[MM3-users] Re: Timeout error on anonymous subscribe

On 10/23/24 23:36, vogt@spamcop.net wrote:

I have tried anything I could think of but I cannot reproduce the issue using curl as user mailman (or any other for that matter)

Going directly for localhost:8000, using some or all of the headers I can capture with tcpdump:

$ curl -v -H 'Accept-Encoding: gzip, deflate' -H 'Connection: Keep-Alive' -H 'Host: lists.example.org' -A 'python-requests/2.32.3' http://localhost:8000/mailman3/api/templates/list/community.lists.example.com/list:user:action:subscribe

as well as going through the local httpd:

$ curl -v --http1.1 -H 'Accept-Encoding: gzip, deflate' -H 'Connection: Keep-Alive' -H 'Host: lists.example.org' -A 'python-requests/2.32.3' https://lists.example.org/mailman3/api/templates/list/community.lists.example.com/list:user:action:subscribe

Running tcpdump during those runs shows me it's sending the same headers as mailman does. Thus on http protocol level it's the same, but still the server returns immediately.

What I have just noticed is that the Date header in the delayed response is the "late" time. I have even compared tcp headers from either capture. They look identical down to the frame sizes.

The only difference the last times is that with curl, the server side sends the ACK for the request and milliseconds later a PSH,ACK with the response headers. When it comes internally from mailman it sends the ACK for the request and then 5 seconds later it sends the PSH,ACK with the response headers.

I'm unable to explain what's going on. You could try one more thing in an attempt to duplicate this outside of Mailman. Invoke the same python3 that Mailman does - this may be in a venv or the system python3. If in a venv, you don't need to activate the venv, just run venv/bin/python.

Then in response to Python's prompts do

 >>> import requests
 >>> res = 
requests.get('https://lists.example.org/mailman3/api/templates/list/community.lists.example.com/list:user:action:subscribe', 
timeout=5)

and see what that does? I think it should time out because this is exactly what Mailman core is doing tho get the template, and if it does, perhaps you can determine why from this simple example.

-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan