@startuml
[*] --> Read : Connection accepted, hs_read

Read : Read the socket into the buffer
Read : until EWOULDBLOCK
Read --> ParseHttp : _hs_parse

WaitRead --> Read : hs_connection_io_cb
WaitRead : Wait for epoll/kqueue read ready

ParseHttp : Parse the new buffered input
ParseHttp --> RequestCallback : Request ready
ParseHttp --> ChunkCallback : Chunk ready
ParseHttp --> WaitRead : Chunk/Request not ready

RequestCallback : Execute server wide request handler
RequestCallback --> Write : http_respond(_chunk)
RequestCallback --> Read : http_request_read_chunk

ChunkCallback : Execute request chunk handler
ChunkCallback --> Read : http_request_read_chunk
ChunkCallback --> Write : http_respond(_chunk)

Write : Write out the buffer to the socket
Write : until done or EWOULDBLOCK
Write --> [*] : Connection: Close
Write --> WaitWrite : EWOULDBLOCK
Write --> Read : Connection Keep-Alive
Write --> ChunkCallback : Transfer-Encoding: chunked

WaitWrite : Wait for epoll/kqueue write ready
WaitWrite --> Write : hs_connection_io_cb

@enduml