Fix 'url-http-create-request' when cookies are used

* lisp/url/url-http.el (url-http-create-request): Make sure the
cookie headers are a unibyte string.  For the details, see
http://lists.gnu.org/archive/html/emacs-devel/2016-09/msg00202.html.

Copyright-paperwork-exempt: yes

1 files changed, 4 insertions, 3 deletions

diff --git a/lisp/url/url-http.el b/lisp/url/url-http.el
index bbe5268e4df..8f36ddeafbf 100644
--- a/lisp/url/url-http.el
+++ b/lisp/url/url-http.el
@@ -332,9 +332,10 @@ request.")
              auth
              ;; Cookies
              (when (url-use-cookies url-http-target-url)
-               (url-cookie-generate-header-lines
-                host real-fname
-                (equal "https" (url-type url-http-target-url))))
+               (url-http--encode-string
+                (url-cookie-generate-header-lines
+                 host real-fname
+                 (equal "https" (url-type url-http-target-url)))))
              ;; If-modified-since
              (if (and (not no-cache)
                       (member url-http-method '("GET" nil)))