How to connect to a running mitmproxy wsgi-flask-app on Ubuntu

Question

I am working with the example here: https://github.com/mitmproxy/mitmproxy/blob/main/examples/addons/wsgi-flask-app.py

I have tried using the upstream means to connect to it like

mitmproxy --mode upstream:http://127.0.0.1:2108@8000 -s wsgi-flask-app.py

but it didn't work. I also tried setting my hosts file

sudo nano /etc/hosts

I want to know what one will configure to be able to hit the stated route through mitmproxy. Do note that the http://127.0.0.1:2108 is served through

python3 -m http.server 2108

Answer 1

The Mitmproxy WSGI sample script add-on is pretty simple, it provides a virtual host on which you can implement custom routes using Flask.

You can run mitmproxy with this add-on you can simply use mitmproxy/mitmdump/mitmweb using the following arguments:

mitmdump -s wsgi-flask-app.py

This starts mitmproxy in regular proxy mode on port 8080. As a next step you have to use a HTTP client or web browser that is configured to use mitmproxy as http proxy (in this example the mitmproxy proxy URL is http://127.0.0.1:8080). Use the http client to request the url http://example.com on port 80. I use curl command-line tool but any other http client works as well:

curl --proxy "http://127.0.0.1:8080" http://example.com:80/

or without port (http uses implicit port 80):

curl --proxy "http://127.0.0.1:8080" http://example.com/

Executing this command will return Hello World! from the hello_world() function in wsgi-flask-app.py