handle 1xx messages properly

[reschke]

Example: https://redbot.org/?uri=https%3A%2F%2Fnghttp2.org%2F%3F103-eh

Seems redbot is taking the 103 as final responses and waits the socket to be closed as there is no Content-Length information.

[mnot]

Have it working, roughed in like this:

[mnot]

Open questions:

• [x] Get it into HAR, TXT output
• [ ] Make sure Notes are going to the right destination
• [ ] options line (e.g., response header size) after each? Or aggregate?
• [ ] separate notes out for each response?
• [ ] see what body on 1xx looks like.

[reschke]

Looks good.

How would you have a body on 1xx, though?

[mnot]

I want to make sure it calls this out as an error in a good way.

[reschke]

Ack.