modules/http: added an error handler to HTTP streams

Instead of throwing an error in the HTTP handler, server should log it.
This covers errors like client disconnecting before reading the response
body etc.

modules/http/http.lua

@@ -322,6 +322,16 @@ function M.add_interface(conf)
 		ctx = crt and tlscontext(crt, key),
 		tls = conf.tls,
 		onstream = routes,
+		-- Log errors, but do not throw
+		onerror = function(myserver, context, op, err, errno) -- luacheck: ignore 212
+			local msg = '[http] ' .. op .. ' on ' .. tostring(context) .. ' failed'
+			if err then
+				msg = msg .. ': ' .. tostring(err)
+			end
+			if verbose() then
+				log(msg)
+			end
+		end,
 	}
 	-- Manually call :listen() so that we are bound before calling :localname()
 	if s then