DoH GET additional parameters + tests

modules/http/http_doh.lua

@@ -15,7 +15,10 @@ local function serve_doh(h, stream)
 	if method == 'POST' then
 		input = stream:get_body_chars(1025, 2)  -- read timeout = KR_CONN_RTT_MAX
 	elseif method == 'GET' then
-		local input_b64 = string.match(h:get(':path'), '^/doh%?dns=([a-zA-Z0-9_-]+)$')
+		local input_b64 = string.match(h:get(':path'), '^/doh%?dns=([a-zA-Z0-9_-]+)$') or
+				string.match(h:get(':path'), '^/doh%?dns=([a-zA-Z0-9_-]+)&') or
+				string.match(h:get(':path'), '^/doh%?.*&dns=([a-zA-Z0-9_-]+)$') or
+				string.match(h:get(':path'), '^/doh%?.*&dns=([a-zA-Z0-9_-]+)&')
 		if not input_b64 then
 			return 400, 'base64url query not found'
 		end