old_contents: import os
  import io
  import codecs
  import re
  from setuptools import setup
  
  
  def read(*names):
      with io.open(
          os.path.join(os.path.dirname(__file__), *names),
          encoding='utf-8'
      ) as f:
          return f.read()
  
  
  def find_version(*file_paths):
      version_file = read(*file_paths)
      version_match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]",
                                version_file, re.M)
      if version_match:
          return version_match.group(1)
      raise RuntimeError('Unable to find version string.')
  
  
  with codecs.open('README.md', 'r', 'utf-8') as f:
      readme = f.read()
  with codecs.open('HISTORY.md', 'r', 'utf-8') as f:
      history = f.read()
  
  
  version = find_version('requests_aws4auth', '__init__.py')
  
  
  setup(
      name='requests-aws4auth',
      version=version,
      description='AWS4 authentication for Requests',
      long_description=readme + '\n\n' + history,
      long_description_content_type='text/markdown',
      author='Ted Timmons',
      author_email='ted@tedder.dev',
      url='https://github.com/tedder/requests-aws4auth',
      download_url=('https://github.com/tedder/requests-aws4auth/tarball/' + version),
      license='MIT License',
      keywords='requests authentication amazon web services aws s3 REST',
      install_requires=['requests', 'six'],
      packages=['requests_aws4auth'],
      package_data={'requests_aws4auth': ['test/requests_aws4auth_test.py']},
      classifiers=[
          'Development Status :: 5 - Production/Stable',
          'Intended Audience :: Developers',
          'Natural Language :: English',
          'License :: OSI Approved :: MIT License',
          'Programming Language :: Python',
          'Programming Language :: Python :: 3',
          'Programming Language :: Python :: 3.3',
          'Programming Language :: Python :: 3.4',
          'Programming Language :: Python :: 3.5',
          'Programming Language :: Python :: 3.6',
          'Programming Language :: Python :: 3.7',
          'Programming Language :: Python :: 3.8',
          'Programming Language :: Python :: 3.9',
          'Topic :: Internet :: WWW/HTTP'])
  
  
new_contents: import os
  import io
  import codecs
  import re
  from setuptools import setup
  
  
  def read(*names):
      with io.open(
          os.path.join(os.path.dirname(__file__), *names),
          encoding='utf-8'
      ) as f:
          return f.read()
  
  
  def find_version(*file_paths):
      version_file = read(*file_paths)
      version_match = re.search(r"^__version__ = ['\"]([^'\"]*)['\"]",
                                version_file, re.M)
      if version_match:
          return version_match.group(1)
      raise RuntimeError('Unable to find version string.')
  
  
  with codecs.open('README.md', 'r', 'utf-8') as f:
      readme = f.read()
  with codecs.open('HISTORY.md', 'r', 'utf-8') as f:
      history = f.read()
  
  
  version = find_version('requests_aws4auth', '__init__.py')
  
  
  setup(
      name='requests-aws4auth',
      version=version,
      description='AWS4 authentication for Requests',
      long_description=readme + '\n\n' + history,
      long_description_content_type='text/markdown',
      author='Ted Timmons',
      author_email='ted@tedder.dev',
      url='https://github.com/tedder/requests-aws4auth',
      download_url=('https://github.com/tedder/requests-aws4auth/tarball/' + version),
      license='MIT License',
      keywords='requests authentication amazon web services aws s3 REST',
      install_requires=['requests', 'six'],
      extras_require={
          'httpx': ['httpx',]
      },
      packages=['requests_aws4auth'],
      package_data={'requests_aws4auth': ['test/requests_aws4auth_test.py']},
      classifiers=[
          'Development Status :: 5 - Production/Stable',
          'Intended Audience :: Developers',
          'Natural Language :: English',
          'License :: OSI Approved :: MIT License',
          'Programming Language :: Python',
          'Programming Language :: Python :: 3',
          'Programming Language :: Python :: 3.3',
          'Programming Language :: Python :: 3.4',
          'Programming Language :: Python :: 3.5',
          'Programming Language :: Python :: 3.6',
          'Programming Language :: Python :: 3.7',
          'Programming Language :: Python :: 3.8',
          'Programming Language :: Python :: 3.9',
          'Topic :: Internet :: WWW/HTTP'])
  
  
subject: Add httpx as an extra dependecy