system/HTTP/URI.php
public function setPort(int $port = null)
	{
		if (is_null($port))
		{
			return $this;
		}

		if ($port <= 0 || $port > 65535)
		{
			throw HTTPException::forInvalidPort($port);
		}

		$this->port = $port;

		return $this;
	}
public function setPort(int $port = null)
	{
		if (is_null($port))
		{
			return $this;
		}

		if ($port <= 0 || $port > 65535)
		{
			throw HTTPException::forInvalidPort($port);
		}

		$this->port = $port;

		return $this;
	}
Sets the port portion of the URI.

@param integer $port

@return $this