I ran into a server this morning that was being extra-super-duper explicit and specifyingserver_max_window_bits=15, so I started digging into the RFC and the negotiation code... These are the changes I would like to make:

1. Client allows server to specifyserver_max_window_bits: The server may use a smaller sliding window for compression without affecting the client's decompression.
2. Server allows client to specifyserver_max_window_bits=15: Although the server can't support a smaller sliding window at the moment, it doesn't hurt to accept the specification of 15 bits from a client.
3. Server declines unacceptable compression offers without rejecting the request and selects the first acceptable offer: According to the RFC, the client may send multiple offers in its preferential order and the server may accept its preferred offer or decline all of them. Declining a compression offer doesn't mean the connection must be terminated.
4. Removes deadx-webkit-deflate-frame code.