Respond to attachment with hane

Black 2 responds with hane.  

White 1 intends to settle up quickly here. When you are weak and the opposition is strong you should play closer to the opponent's stones.

Black responds with hane 2.

One of the possible continuations  

Before playing 1 (or even before the attachment) white should check if the ladder is favourable for him.

HolIgor

Another possible continuation?  

How about this? (my first edit, just trying ;) )

unkx80: I think not so good. White ends up in gote instead.

Standard joseki  

bud1027: This is a standard sequence.

hane to an attachment 1  

Klaus: Here is joseki, even if the hane is on the second line!

hane to an attachment 2  

And again! is just the right move!

hane to an attachment 3  

Most of us will know this one...

Sometimes hane to a supported attachment  

Alex: is playable, making light shape.

Typical contact play 1  

For example here is more common as an answer to than White at a, according to a database search I've just run. The advantage of is that it takes away Black's possible sabaki techniques here: we can assume Black is defending, or will be poor in fighting terms

Typical contact play 2  

Here is more commonly answered with than with White at a, though both are frequent in practice. Black will presumably continue now with at b or c. If is at a then at b is expected. The motivation for playing White at a is often explained as 'not giving Black momentum'. It is actually when White is in a position to attack that one expects to see the heavier response at a from White.

So in both these cases it seems that avoiding the hane answer is connected to a wish to attack with a free hand, by not leaving cutting points.