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ContrapunctusI

•Created by ContrapunctusI on 2/24/2025 in #workers-help

urllib.request.urlopen will throw an exception with Python worker

If we use the following Python code which creates a connection with a website and returns its content:

from js import Response
import urllib.request

def on_fetch(request, env):
    request = urllib.request.Request("https://example.org")
    r = urllib.request.urlopen(request).read()
    html = r.decode('utf-8')

    return Response.new(html)

from js import Response
import urllib.request

def on_fetch(request, env):
    request = urllib.request.Request("https://example.org")
    r = urllib.request.urlopen(request).read()
    html = r.decode('utf-8')

    return Response.new(html)

Any attempt to request the worker will throw this weird error:

X [ERROR] Error in makeHandler

X [ERROR] PythonError: Traceback (most recent call last):
    [...]
    File "/lib/python312.zip/socket.py", line 837, in create_connection
      sock.connect(sa)
  BlockingIOError: [Errno 26] Operation in progress

During handling of the above exception, another exception occurred:
    [...]
    File "/lib/python312.zip/urllib/request.py", line 1392, in https_open
      return self.do_open(http.client.HTTPSConnection, req,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/lib/python312.zip/urllib/request.py", line 1347, in do_open
      raise URLError(err)
  urllib.error.URLError: <urlopen error [Errno 26] Operation in progress>
   [...]

 [wrangler:inf] GET / 500 Internal Server Error (6444ms)

X [ERROR] Error in makeHandler

X [ERROR] PythonError: Traceback (most recent call last):
    [...]
    File "/lib/python312.zip/socket.py", line 837, in create_connection
      sock.connect(sa)
  BlockingIOError: [Errno 26] Operation in progress

During handling of the above exception, another exception occurred:
    [...]
    File "/lib/python312.zip/urllib/request.py", line 1392, in https_open
      return self.do_open(http.client.HTTPSConnection, req,
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/lib/python312.zip/urllib/request.py", line 1347, in do_open
      raise URLError(err)
  urllib.error.URLError: <urlopen error [Errno 26] Operation in progress>
   [...]

 [wrangler:inf] GET / 500 Internal Server Error (6444ms)

etc. (it's quite long) What is going on?

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