If you're installing Magento yourself instead of using our free installation service, you may come across the following error...
The URL {URL} is not accessible.
Error parsing body - doesn\’t seem to be a chunked message
This happens because we run both Apache and NginX on our servers to give you maximum performance. Apache handles the PHP code while NginX is used to serve static content such as images and javascript faster than Apache can.
To install Magento enable "Skip Base URL Validation Before the Next Step" in the installation and your install should proceed without the error.