Can I use python's third-party library pythonnet to call Fiddlercore?

[tgqz]

When I try to do that, it doesn't work

[Pavel]

Could you please provide a sample code that we can review and obtain a better perspective on what the issue might be.

Here is a sample application that you can use as a starter point for integrating Fiddler Core - Fiddler Core Demos. It is in .NET but it might be useful for you to better understand the concepts. Fiddler Core exposes a collection of events that your application can hook on. Keep in mind that if you do not provide a handler with the correct signature the integration won't work. This is an example of a possible reason why your solution might not work.

[Cassie]

Hello,

I'd be glad to provide a sample code combining insights from the previous responses and addressing potential issues:

Understanding the Challenge:

FiddlerCore in Python: While FiddlerCore is a .NET library, you can interact with it from Python using the pythonnet library. However, there are limitations and potential compatibility challenges.
Code Example: A well-structured Python code example demonstrating FiddlerCore integration would be ideal.
Addressing Limitations and Considerations:

FiddlerCore Version: Ensure compatibility between pythonnet and the FiddlerCore version you're using. Refer to pythonnet documentation for supported versions.
Error Handling: Implement proper error handling using try-except blocks to catch potential exceptions during FiddlerCore interaction.
Resource Management: Use using statements (if applicable) or explicit Dispose() calls to ensure resources are released correctly.
Sample Code (Illustrative Purposes):  marykayintouch

import clr
import sys

# Assuming FiddlerCore4.dll is in the same directory or a valid path
clr.AddReference("FiddlerCore4")
from Fiddler import FiddlerApplication

def on_before_request(session):
    # Modify or inspect request details here (optional)
    print(f"Request URL: {session.url}")

def main():
    try:
        # Startup Fiddler (adjust port if needed)
        FiddlerApplication.Startup(8877)

        # Hook before request event handler
        FiddlerApplication.BeforeRequest += on_before_request

        # Simulate traffic for testing (replace with your actual application logic)
        print("Simulating traffic...")
        # ... your application code here ...

        # Wait for user input to stop
        print("Press Enter to stop...")
        input()

    except Exception as e:
        print(f"Error: {e}")
    finally:
        # Shutdown Fiddler (if necessary)
        FiddlerApplication.Shutdown()

if __name__ == "__main__":
    main()

Import Libraries: Import clr for .NET interop and sys (optional).
Add Reference: Add reference to FiddlerCore4.dll (adjust filename and path if needed).
Import Fiddler Classes: Import necessary classes from Fiddler namespace.
on_before_request Function: This function (optional) demonstrates how to capture requests before they are sent.
main Function:
try block: Attempts Fiddler startup, event handler registration, and application logic.
FiddlerApplication.Startup(8877): Starts Fiddler on port 8877 (change if needed).
FiddlerApplication.BeforeRequest += on_before_request: Registers the event handler.
Simulate traffic...: Replace with your application code that generates traffic.
input(): Waits for user input to stop the application.
except block: Catches any exceptions during Fiddler interaction.
finally block: Shuts down Fiddler (optional).
Main Execution: Executes the main function if the script is run directly.

I hope the solution may help you.