http response?

[CazualxGrenade]

When i tried to log in to opticraft, it said this message:

Failed to login: java.io.IOException: Server returned HTTP response code:
http://session.minecraft.net/game.joinserverjsp?user=CazualxGrenade&session1d=-(then random numbers)

Does anyone know of this? Or is my account (like some other people said) being hacked maybe?

EDIT: I tried to go on other servers, and it had the same message.

[☣2crzy4uall☣]

yep its happening like last night, give em a bit itll be back up, Its minecraft not us

[CazualxGrenade]

Ah, okay.