How to send carriage return over telnet?

When you are operating in a Telnet client, sending a newline or carriage return control code to the client, will send it directly to the host.

The easiest way to do what you want would be to copy/paste the HTTP GET request from another text editor, so that the newlines are embedded in the text.

You can set the crlf option in telnet. You can do this by, during your telnet session, typing the escape character (^]), and then "toggle crlf". A perhaps cleaner way is to specify this before making the connection:

$ telnet
telnet> toggle crlf
Will send carriage returns as telnet <CR><LF>.
telnet> open mailhost smtp