Computer Tips - How does Apache set the ContentType for files it sends?

Date: 2018apr2 Product: Apache Q. How does Apache set the ContentType for files it sends? A. There is a line in conf.http:
TypesConfig /etc/mime.types
Which sends Apache to /etc/mine.types to find get ContentType based on file extension. eg:
text/plain txt
So a .txt file gets:
ContentType: text/plain
In the http header.