old_contents: # coding: utf-8
  
  import logging
  import base64
  from flask import request, Response
  from oauthlib.common import to_unicode, bytes_type
  
  log = logging.getLogger('flask_oauthlib')
  
  
  def extract_params():
      """Extract request params."""
      uri = request.url
      http_method = request.method
      headers = dict(request.headers)
      if 'wsgi.input' in headers:
          del headers['wsgi.input']
      if 'wsgi.errors' in headers:
          del headers['wsgi.errors']
      if 'Http-Authorization' in headers:
          headers['Authorization'] = headers['Http-Authorization']
  
      body = request.form.to_dict()
      return uri, http_method, body, headers
  
  
  def decode_base64(text):
      """Decode base64 string."""
      # make sure it is bytes
      if not isinstance(text, bytes_type):
          text = text.encode('utf-8')
      return to_unicode(base64.b64decode(text), 'utf-8')
  
  
  def create_response(headers, body, status):
      """Create response class for Flask."""
      response = Response(body or '')
      for k, v in headers.items():
          response.headers[k] = v
  
      response.status_code = status
      return response
  
new_contents: # coding: utf-8
  
  import logging
  import base64
  from flask import request, Response
  from oauthlib.common import to_unicode, bytes_type
  
  log = logging.getLogger('flask_oauthlib')
  
  
  def extract_params():
      """Extract request params."""
      uri = request.url
      http_method = request.method
      headers = dict(request.headers)
      if 'wsgi.input' in headers:
          del headers['wsgi.input']
      if 'wsgi.errors' in headers:
          del headers['wsgi.errors']
  
      body = request.form.to_dict()
      return uri, http_method, body, headers
  
  
  def decode_base64(text):
      """Decode base64 string."""
      # make sure it is bytes
      if not isinstance(text, bytes_type):
          text = text.encode('utf-8')
      return to_unicode(base64.b64decode(text), 'utf-8')
  
  
  def create_response(headers, body, status):
      """Create response class for Flask."""
      response = Response(body or '')
      for k, v in headers.items():
          response.headers[k] = v
  
      response.status_code = status
      return response
  
subject: Delete useless header transform in extract_params.