Basic proxy that adds your CARTO API key to any requests and forwards them to CARTO

proxy.py

import requests
from flask import Flask, request


BASE_URL = "https://my_account.carto.com"  # Or CDN, or on-prem
API_KEY = "my_api_key"
VERIFY_SSL_CERT = True  # Set to False if you don't want the proxy to verify CARTO's cert


app = Flask(__name__)


@app.route('/', defaults={'path': ''})
@app.route('/<path:path>')
def add_api_key(path):
    # Add API key to every forwarded request
    args = dict(request.args)
    args["api_key"] = API_KEY

    # Forward request to CARTO
    response = requests.get(BASE_URL + request.path, params=args, verify=VERIFY_SSL_CERT)

    # We want to forward CARTO's response headers.
    # However, response from CARTO may come in chunks and it's much easier forward the whole thing
    try:
        del(response.headers["Content-Encoding"])
    except KeyError:
        pass
    try:
        del(response.headers["Transfer-Encoding"])
    except KeyError:
        pass

    # Send CARTO's response (as a whole) back to the browser
    return (response.content, response.status_code, response.headers.items())


if __name__ == "__main__":
    # Client code should point to "https://localhost:5000/whatever" (or equivalent) instead of "https://my_account.carto.com/whatever"
    # Using a self-signed cert here
    # In order to use real certs, do app.run(ssl_context=('path.to/server.crt', 'path.to/server.key'))
    app.run(ssl_context="adhoc")

requirements.txt

Flask
requests
pyOpenSSL