event-httpd: add event httpd support

Add event httpd, which is a small and basic http server designed to
provide server sent events to clients. The server accepts updates
through a simple "UPDATE" method which are then broadcast to clients
listening using the "GET" method.

Signed-off-by: Russell King <rmk@armlinux.org.uk>

1 files changed, 21 insertions, 0 deletions

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+This is a very basic HTTP server, designed for real-time server sent
+event streams. BEWARE: the server offers little to no security
+features.
+
+The server supports:
+- the standard HTTP "GET" method for retrieval of events.
+- a custom "UPDATE" method to send events.
+- HTTP 1.0 and 1.1 connections. HTTP 1.1 uses chunked mode.
+
+The server is hard-coded to listen on TCP *:1180.
+
+Design
+------
+The design concept is:
+
+public ------ apache reverse ----- event ------ data gathering
+internet          proxy         httpd server      application
+
+The reverse proxy is responsible for controlling public access to the
+event streams served by the mini-httpd event server; the event server
+itself should not be publically accessible.