Use builtin or git `org'

README.org

@@ -399,7 +399,7 @@ version.
     ;; Install and require `no-littering'.
     (package-install 'no-littering)
     (require 'no-littering)
-    (package-upgrade 'org)
+    ;; (package-upgrade 'org) ; Use builtin or git!
     ;; Install the selected packages.
     (package-install-selected-packages)))
 
@@ -6952,6 +6952,50 @@ GET https://pypi.org/simple/numpy
 Accept: application/vnd.pypi.simple.latest+json
 #+end_src
 
+*** [[info:url#Top][URL (info)]]                                                     :noexport:
+:PROPERTIES:
+:CUSTOM_ID: sec:url
+:END:
+
+[[https://lists.gnu.org/archive/html/emacs-devel/2024-03/msg00670.html][How to retrieve only URL metadata]]
+
+#+caption[Make an URL HEAD request]:
+#+caption: Make an URL HEAD request.
+#+name: lst:url-head-request
+#+header: :wrap "src text -n :eval no"
+#+begin_src emacs-lisp -n :eval never-export :exports both :tangle no
+(with-current-buffer
+    (let ((url-request-method "HEAD"))
+      (url-retrieve-synchronously "https://www.gnu.org/"))
+  (buffer-string))
+#+end_src
+
+#+caption[URL HEAD request result]:
+#+caption: URL HEAD request result.
+#+name: lst:url-head-request-result
+#+RESULTS: lst:url-head-request
+#+begin_src text -n :eval no
+HTTP/1.1 200 OK
+Date: Wed, 27 Mar 2024 07:40:07 GMT
+Server: Apache/2.4.29
+Content-Location: home.html
+Vary: negotiate,accept-language,Accept-Encoding
+TCN: choice
+Strict-Transport-Security: max-age=63072000
+X-Frame-Options: sameorigin
+X-Content-Type-Options: nosniff
+Access-Control-Allow-Origin: (null)
+Accept-Ranges: bytes
+Cache-Control: max-age=0
+Expires: Wed, 27 Mar 2024 07:40:07 GMT
+Content-Length: 9803
+Keep-Alive: timeout=5, max=100
+Connection: Keep-Alive
+Content-Type: text/html
+Content-Language: en
+
+#+end_src
+
 *** [[https://www.emacswiki.org/emacs/WebJump][Webjump]]
 :PROPERTIES:
 :CUSTOM_ID: sec:webjump