urllib3 LocationParseError (label empty or too long) uncaught by requests

When accessing an URL with a label with more than 63 characters, an urllib3.exceptions.LocationParseError (label empty or too long) is returned without being caught by requests.
Maybe this is related to #4746?

Expected Result

No exception, or an exception raised by requests (maybe InvalidURL?).

Actual Result

Exception is not caught by requests.

Reproduction Steps

import requests
requests.get('http://1234567890123456789012345678901234567890123456789012345678901234.com')
Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/requests/sessions.py", line 542, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/requests/sessions.py", line 655, in send
    r = adapter.send(request, **kwargs)
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/requests/adapters.py", line 439, in send
    resp = conn.urlopen(
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/urllib3/connectionpool.py", line 699, in urlopen
    httplib_response = self._make_request(
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/urllib3/connectionpool.py", line 394, in _make_request
    conn.request(method, url, **httplib_request_kw)
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/urllib3/connection.py", line 234, in request
    super(HTTPConnection, self).request(method, url, body=body, headers=headers)
  File "/usr/lib64/python3.8/http/client.py", line 1255, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib64/python3.8/http/client.py", line 1301, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib64/python3.8/http/client.py", line 1250, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib64/python3.8/http/client.py", line 1010, in _send_output
    self.send(msg)
  File "/usr/lib64/python3.8/http/client.py", line 950, in send
    self.connect()
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/urllib3/connection.py", line 200, in connect
    conn = self._new_conn()
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/urllib3/connection.py", line 169, in _new_conn
    conn = connection.create_connection(
  File "/home/christian/Projects/EUvsDisinfo/venv/lib64/python3.8/site-packages/urllib3/util/connection.py", line 69, in create_connection
    return six.raise_from(
  File "<string>", line 3, in raise_from
urllib3.exceptions.LocationParseError: Failed to parse: '1234567890123456789012345678901234567890123456789012345678901234.com', label empty or too long

System Information

$ python -m requests.help

{
  "chardet": {
    "version": "4.0.0"
  },
  "cryptography": {
    "version": ""
  },
  "idna": {
    "version": "2.10"
  },
  "implementation": {
    "name": "CPython",
    "version": "3.8.7"
  },
  "platform": {
    "release": "5.10.11-100.fc32.x86_64",
    "system": "Linux"
  },
  "pyOpenSSL": {
    "openssl_version": "",
    "version": null
  },
  "requests": {
    "version": "2.25.1"
  },
  "system_ssl": {
    "version": "1010109f"
  },
  "urllib3": {
    "version": "1.26.2"
  },
  "using_pyopenssl": false
}    

This command is only available on Requests v2.16.4 and greater. Otherwise,
please provide some basic information about your system (Python version,
operating system, &c).

The traceback leads to requests/adapters.py, after Session.send and during the urllib3 connection attempt. Reproduce the request with the overlong hostname, then inspect how urllib3.exceptions.LocationParseError is handled there. Done means the malformed URL produces the agreed requests-level behavior rather than leaking the urllib3 exception.