code: def get(self):
          
          environment_variables_output = [html_for_env_var(key)
                                          for key in sorted(os.environ)]
  
          cgi_arguments_output = []
          if os.getenv('CONTENT_TYPE') == 'application/x-www-form-urlencoded':
              # Note: a blank Content-type header will still sometimes
              # (in dev_appserver) show up as 'application/x-www-form-urlencoded'
              form = cgi.FieldStorage()
              if not form:
                  cgi_arguments_output.append('No CGI arguments given...')
              else:
                  for cgi_argument in form:
                      cgi_arguments_output.append(
                              html_for_cgi_argument(cgi_argument, form))
          else:
              data = ''
              cgi_arguments_output.append(STDIN_TEMPLATE.format(len(data)))
              cgi_arguments_output.append(cgi.escape(data))
  
          modules_api_output = [
              html_for_modules_method('get_current_module_name'),
              html_for_modules_method('get_current_version_name'),
              html_for_modules_method('get_current_instance_id'),
              html_for_modules_method('get_modules'),
              html_for_modules_method('get_versions'),
              html_for_modules_method('get_default_version'),
              html_for_modules_method('get_hostname'),
          ]
  
          result = PAGE_TEMPLATE.format(
              users.CreateLoginURL(self.request.url),
              users.CreateLogoutURL(self.request.url),
              '<br>\n'.join(environment_variables_output),
              '<br>\n'.join(cgi_arguments_output),
              '<br>\n'.join(modules_api_output),
          )
  
          self.response.write(result)
docs: GET handler that serves environment data.