fuel/fuel/core/classes/request/driver.php
public function set_header($header, $content = null)
	{
		if (is_null($content))
		{
			$this->headers[] = $header;
		}
		else
		{
			$this->headers[$header] = $content;
		}

		return $this;
	}
public function set_header($header, $content = null)
	{
		if (is_null($content))
		{
			$this->headers[] = $header;
		}
		else
		{
			$this->headers[$header] = $content;
		}

		return $this;
	}
public function set_header ( $ header , $ content = null ) { if ( is_null ( $ content ) ) { $ this -> headers [ ] = $ header ; } else { $ this -> headers [ $ header ] = $ content ; } return $ this ; }
set a request http header

@param   string  $header
@param   string  $header
@return  Request_Driver
set a request http header