net.http.server: Set request.ip so mod_http doesn't have to

Because it already sets request.secure, which depends on the connection,
just like the IP, so it makes sense to do both in the same place.

Dealing with proxies can be left to mod_http for now, but maybe it could
move into some util some day?

net/http/server.lua

@@ -113,6 +113,7 @@ local function noop() end
 function listener.onconnect(conn)
 	local session = { conn = conn };
 	local secure = conn:ssl() and true or nil;
+	local ip = conn:ip();
 	session.thread = async.runner(function (request)
 		local wait, done;
 		if request.partial == true then
@@ -127,6 +128,7 @@ function listener.onconnect(conn)
 	end, runner_callbacks, session);
 	local function success_cb(request)
 		--log("debug", "success_cb: %s", request.path);
+		request.ip = ip;
 		request.secure = secure;
 		session.thread:run(request);
 	end

plugins/mod_http.lua

@@ -260,7 +260,7 @@ local function is_trusted_proxy(ip)
 end
 
 local function get_ip_from_request(request)
-	local ip = request.conn:ip();
+	local ip = request.ip;
 	local forwarded_for = request.headers.x_forwarded_for;
 	if forwarded_for and is_trusted_proxy(ip) then
 		-- luacheck: ignore 631