salt: Problem with salt-api and salt-ssh

Hi,

I’m trying to use salt-ssh with salt-api and it didn’t work.

When I execute the normal sentence it works:

salt-ssh 'MachineSSH' test.ping

But when I tried to run over salt-api appears an error:

david@david-PC:~$ curl -si localhost:9191/run -H 'Accept: application/x-yaml' -d client='ssh' -d tgt='MachineSSH' -d fun='test.ping'
HTTP/1.1 200 OK
Content-Length: 388
Access-Control-Expose-Headers: GET, POST
Vary: Accept-Encoding
Server: CherryPy/3.2.2
Allow: GET, HEAD, POST
Access-Control-Allow-Credentials: true
Date: Mon, 02 May 2016 07:55:40 GMT
Access-Control-Allow-Origin: *
Content-Type: application/x-yaml

return:
- MachineSSH:
    retcode: 254
    stderr: ''
    stdout: 'The host key needs to be accepted, to auto accept run salt-ssh with the
      -i flag:

      The authenticity of host ''192.168.254.2 (192.168.254.2)'' can''t be established.

      ECDSA key fingerprint is ad:27:39:e6:20:0a:3b:15:a7:82:b4:1c:e6:ba:4d:f0.

      Are you sure you want to continue connecting (yes/no)? '

I don’t know how to pass “-i” flag via curl.

Can anyone help me please?

Thanks!