-t Test mode. In this mode no throughput measurements are done.
However the full response from the webserver (including headers) is displayed.
This is useful for verifying that you get the right content before executing
the real test. In this mode the number of clients defaults to 1.
-h header value Specifies a HTTP request header. You can use this option several
times to specify several headers. E.g. to specify the User-Agent header you can do: