Emacs behind HTTP proxy

Question

Emacs is able to access the Internet with packages such as url.el or the W3 web browser.

Also, the Emacs Lisp Package Archive is heavily dependent on package url.el.

Now, how do I configure Emacs to use my HTTP proxy to connect to the Internet in general?

Bonus points for any help with ELPA behind a proxy.

Yes, I've had problems with HTTP proxies before.

Answer 1

Emacs populates the url-proxy-services variable from the http_proxy, https_proxy and no_proxy environment variables if they are set.

Answer 2

For w3m, this setting has worked for me:

(setq url-proxy-services '(("no_proxy" . "work\\.com")
                           ("http" . "proxy.work.com:911")))

Answer 3

I've got authorization working by:

(setq url-proxy-services
   '(("no_proxy" . "^\\(localhost\\|10\\..*\\|192\\.168\\..*\\)")
     ("http" . "proxy.com:8080")
     ("https" . "proxy.com:8080")))

(setq url-http-proxy-basic-auth-storage
    (list (list "proxy.com:8080"
                (cons "Input your LDAP UID !"
                      (base64-encode-string "LOGIN:PASSWORD")))))

Works for Emacs 24.3. It is based on non-public API tricks, so might not work in another Emacs versions...