url-retrieve-synchronously unexpectedly returns an empty buffer: emacs -Q --eval '(with-current-buffer (url-retrieve-synchronously " https://google.com") (print (buffer-string)))' --batch Contacting host: google.com:443 "" If I add (sit-for 2) in url-retrieve-synchronously after the (url-retrieve ...) call: (setq asynch-buffer (url-retrieve url (lambda (&rest ignored) (url-debug 'retrieval "Synchronous fetching done (%S)" (current-buffer)) (setq retrieval-done t asynch-buffer (current-buffer))) nil silent inhibit-cookies)) (sit-for 2) then I see the expected output. In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5) of 2019-09-22, modified by Debian built on x86-grnet-01 Windowing system distributor 'The X.Org Foundation', version 11.0.12004000 System Description: Debian GNU/Linux 10 (buster) Recent messages: var a=window.location,b=a.href.indexOf(\"#\");if(0<=b){var c=a.href.substring(b+1);/(^|&)q=/.test(c)&&-1==c.indexOf(\"#\")&&a.replace(\"/search?\"+c.replace(/(^|&)fp=[^&]*/g,\"\")+\"&cad=h\")};

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" completing-read-default: Command attempted to use minibuffer while in minibuffer Quit [2 times] Configured using: 'configure --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --build x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib --localstatedir=/var/lib --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd --with-pop=yes --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp --with-sound=alsa --without-gconf --with-mailutils --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/emacs-StqULU/emacs-26.1+1=. -fstack-protector-strong -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LIBSYSTEMD LCMS2 Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Emacs-Lisp Minor modes in effect: text-scale-mode: t diff-auto-refine-mode: t hi-lock-mode: t global-erjoalgo-command-mode: t erjoalgo-command-mode: t company-mode: t show-paren-mode: t global-text-scale-mode: t tooltip-mode: t global-eldoc-mode: t eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t column-number-mode: t line-number-mode: t transient-mark-mode: t Load-path shadows: /home/ealfonso/quicklisp/dists/quicklisp/software/slime-v2.24/slime-tests hides /home/ealfonso/.emacs.d/elpa/slime-20191224.2328/slime-tests /home/ealfonso/quicklisp/dists/quicklisp/software/slime-v2.24/slime-autoloads hides /home/ealfonso/.emacs.d/elpa/slime-20191224.2328/slime-autoloads /home/ealfonso/quicklisp/dists/quicklisp/software/slime-v2.24/slime hides /home/ealfonso/.emacs.d/elpa/slime-20191224.2328/slime /home/ealfonso/git/autobuild/autobuild hides /home/ealfonso/git/dotemacs/lisp/core/autobuild /home/ealfonso/.emacs.d/elpa/s-20180406.808/s hides /home/ealfonso/git/dotemacs/lisp/libs/s /home/ealfonso/.emacs.d/elpa/dash-20191109.1327/dash hides /home/ealfonso/git/dotemacs/lisp/libs/dash /home/ealfonso/quicklisp/dists/quicklisp/software/slime-v2.24/contrib/slime-cl-indent hides /home/ealfonso/git/dotemacs/lisp/libs/slime-cl-indent Features: (shadow sort mailalias mail-extr emacsbug misearch 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