original_string: public function back()
      {
          do {
              $request = $this->history->back();
          } while (\array_key_exists(serialize($request), $this->redirects));
  
          return $this->requestFromRequest($request, false);
      }
code: public function back()
      {
          do {
              $request = $this->history->back();
          } while (\array_key_exists(serialize($request), $this->redirects));
  
          return $this->requestFromRequest($request, false);
      }
code_tokens: public function back ( ) { do { $ request = $ this -> history -> back ( ) ; } while ( \ array_key_exists ( serialize ( $ request ) , $ this -> redirects ) ) ; return $ this -> requestFromRequest ( $ request , false ) ; }
docstring: Goes back in the browser history.
  
  @return Crawler
docstring_tokens: Goes back in the browser history .