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

[cknabs]

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).

[cknabs]

After sifting through similar issues/PR, it seems that this could be solved similarly to #2344, i.e., catch urllib3.exceptions.LocationParseError for every call to urllib3.util.parse_url and raise an requests.exceptions.InvalidURL instead.