404. That’s an error.

The requested URL /custom?q=%22CategoryProgramming%22&client=google-coop-np&cof=FORID:13%3BAH:left%3BS:http://www.emacswiki.org/%3BCX:Emacs%2520Wiki%2520Search%3BL:http://www.emacswiki.org/emacs_rss.png%3BLH:43%3BLP:1%3BVLC:%23551a8b%3BDIV:%23cccccc%3B&cx=004774160799092323420:6-ff2s0o6yi&adkw=AELymgV2CkwX2nq0Mk-EPl0LpNeXFZ80h5z7Sp-ObDNAgoT3qcbK04PARqOK_gVdFMtlB4R1Y7ViNnZkLI0mTAc2vPt2-M7yZtqUB2660VR_ZzegoPg_AZk&hl=en&boostcse=0&ie=UTF-8&oe=UTF-8&prmd=ivns&ei=zYK2VuiAIMXtPYG_jZgI&start=40&sa=N was not found on this server. That’s all we know.