public function setHeader(string $headerName, $headerValue): HttpRequestContract
	{
		$this->headers[ $headerName ] = $headerValue;
		return $this;
	}
public function setHeader(string $headerName, $headerValue): HttpRequestContract
	{
		$this->headers[ $headerName ] = $headerValue;
		return $this;
	}
public function setHeader ( string $ headerName , $ headerValue ) : HttpRequestContract { $ this -> headers [ $ headerName ] = $ headerValue ; return $ this ; }
Set header in request

@param string $headerName
@param mixed $headerValue

@return HttpRequestContract
Set header in request