Not possible to call out to external websites

[markwilkinson]

Description

In both my own jupyterlite, and in the demo jupyterlite, it is not possible to call out to external websites. It always results in an error related to insecure requests. This happens with all URLs that I have tested, and happens whether or not the request call includes a "validate=true/false" flag.

Reproduce

1. Code block:

import requests

def download_file_into_memory(url):
    response = requests.get(url)
    if response.status_code == 200:
        return response.content
    else:
        print(f"Failed to download file. Status code: {response.status_code}")
        return None


file_content = download_file_into_memory("https://cnn.com")

3. Run

4. See error:

/lib/python3.11/site-packages/urllib3/connectionpool.py:1101: InsecureRequestWarning: Unverified HTTPS request is being made to host 'cnn.com'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#tls-warnings
  warnings.warn(
---------------------------------------------------------------------------
JsException                               Traceback (most recent call last)
File /lib/python3.11/site-packages/urllib3/contrib/emscripten/fetch.py:380, in send_request(request)
    378         js_xhr.setRequestHeader(name, value)
--> 380 js_xhr.send(to_js(request.body))
    382 headers = dict(Parser().parsestr(js_xhr.getAllResponseHeaders()))

JsException: NetworkError: Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'https://cnn.com/'.

During handling of the above exception, another exception occurred: