-d does not imply POST, but its help text claims it does

[korya]

Problem

The -d flag description is copied from curl:

-d, --data string   Sends the specified data in a POST request to the HTTP server

But unlike curl, the method is not switched — it stays GET unless -X is passed.

Reproduction

$ http-assert -d 'hello=1' --assert-ok http://127.0.0.1:8791/echo
[.] HTTP/1.1 GET http://127.0.0.1:8791/echo          ← GET, with a body
…
{"method": "GET", "body": "hello=1", …}

Why it matters

A GET with a request body is legal but almost never what the user meant, and the help text actively promises otherwise.

Suggested fix

Pick one and make the docs match:

1. Match curl — default the method to POST when -d is supplied and -X is not; or
2. Keep the current behaviour and fix the help text to Send the specified data as the request body.

Option 1 matches user expectation; option 2 is the smaller change.