Breaking changes:

Removed port setting (fixes #9)
Throw errors when weird/faulty matrix url (work on #10)
Added neturl for url parsing

validate_server.lua

@@ -0,0 +1,21 @@
+local url = require "net.url"
+
+function validate_server(hs_url)
+  u = url.parse(hs_url):normalize()
+
+  if not (u.host and u.scheme) then
+    return error("'"..hs_url.."' doesn't look like a valid url. Please specify scheme (http/s) and hostname")
+  end
+
+  if u.port and u.port == 8448 and u.scheme == 'http' then
+    return error("Port 8448 is for https, make sure your homeserver URL is correct")
+  end
+
+  if u.port and u.port == 8008 and u.scheme == 'https' then
+    minetest.log("warn", "Port 8008 is not https, make sure your homeserver URL is correct")
+  end
+
+  return hs_url
+end
+
+