You are ArchitecturalBuilder, a System Two patch synthesizer in Active Focus mode. Output ONLY exact SEARCH/REPLACE blocks (<<<<<<< SEARCH ... ======= ... >>>>>>> REPLACE), one per hunk, no line numbers, no prose, no markdown fences.
BUDGET: fit the ENTIRE response in 700 tokens; if several hunks are needed, output the most critical first.

ISSUE:
Getting http://.example.com raises UnicodeError
Attempting to get e.g. `http://.example.com` results in a `UnicodeError`. It seems like the intention so far has been to raise `InvalidUrl` instead (see e.g. [this line](https://github.com/psf/requests/blob/ca6f9af5dba09591007b15a7368bc0f006b7cc50/requests/models.py#L401)).

I see there was some hesitation in fixing a similar issue (#4168) and would like to add that even catching the error just to rethrow as a requests exception would be beneficial.

## Expected Result

Based on PR #774: `InvalidUrl: URL has an invalid label.`

## Actual Result

`UnicodeError: encoding with 'idna' codec failed (UnicodeError: label empty or too long)`

## Reproduction Steps

```python3
import requests
requests.get("http://.example.com")
```

## System Information

    $ python -m requests.help

```
{
  "chardet": {
    "version": "3.0.4"
  },
  "cryptography": {
    "version": "2.8"
  },
  "idna": {
    "version": "2.8"
  },
  "implementation": {
    "name": "CPython",
    "version": "3.8.0"
  },
  "platform": {
    "release": "5.3.0-40-generic",
    "system": "Linux"
  },
  "pyOpenSSL": {
    "openssl_version": "1010104f",
    "version": "19.1.0"
  },
  "requests": {
    "version": "2.23.0"
  },
  "system_ssl": {
    "version": "1010103f"
  },
  "urllib3": {
    "version": "1.25.8"
  },
  "using_pyopenssl": true
}
```

