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cURL

You probably already figured this out (or knew), but curl is a command line tool for making HTTP requests. Take a good look at the raw HTTP requests that we just sent to our tcplistener program.

GET /goodies HTTP/1.1       # start-line CRLF
Host: localhost:42069       # *( field-line CRLF )
User-Agent: curl/7.81.0     # *( field-line CRLF )
Accept: */*                 # *( field-line CRLF )
                            # CRLF
                            # [ message-body ] (empty)

POST /coffee HTTP/1.1            # start-line CRLF
Host: localhost:42069            # *( field-line CRLF )
User-Agent: curl/8.6.0           # *( field-line CRLF )
Accept: */*                      # *( field-line CRLF )
Content-Type: application/json   # *( field-line CRLF )
Content-Length: 22               # *( field-line CRLF )
                                 # CRLF
{"flavor":"dark mode"}          # [ message-body ]

I've annotated the parts for you. Remember, there are really just four parts to an HTTP message:

start-line CRLF
\*( field-line CRLF )
CRLF
[ message-body ]

Answer the question(s).