Date: 2018apr2 Update: 2026sep4 Product: Apache Q. Apache: 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/mime.types (it could conceivably be another file) to find get ContentType based on file extension. eg:

text/plain txt

So a .txt file gets:

ContentType: text/plain

In the http header.