--- url-http.el	2006-05-06 18:32:00.000000000 -0400
+++ /home/happy/src/emacs/multi-tty/lisp/url/url-http.el	2006-05-06 13:54:59.000000000 -0400
@@ -264,10 +273,13 @@
              ;; If-modified-since
              (if (and (not no-cache)
                       (member url-request-method '("GET" nil)))
-                 (let ((tm (url-is-cached (or proxy-obj url))))
-                   (if tm
-                       (concat "If-modified-since: "
-                               (url-get-normalized-date tm) "\r\n"))))
+                 (let ((cache-info (url-is-cached (or proxy-obj url))))
+                   (if cache-info
+                       (concat "If-Modified-Since: "
+                               (url-get-normalized-date (car cache-info)) "\r\n"
+			       (if (cadr cache-info)
+				   (concat "If-None-Match: " (cadr cache-info) "\r\n"))))))
+		     
              ;; Whence we came
              (if ref-url (concat
                           "Referer: " ref-url "\r\n"))