TypeError when using venv-exec with the example http-in flow

[Zebble]

Running node-red 4.0.5 in docker.

Using the example http-in (/url) results in an error in the venv node when triggered:

TypeError: Converting circular structure to JSON
--> starting at object with constructor 'Socket'
| property 'parser' -> object with constructor 'HTTPParser'
--- property 'socket' closes the circle

I've confirmed the pip command nodes work nicely and the virtual environment is created properly. Most everything else I've tested works well.

[404background]

Thank you @Zebble for your report to the issue!
I executed flows.json in the examples folder with version 0.5.0 and got an same error.

Since the sample was executable in older versions, I think the error occurred when the execution method was changed.
After deleting msg.req and msg.res, I was able to run the page, but the page did not display in the browser.

If I assign msg.req and msg.res to flow.req and flow.res once and assign them after Python processing, the page is displayed in the browser.

I will try to investigate the cause of the error.

Here is the flow.

[{"id":"aeab9cd3bf5d7fef","type":"debug","z":"d6fad9e77ecc8414","name":"debug 287","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":790,"y":2320,"wires":[]},{"id":"f1cb3fe41dd94f20","type":"inject","z":"d6fad9e77ecc8414","name":"","props":[],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":460,"y":2320,"wires":[["dd049a94d893c70b"]]},{"id":"fa75ba3ec9616df6","type":"http in","z":"d6fad9e77ecc8414","name":"","url":"/url","method":"get","upload":false,"swaggerDoc":"","x":330,"y":2380,"wires":[["8a515ceda5abc0d0","4a6bcb9706fd5b72"]]},{"id":"26d66f28fd4429a4","type":"http response","z":"d6fad9e77ecc8414","name":"","statusCode":"","headers":{"content-type":"text/html"},"x":970,"y":2360,"wires":[]},{"id":"dd049a94d893c70b","type":"venv","z":"d6fad9e77ecc8414","venvconfig":"4657b6fbdbaf6f7e","name":"","code":"import requests\nurl = 'https://example.com/'\n    \ntry:\n    response = requests.get(url)\n\n    if response.status_code == 200:\n        print(response.text)\n    else:\n        print(f\"Failed to retrieve data. Status code: {response.status_code}\")\nexcept requests.RequestException as e:\n    print(f\"An error occurred: {e}\")","continuous":false,"x":630,"y":2320,"wires":[["aeab9cd3bf5d7fef","26c1b0b8033f215a"]]},{"id":"8a515ceda5abc0d0","type":"change","z":"d6fad9e77ecc8414","name":"","rules":[{"t":"move","p":"req","pt":"msg","to":"req","tot":"flow"},{"t":"move","p":"res","pt":"msg","to":"res","tot":"flow"}],"action":"","property":"","from":"","to":"","reg":false,"x":520,"y":2380,"wires":[["dd049a94d893c70b","50b973e3eed3f2ef"]]},{"id":"50b973e3eed3f2ef","type":"debug","z":"d6fad9e77ecc8414","name":"debug 289","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":750,"y":2400,"wires":[]},{"id":"c5c0e59e602d0008","type":"debug","z":"d6fad9e77ecc8414","name":"debug 290","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":650,"y":2440,"wires":[]},{"id":"26c1b0b8033f215a","type":"change","z":"d6fad9e77ecc8414","name":"","rules":[{"t":"set","p":"req","pt":"msg","to":"req","tot":"flow"},{"t":"set","p":"res","pt":"msg","to":"res","tot":"flow"}],"action":"","property":"","from":"","to":"","reg":false,"x":800,"y":2360,"wires":[["26d66f28fd4429a4"]]},{"id":"4a6bcb9706fd5b72","type":"json","z":"d6fad9e77ecc8414","name":"","property":"payload","action":"str","pretty":false,"x":490,"y":2440,"wires":[["c5c0e59e602d0008"]]},{"id":"4657b6fbdbaf6f7e","type":"venv-config","venvname":"pyenv","version":"default"}]

[Zebble]

Thanks @404background !

Glad you were able to replicate the issue. I was able to work around the problem for now using something very similar to what you did but I just saved the entire msg to a flow variable, then re-defined msg before sending it to the python node. I then grabbed the msg flow variable before sending it to the http-out node. All seems to work OK for now.

I did do some further troubleshooting, and looks like the circular reference is a socket which I'm unsure how to fix. I was going to take a look at how other nodes did it before you responded...