[PATCH] Add support for custom user agent strings in url.el

[Vibhav Pant <vibhavp@gmail.com>]

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I added support to url.el for a custom user agent string by defining a
variable url-custom-user-agent which contains a user-defined string. The
variable is nil by default, in which case the function
url-http-user-agent-string reutrns the default user agent.
(Patch was created on a git repository)

diff --git a/lisp/url/url-http.el b/lisp/url/url-http.el
index ac2e140..1b63a25 100644
--- a/lisp/url/url-http.el
+++ b/lisp/url/url-http.el
@@ -214,11 +214,15 @@ request.")
          (and (listp url-privacy-level)
               (memq 'agent url-privacy-level)))
       ""
-    (format "User-Agent: %sURL/%s\r\n"
-           (if url-package-name
-               (concat url-package-name "/" url-package-version " ")
-             "")
-           url-version)))
+    
+    (if url-custom-user-agent
+       (format "User-Agent: %s\n" url-custom-user-agent)
+      
+      (format "User-Agent: %sURL/%s\r\n"
+             (if url-package-name
+                 (concat url-package-name "/" url-package-version " ")
+               "")
+             url-version))))
 
 (defun url-http-create-request (&optional ref-url)
   "Create an HTTP request for `url-http-target-url', referred to by REF-URL."
diff --git a/lisp/url/url.el b/lisp/url/url.el
index cbbcfd4..c54a94e 100644
--- a/lisp/url/url.el
+++ b/lisp/url/url.el
@@ -51,6 +51,10 @@
   :type 'directory
   :group 'url)
 
+(defvar url-custom-user-agent nil
+  "User Agent used by url-http-create-request to fetch pages. If nil,
+the default user agent will be used.")
+
 (defun url-do-setup ()
   "Setup the URL package.
 This is to avoid conflict with user settings if URL is dumped with

- -- 
Vibhav Pant
vibhavp@gmail.com
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