GNU bug report logs - #61916
30.0.50; url.el; Can not change User-Agent temporarily when url-retrieve

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Subject: 30.0.50; url.el;
 Can not change User-Agent temporarily when url-retrieve
User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue)
 FLIM-LB/1.14.9 (=?ISO-8859-4?Q?Goj=F2?=) APEL-LB/10.8 EasyPG/1.0.0
 Emacs/30.0.50 (x86_64-w64-mingw32) MULE/6.0 (HANACHIRUSATO)
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The following code cannot be used to temporarily change User-Agent

(require 'url)
(setq url-debug t)
(let ((url-user-agent "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36 Edg/110.0.1587.57"))
  (url-retrieve "https://httpbin.org/get?a=b" (lambda (_))))


Because the url-retrieve is asynchronous, when the url-user-agent is actually used (eg. url-http-create-request be called),
it may be out of the let scope.



In GNU Emacs 30.0.50 (build 5, x86_64-w64-mingw32)
Repository revision: 07a76a06f9a438e2a1bf1e565e3e78f7927c37f2
Repository branch: master
Windowing system distributor 'Microsoft Corp.', version 10.0.22621
System Description: Microsoft Windows 10 Home China (v10.0.2009.22621.1105)

Configured using:
 'configure --prefix=/d/emacs-build/pkg/master-x86_64 'CFLAGS=-Ofast -fno-finite-math-only -fomit-frame-pointer'
 --with-zlib --with-xpm --with-xml2 --with-tree-sitter --without-tiff --with-rsvg --with-png --with-lcms2 --with-json
 --with-jpeg --with-harfbuzz --with-gnutls --with-gif --without-cairo --disable-build-details --without-dbus
 --with-compress-install --with-small-ja-dic'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XPM ZLIB

Important settings:
  value of $LANG: CHS
  locale-coding-system: cp936

Major mode: ELisp/d