text: class ReverseProxied(object):
      '''Wrap the application in this middleware and configure the
      front-end server to add these headers, to let you quietly bind
      this to a URL other than / and to an HTTP scheme that is
      different than what is used locally.
  
      In nginx:
      location /myprefix {
          proxy_pass http://192.168.0.1:5001;
          proxy_set_header Host $host;
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header X-Scheme $scheme;
          proxy_set_header X-Script-Name /myprefix;
          }
  
      Source: http://flask.pocoo.org/snippets/35/
  
      :param app: the WSGI application
      '''
      def __init__(self, app):
          self.app = app
  
      def __call__(self, environ, start_response):
          script_name = environ.get('HTTP_X_SCRIPT_NAME', '')
          if script_name:
              environ['SCRIPT_NAME'] = script_name
              path_info = environ['PATH_INFO']
              if path_info.startswith(script_name):
                  environ['PATH_INFO'] = path_info[len(script_name):]
  
          scheme = environ.get('HTTP_X_SCHEME', '')
          if scheme:
              environ['wsgi.url_scheme'] = scheme
          return self.app(environ, start_response)
  