Outgoing webhooks from qastaging.launchpad.net not successfully contacting target endpoint

[Hemanth V. Alluri]

What I'm trying to achieve:
    I'm trying to generate test fixtures from the (outgoing) Launchpad API/Webhook for git based repositories.

What steps I've taken and what happened:
    I've configured a webhook target for my project: https://code.qastaging.launchpad.net/~hdrive1999/zulip-x-launchpad and pointed it to a webhook.site endpoint (a tool commonly used for this sort of thing). However when trying out the "push" event I was confronted with the following error message: `git:push:0.1 Connection error: [Errno 2] No such file or directory`.
    Then I changed the target to a pasteb.in endpoint which is another commonly used tool for testing webhooks. However I received the same error.

Additional comments:
    At this resource: https://help.launchpad.net/API/Webhooks, the following was mentioned: "You should ensure that your firewall allows HTTP/HTTPS access (as appropriate) from all the IP addresses associated with webhooks-proxy.launchpad.net. If you are testing from the qastaging sandbox, you should also allow webhooks-proxy.qastaging.paddev.net." Now as far as I'm aware, I do not think that either one of the online tools that I've used would actively block internet traffic from either source. Thus I do not think that this would be an issue, but feel free to let me know if I'm wrong (with supporting details though).

Ultimately what I want here:
    Why am I not able to receive updates from the webhook? Is this due to a known bug in launchpad? Is this even a bug in the first place (as opposed to me doing something wrong)? Is this an issue due to the webhook still being in a beta phase? How can I fix this situation - i.e. actually receive the output of the webhook so that I can save the results as test fixtures?