code: public function withoutHeader($name)
      {
          $instance = clone $this;
  
          if ($this->hasHeader($name)) {
              $static = clone $this;
  
              unset($static->headers[$name]);
  
              $instance = $static;
          }
  
          return $instance;
      }
docs: Returns an instance without the specified header.
  
  @param  string $name
  @return static