HTTP Proxies

philandstuff edited this page Nov 10, 2014 · 14 revisions

If you are using Leiningen 2.x behind an HTTP proxy you need to set the http_proxy environment variable before launching Leiningen.

In Linux/Unix put this in ~/.profile:


Or in Windows:


Non-proxy hosts

To supply a list of hosts for which Lein should bypass the configured proxy, set the http_no_proxy environment variable:


Leiningen uses clj-http which is built on the Apache HttpComponents Client. This means that to set non-proxy hosts you're required to use the Java format (pipe-delimited).

Since 2.1.2, if http_no_proxy is not set then Leiningen will attempt to use your system's existing no_proxy environment variable to define non-proxy hosts. The format of the no_proxy value is likely to be incompatible with the clj-http proxy selector, so Leiningen will attempt to convert the value. For instance, the following value:


is equivalent to:


NTLM proxies

If you are running a linux system behind an NTLM proxy the initial install may fail with a message containing the following:

org.apache.http.client.protocol.RequestAuthenticationBase process
WARNING: NTLM authentication error: Credentials cannot be used for NTLM authentication: org.apache.http.auth.UsernamePasswordCredentials

This happens when NTLM block certain terminal commands (e.g. wget)

One solution is to install cntlm, an intermediate proxy, which forwards requests through to the NTLM proxy with domain authentication. You will need to configure your proxy url, username, password (or better, hashed versions, see the "cntlm -H" option) and your domain in the cntlm.conf file. Your system proxy settings (e.g. $http_proxy env variable) must then be changed to point to the cntlm proxy (default http://localhost:3128).

SOCKS Proxies

If you are using Leiningen 2.x behind a SOCKS proxy, you might find that getting the JVM to cooperate with your proxy can be very frustrating. It is easiest, then, to turn your SOCKS proxy into an HTTP proxy using Privoxy. Go to and install the latest version, and at the end of the configuration file (found at /etc/privoxy/config on most Linux systems), add the following:

forward-socks5 / proxy_host:proxy_port .

Replacing proxy_host with your SOCKS proxy's hostname or IP, and proxy_port with your SOCKS proxy's port. Don't forget the period at the end! Then, follow the directions above for HTTP proxies.

For unexpected behaviours could be useful to check the get-proxy-settings function on

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