src/Guzzle/Http/Message/Response.php
public function setProtocol($protocol, $version)
    {
        $this->protocol = $protocol;
        $this->protocolVersion = $version;

        return $this;
    }
public function setProtocol($protocol, $version)
    {
        $this->protocol = $protocol;
        $this->protocolVersion = $version;

        return $this;
    }
public function setProtocol ( $ protocol , $ version ) { $ this -> protocol = $ protocol ; $ this -> protocolVersion = $ version ; return $ this ; }
Set the protocol and protocol version of the response

@param string $protocol Response protocol
@param string $version  Protocol version

@return self
Set the protocol and protocol version of the response