HTTP Proxies

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:

http_proxy=http://username:password@proxy:port
https_proxy=http://username:password@proxy:port

Or in Windows:

http_proxy=http://username:password@proxy:port
https_proxy=http://username:password@proxy:port

Non-proxy hosts

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

http_no_proxy="*.example1.com|*.example2.com|*.example3.com"

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:

no_proxy="example1.com,example2.com,example3.com"

is equivalent to:

http_no_proxy="*example1.com|*example2.com|*example3.com"

NTML proxies

If you are running a linux system behind an NTML 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 NTML block certain terminal commands (e.g. wget)

One solution is to install cntlm http://cntlm.sourceforge.net/, 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).

Another solution is to edit your lein shell script or lein.bat windows batch file and modify the curl command to use ntlm authentication

if type -p curl >/dev/null 2>&1; then
HTTP_CLIENT="curl -v --proxy-ntlm -x <proxyhost>:<port> -U <user>:<password> --insecure -f -L -o"  

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For unexpected behaviours could be useful to check the get-proxy-settings function on http://github.com/technomancy/leiningen/blob/master/leiningen-core/src/leiningen/core/classpath.clj#L86