why curl cannot display http header by using option -i

Question

I use curl tool to get something within http protocol, and intent to use option -i to display http-header. There's output message without http-header, only http-body from server in the terminal.

Answer 1

Following this question, you can try ---verbose option instead of -i

As the comment by cfeduke in the question mentioned, it depends on the response of the server as well.