CODE CONTEXT:
requests/__init__.py:
# -*- coding: utf-8 -*-

#   __
#  /__)  _  _     _   _ _/   _
# / (   (- (/ (/ (- _)  /  _)
#          /

"""
Requests HTTP Library
~~~~~~~~~~~~~~~~~~~~~

Requests is an HTTP library, written in Python, for human beings.
Basic GET usage:

   >>> import requests
   >>> r = requests.get('https://www.python.org')
   >>> r.status_code
   200
   >>> b'Python is a programming language' in r.content
   True

... or POST:

   >>> payload = dict(key1='value1', key2='value2')
   >>> r = requests.post('https://httpbin.org/post', data=payload)
   >>> print(r.text)
   {
     ...
     "form": {
       "key1": "value1",
       "key2": "value2"
     },
     ...
   }

The other HTTP methods are supported - see `requests.api`. Full documentation
is at <https://requests.readthedocs.io>.

:copyright: (c) 2017 by Kenneth Reitz.
:license: Apache 2.0, see LICENSE for more details.
"""

import urllib3
import warnings
from .exceptions import RequestsDependencyWarning

try:
    from charset_normalizer import __version__ as charset_normalizer_version
except ImportError:
    charset_normalizer_version = None

try:
    from chardet import __version__ as chardet_version
except ImportError:
    chardet_version = None

def check_compatibility(urllib3_version, chardet_version, charset_normalizer_version):
    urllib3_version = urllib3_version.split('.')
    assert urllib3_version != ['dev']  # Verify urllib3 isn't installed from git.

    # Sometimes, urllib3 only reports its version as 16.1.
    if len(urllib3_version) == 2:
        urllib3_version.append('0')

    # Check urllib3 for compatibility.
    major, minor, patch = urllib3_version  # noqa: F811
    major, minor, patch = int(major), int(minor), int(patch)
    # urllib3 >= 1.21.1, <= 1.26
    assert major == 1
    assert minor >= 21
    assert minor <= 26

    # Check charset_normalizer for compatibility.
    if chardet_version:
        major, minor, patch = chardet_version.split('.')[:3]
        major, minor, patch = int(major), int(minor), int(patch)
        # chardet_version >= 3.0.2, < 5.0.0
        assert (3, 0, 2) <= (major, minor, patch) < (5, 0, 0)
    elif charset_normalizer_version:
        major, minor, patch = charset_normalizer_version.split('.')[:3]
        major, minor, patch = int(major), int(minor), int(patch)
        # charset_normalizer >= 2.0.0 < 3.0.0
        assert (2, 0, 0) <= (major, minor, patch) < (3, 0, 0)
    else:
        raise Exception("You need either charset_normalizer or chardet installed")

def _check_cryptography(cryptography_version):
    # cryptography < 1.3.4
    try:
        cryptography_version = list(map(int, cryptography_version.split('.')))
    except ValueError:
        return

    if cryptography_version < [1, 3, 4]:
        warning = 'Old version of cryptography ({}) may cause slowdown.'.format(cryptography_version)
        warnings.warn(warning, RequestsDependencyWarning)

# Check imported dependencies for compatibility.
try:
    check_compatibility(urllib3.__version__, chardet_version, charset_normalizer_version)
except (AssertionError, ValueError):
    warnings.warn("urllib3 ({}) or chardet ({})/charset_normalizer ({}) doesn't match a supported "
                  "version!".format(urllib3.__version__, chardet_version, charset_normalizer_version),
                  RequestsDependencyWarning)

# Attempt to enable urllib3's fallback for SNI support
# if the standard library doesn't support SNI or the
# 'ssl' library isn't available.
try:
    try:
        import ssl
    except ImportError:
        ssl = None

    if not getattr(ssl, "HAS_SNI", False):
        from urllib3.contrib import pyopenssl
        pyopenssl.inject_into_urllib3()

        # Check cryptography version
        from cryptography import __version__ as cryptography_version
        _check_cryptography(cryptography_version)
except ImportError:
    pass

# urllib3's DependencyWarnings should be silenced.
from urllib3.exceptions import DependencyWarning
warnings.simplefilter('ignore', DependencyWarning)

from .__version__ import __title__, __description__, __url__, __version__
from .__version__ import __build__, __author__, __author_email__, __license__
from .__version__ import __copyright__, __cake__

from . import utils
from . import packages
from .models import Request, Response, PreparedRequest
from .api import request, get, head, post, patch, put, delete, options
from .sessions import session, Session
from .status_codes import codes
from .exceptions import (
    RequestException, Timeout, URLRequired,
    TooManyRedirects, HTTPError, ConnectionError,
    FileModeWarning, ConnectTimeout, ReadTimeout, JSONDecodeError
)

# Set default logging handler to avoid "No handler found" warnings.
import logging
from logging import NullHandler

logging.getLogger(__name__).addHandler(NullHandler())

# FileModeWarnings go off per the default.
warnings.simplefilter('default', FileModeWarning, append=True)


requests/compat.py:
# -*- coding: utf-8 -*-

"""
requests.compat
~~~~~~~~~~~~~~~

This module handles import compatibility issues between Python 2 and
Python 3.
"""

try:
    import chardet
except ImportError:
    import charset_normalizer as chardet

import sys

# -------
# Pythons
# -------

# Syntax sugar.
_ver = sys.version_info

#: Python 2.x?
is_py2 = (_ver[0] == 2)

#: Python 3.x?
is_py3 = (_ver[0] == 3)

has_simplejson = False
try:
    import simplejson as json
    has_simplejson = True
except ImportError:
    import json

# ---------
# Specifics
# ---------

if is_py2:
    from urllib import (
        quote, unquote, quote_plus, unquote_plus, urlencode, getproxies,
        proxy_bypass, proxy_bypass_environment, getproxies_environment)
    from urlparse import urlparse, urlunparse, urljoin, urlsplit, urldefrag
    from urllib2 import parse_http_list
    import cookielib
    from Cookie import Morsel
    from StringIO import StringIO
    # Keep OrderedDict for backwards compatibility.
    from collections import Callable, Mapping, MutableMapping, OrderedDict

    builtin_str = str
    bytes = str
    str = unicode
    basestring = basestring
    numeric_types = (int, long, float)
    integer_types = (int, long)
    JSONDecodeError = ValueError

elif is_py3:
    from urllib.parse import urlparse, urlunparse, urljoin, urlsplit, urlencode, quote, unquote, quote_plus, unquote_plus, urldefrag
    from urllib.request import parse_http_list, getproxies, proxy_bypass, proxy_bypass_environment, getproxies_environment
    from http import cookiejar as cookielib
    from http.cookies import Morsel
    from io import StringIO
    # Keep OrderedDict for backwards compatibility.
    from collections import OrderedDict
    from collections.abc import Callable, Mapping, MutableMapping
    if has_simplejson:
        from simplejson import JSONDecodeError
    else:
        from json import JSONDecodeError

    builtin_str = str
    str = str
    bytes = bytes
    basestring = (str, bytes)
    numeric_types = (int, float)
    integer_types = (int,)


requests/help.py:
"""Module containing bug report helper(s)."""
from __future__ import print_function

import json
import platform
import sys
import ssl

import idna
import urllib3

from . import __version__ as requests_version

try:
    import charset_normalizer
except ImportError:
    charset_normalizer = None

try:
    import chardet
except ImportError:
    chardet = None

try:
    from urllib3.contrib import pyopenssl
except ImportError:
    pyopenssl = None
    OpenSSL = None
    cryptography = None
else:
    import OpenSSL
    import cryptography


def _implementation():
    """Return a dict with the Python implementation and version.

