any CORS-related settings. If you find a setting that disables CORS, update or remove it.Step 2: Step 2: Add the necessary headers to the server's response to explicitly allow cross-origin requests. This typically involves

CORS error occurs when a web page tries to load resources from another domain, but the server doesn't allow it. In your case, the issue is caused by the Python Bottle server not including the necessary CORS headers in its responses.

Quick Answer: Add the `Access-Control-Allow-Origin` header to your Python Bottle server to allow requests from localhost:8080.

📋 Table of Contents

⚠️ Common Causes
🔧 Proven Troubleshooting Steps
✨ Wrapping Up

The CORS (Cross-Origin Resource Sharing) error occurs when a web application running at one origin (domain, protocol, or port) tries to access resources from another origin. In this case, the issue is occurring between two servers running on different ports: localhost:8666/routeREST/ and localhost:8080/

This error can be frustrating because it prevents JavaScript applications from making requests to certain APIs or resources, even if they are hosted on the same domain.

⚠️ Common Causes

The primary cause of this error is that the server at localhost:8666/routeREST/ is not explicitly allowing requests from the origin localhost:8080. This is a common issue when using CORS policies.
Another possible cause could be a misconfiguration of the server's headers or middleware, but in this case, it seems like the server is simply not configured to allow cross-origin requests.

🔧 Proven Troubleshooting Steps

Enabling CORS on the Server

Step 1: Step 1: Check the server's configuration files (e.g., server.py) for any CORS-related settings. If you find a setting that disables CORS, update or remove it.
Step 2: Step 2: Add the necessary headers to the server's response to explicitly allow cross-origin requests. This typically involves adding the 'Access-Control-Allow-Origin' header with the '*' wildcard to allow requests from all origins.
Step 3: Step 3: Restart the server after making any changes to ensure the new configuration takes effect.

Using a Proxy Server

Step 1: Step 1: Set up a proxy server (e.g., using NGINX or Apache) on localhost:8080 that forwards requests from localhost:8666/routeREST/ to the original server.
Step 2: Step 2: Configure the proxy server to handle CORS requests by adding the necessary headers and middleware.

✨ Wrapping Up

To resolve the CORS error, you can either enable CORS on the server or use a proxy server to forward requests. By following these steps, you should be able to make cross-origin requests between your JavaScript application and the Python Bottle server.

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