Question

I’m working on a programing assignment regarding using GET request.
I am using C.

I wonder if any headers fields and values of GET packet have to be capitalized?

For example:

GET / HTTP/1.1
Connection: Keep-Alive

vs

get / HTTP/1.1
connection: keep-alive

Answer 1

HTTP method names are case-sensitive:

The Method token indicates the method
to be performed on the resource
identified by the Request-URI. The
method is case-sensitive.

HTTP header names are case-insensitive.