Serving a file (e.g. in Apache) from a named pipe (made with mkfifo)

Let's say I use Apache, and that I am in /var/www/html/. I do: mkfifo test.tar tar cvf - ~/test/* > test.tar & In a browser, when trying to download http://localhost/test.tar I get: ERR_EMPTY_RESPONSE (didn’t send any data) Is there a specific parameter of mkfifo that would the pipe look really like a regular file? Here the problems seems to come from the fact the file is a named pipe. In my real example, I might use different webservers (not Apache), like [CivetWeb](https://github.com/civetweb/civetweb) , but first I want to analyze if it works with Apache (that I use the most).