Example request that is dying:
NEW REQUEST! lightning_websocketd:main [1955685] <-- bad request from safari
read 507
write_all 1
-> websocket_to_lightningd
-> read_payload_header
read 2
read_all 1
read -11 <--- This tried to read a part of the header, is this -EAGAIN?
read_all 0 should we be blocking on these reads?
*dies*
Fixes#5089
Changelog-Fixed: `experimental-websocket` intermittent read errors fixed
Signed-off-by: William Casarin <jb55@jb55.com>
WebSocket is a bit weird:
1. It starts like an HTTP connection, but they send special headers.
2. We reply with special headers, one of which involves SHA1 of one of theirs.
3. We are then in WebSocket mode, where each frame starts with a 2-20 byte
header.
We relay data in a simplistic way: if either side sends something, we
read it and relay it synchronously. That avoids any gratuitous
buffering.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
