square/okhttp — pull request #44 by swankjesse (2012-09-29 16:22:21+00:00)
Title: Support noop frames. Make ping sending a blocking (synchronous) call.

Although blocking calls don't fit the SPDY model very well, they
make exception transparency easy. In this case, a NOOP or a PING
will throw if it cannot be sent. This is good.