.auth doesn't work together with .attach #80 fix

[beshanoe]

Fix for #80
The previous try didn't fix it fully #86
When use Request.auth(username, password, sendImmediately) notation, it was creating incorrect auth object, it was using 'password' instead of 'path'

[nijikokun]

Mind adding a test for the case? This way we know that it's working as intended going forward 👍

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