In the first header, the one containing HTTP/1.0 200 OK, the 200 is the important part.
200 is an HTTP status code that means that the HTTP request succeeded completely normally.
The OK after 200 is just a short description of the status code.
In the second header, Content
-
Type says that this is a plain text web page, instead of an HTML
web page. If it was an HTML web page, the second header would set text/html as the content
type instead of text/plain.
The blank line between Content
-
Type: text/plain and
index.njs
separates the HTTP response
header for the HTTP response body.
Finally, the
index.njs
line is the HTTP response body.