Q:

Data transfer to my own computer from a website host by the same computer

I have a question about using a web site host in my computer, say Computer A, using any web server hosting application e.g : apache.  I connect to my website in my very same computer A, and request to download a file of size 1Mb, in otherwords, I am connecting to my own computer and want to download a file in my computer.  In addition, my internet access is bound by a proxy server in a way of gateway.   The questions are - does the file transfer really exist? Or is it a local file copying between 2 location? Will my data packet go through the proxy, to the internet, and go back to the proxy and return to me? 
Thanks everyone who are watching this question.

A:

It won't go off your computer at all if you're using an internal address.
However, if you use an external address (for instance an IP address or dynamic DNS), then it will go out to the DNS server, resolve the address, and at the very worst, connect to the external interface of your proxy.

