Local CORS Proxy - Bypass CORS Restrictions

from flask import Flask, request, Response
import requests
import json

app = Flask(__name__)

@app.route('/<path:url>', methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'])
def proxy(url):
    """
    Simple proxy server to bypass CORS restrictions.
    Usage: http://localhost:5000/https://api.example.com/endpoint
    """
    # Construct the target URL
    if not url.startswith(('http://', 'https://')):
        url = 'https://' + url
    
    # Forward the request method
    method = request.method
    
    # Forward the request headers
    headers = {key: value for key, value in request.headers.items() 
               if key.lower() not in ['host', 'content-length']}
    
    # Forward the request body
    data = request.get_data()
    
    try:
        # Make the request to the target URL
        response = requests.request(
            method=method,
            url=url,
            headers=headers,
            data=data,
            params=request.args,
            stream=True,
            verify=True  # Set to False to ignore SSL certificate errors
        )
        
        # Create a Flask response object
        flask_response = Response(
            response.iter_content(chunk_size=1024),
            status=response.status_code
        )
        
        # Forward the response headers
        for key, value in response.headers.items():
            if key.lower() not in ['content-encoding', 'content-length', 'transfer-encoding']:
                flask_response.headers[key] = value
        
        # Add CORS headers
        flask_response.headers['Access-Control-Allow-Origin'] = '*'
        flask_response.headers['Access-Control-Allow-Methods'] = 'GET, POST, PUT, DELETE, PATCH, OPTIONS'
        flask_response.headers['Access-Control-Allow-Headers'] = '*'
        
        return flask_response
    
    except Exception as e:
        return json.dumps({"error": str(e)}), 500, {'Content-Type': 'application/json'}

@app.route('/', methods=['GET'])
def home():
    return """
    <h1>Local CORS Proxy</h1>
    <p>Usage: http://localhost:5000/https://api.example.com/endpoint</p>
    <p>This proxy will forward your request to the target URL and return the response with CORS headers.</p>
    """

if __name__ == '__main__':
    app.run(debug=True)