Agreed. Any time you type a comment longer than a paragraph or two, you get that message.

This seems like a fundamental shortcoming of the continuation-based request approach. POST URLs should never expire.

I created a poll http://news.ycombinator.com/item?id=196196 with some of this issues, I'd like to see how many people care about each one and maybe we can convince PG to start fixing some of them (or release updated source code and accept patches)

I haven't looked that closely at arc, but if it's a continuation based web server (for some reason I thought it was) it has to store those continuations on the server, which means it has to get rid of them after a certain timeout period. Considering I get that expired message quite a bit, I suppose the timeout isn't long enough.

On the plus side, because I have to go back, about half the time I go back I see someone has said something similar to what I was going to say but clearer and more succinctly, which means I don't have to bother posting whatever I was writing.