    Provide both the name and the version of the Python implementation
    currently running. For example, on CPython 2.7.5 it will return
    {'name': 'CPython', 'version': '2.7.5'}.

    This function works best on CPython and PyPy: in particular, it probably
    doesn't work for Jython or IronPython. Future investigation should be done
    to work out the correct shape of the code for those platforms.
    """
    implementation = platform.python_implementation()

    if implementation == 'CPython':
        implementation_version = platform.python_version()
    elif implementation == 'PyPy':
        implementation_version = '%s.%s.%s' % (sys.pypy_version_info.major,
                                               sys.pypy_version_info.minor,
                                               sys.pypy_version_info.micro)
        if sys.pypy_version_info.releaselevel != 'final':
            implementation_version = ''.join([
                implementation_version, sys.pypy_version_info.releaselevel
            ])
    elif implementation == 'Jython':
        implementation_version = platform.python_version()  # Complete Guess
    elif implementation == 'IronPython':
        implementation_version = platform.python_version()  # Complete Guess
    else:
        implementation_version = 'Unknown'

    return {'name': implementation, 'version': implementation_version}


def info():
    """Generate information for a bug report."""
    try:
        platform_info = {
            'system': platform.system(),
            'release': platform.release(),
        }
    except IOError:
        platform_info = {
            'system': 'Unknown',
            'release': 'Unknown',
        }

    implementation_info = _implementation()
    urllib3_info = {'version': urllib3.__version__}
    charset_normalizer_info = {'version': None}
    chardet_info = {'version': None}
    if charset_normalizer:
        charset_normalizer_info = {'version': charset_normalizer.__version__}
    if chardet:
        chardet_info = {'version': chardet.__version__}

    pyopenssl_info = {
        'version': None,
        'openssl_version': '',
    }
    if OpenSSL:
        pyopenssl_info = {
            'version': OpenSSL.__version__,
            'openssl_version': '%x' % OpenSSL.SSL.OPENSSL_VERSION_NUMBER,
        }
    cryptography_info = {
        'version': getattr(cryptography, '__version__', ''),
    }
    idna_info = {
        'version': getattr(idna, '__version__', ''),
    }

    system_ssl = ssl.OPENSSL_VERSION_NUMBER
    system_ssl_info = {
        'version': '%x' % system_ssl if system_ssl is not None else ''
    }

    return {
        'platform': platform_info,
        'implementation': implementation_info,
        'system_ssl': system_ssl_info,
        'using_pyopenssl': pyopenssl is not None,
        'using_charset_normalizer': chardet is None,
        'pyOpenSSL': pyopenssl_info,
        'urllib3': urllib3_info,
        'chardet': chardet_info,
        'charset_normalizer': charset_normalizer_info,
        'cryptography': cryptography_info,
        'idna': idna_info,
        'requests': {
            'version': requests_version,
        },
    }


def main():
    """Pretty-print the bug information as JSON."""
    print(json.dumps(info(), sort_keys=True, indent=2))


if __name__ == '__main__':
    main()


requests/models.py:
# -*- coding: utf-8 -*-

"""
requests.models
~~~~~~~~~~~~~~~

This module contains the primary objects that power Requests.
"""

import datetime
import sys

# Import encoding now, to avoid implicit import later.
# Implicit import within threads may cause LookupError when standard library is in a ZIP,
# such as in Embedded Python. See https://github.com/psf/requests/issues/3578.
import encodings.idna

from urllib3.fields import RequestField
from urllib3.filepost import encode_multipart_formdata
from urllib3.util import parse_url
from urllib3.exceptions import (
    DecodeError, ReadTimeoutError, ProtocolError, LocationParseError)

from io import UnsupportedOperation
from .hooks import default_hooks
from .structures import CaseInsensitiveDict

from .auth import HTTPBasicAuth
from .cookies import cookiejar_from_dict, get_cookie_header, _copy_cookie_jar
from .exceptions import (
    HTTPError, MissingSchema, InvalidURL, ChunkedEncodingError,
    ContentDecod

ROUND: 1