I'm trying to configure Dynamic DNS client on my router with dd-wrt (v24-sp2) firmware so it would dynamically change IP address in one of the DNS records. Unfortunately I encountered a problem… Here is an example request from their ddclient configuration:

https://www.cloudflare.com/api.html?a=DIUP&u=<my_login>&tkn=<my_token>&ip=<my_ip>&hosts=<my_record> 

It works if I use it in browser, but in dd-wrt I get this output:

Tue Jan 24 00:36:47 2012: INADYN: Started 'INADYN Advanced version 1.96-ADV' - dynamic DNS updater. 
Tue Jan 24 00:36:47 2012: I:INADYN: IP address for alias '<my_record>' needs update to '<my_ip>' 
Tue Jan 24 00:36:48 2012: W:INADYN: Error validating DYNDNS svr answer. Check usr,pass,hostname! (HTTP/1.1 303 See Other 
Server: cloudflare-nginx 
Date: Mon, 23 Jan 2012 14:36:48 GMT 
Content-Type: text/plain 
Connection: close 
Expires: Sun, 25 Jan 1981 05:00:00 GMT 
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 
Pragma: no-cache 
Location: https://www.cloudflare.com/api.html?a=DIUP&u=<my_login>&tkn=<my_token>&ip=<my_ip>&hosts=<my_record> 
Vary: Accept-Encoding 
Set-Cookie: __cfduid=<id>; expires=Mon, 23-Dec-2019 23:50:00 GMT; path=/; domain=.cloudflare.com 
Set-Cookie: __cfduid=<id>; expires=Mon, 23-Dec-2019 23:50:00 GMT; path=/; domain=.www.cloudflare.com 

You must include an `a' paramiter, with a value of DIUP|wl|chl|nul|ban|comm_news|devmode|sec_lvl|ipv46|ob|cache_lvl|fpurge_ts|async|pre_purge|minify|stats|direct|zone_check|zone_ips|zone_errors|zone_agg|zone_search|zone_time|zone_grab|app|rec_se

URL from "Location" works perfectly and parameter "a" is included. What's the problem?