Handling HTTP Proxy like Fiddler

[achapkowski]

When debugging client issues, I like to use fiddler, this create a temporary proxy that captures web traffic.

Using the standard library, I can detect the proxy:

import urllib.request

def handle_fiddler():
    
    proxies = urllib.request.getproxies()
    if proxies == {}:
        proxies = None
    else:
        proxies['https'] = proxies['https'].replace("https", "http")
        
    return proxies

This returns a dictionary like this:

{'http': 'http://127.0.0.1:8888', 'https': 'http://127.0.0.1:8888'}

Please note that the port will vary based on your machines setup/configuration.

Knowing this information I want to pass this into the Client.get call:

with httpx.Client(proxy=proxies['https'], verify=False) as client:
        url = "https://mysite.com/servers?f=json"
        print(client.get(url).json())

This leads to the following error:

httpx.ConnectError: [SSL: UNEXPECTED_EOF_WHILE_READING] EOF occurred in violation of protocol (_ssl.c:1006)

The same logic works on requests using sessions. What is the magic to make it work here?