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[[networking_gradle]]
== Networking with Gradle

[[sec:accessing_the_web_via_a_proxy]]
== Accessing the web through a proxy

Configuring a proxy (for downloading dependencies, for example) is done via standard JVM system properties.

These properties can be set directly in the build script.
For example, setting the HTTP proxy host would be done with `System.setProperty('http.proxyHost', 'www.somehost.org')`.

Alternatively, the properties can be <<build_environment.adoc#sec:gradle_configuration_properties,specified in `gradle.properties`>>.

*Example 1:* Configuring an HTTP proxy using `gradle.properties`:
====
[source,properties]
----
systemProp.http.proxyHost=www.somehost.org
systemProp.http.proxyPort=8080
systemProp.http.proxyUser=userid
systemProp.http.proxyPassword=password
systemProp.http.nonProxyHosts=*.nonproxyrepos.com|localhost
----
====

There are separate settings for HTTPS.

*Example 2:* Configuring an HTTPS proxy using `gradle.properties`:
====
[source,properties]
----
systemProp.https.proxyHost=www.somehost.org
systemProp.https.proxyPort=8080
systemProp.https.proxyUser=userid
systemProp.https.proxyPassword=password
# NOTE: this is not a typo.
systemProp.http.nonProxyHosts=*.nonproxyrepos.com|localhost
----
====

There are separate settings for SOCKS.

*Example 3:* Configuring a SOCKS proxy using `gradle.properties`:
====
[source,properties]
----
systemProp.socksProxyHost=www.somehost.org
systemProp.socksProxyPort=1080
systemProp.java.net.socks.username=userid
systemProp.java.net.socks.password=password
----
====

You may need to set other properties to access other networks.

Helpful references:

* link:https://github.com/apache/ant/blob/master/src/main/org/apache/tools/ant/util/ProxySetup.java[ProxySetup.java in the Ant codebase^]
* link:https://docs.oracle.com/javase/8/docs/technotes/guides/net/proxies.html[JDK 8 Proxies^]

=== NTLM Authentication

If your proxy requires NTLM authentication, you may need to provide the authentication domain as well as the username and password.

There are 2 ways that you can provide the domain for authenticating to a NTLM proxy:

* Set the `http.proxyUser` system property to a value like `__domain__/__username__`.
* Provide the authentication domain via the `http.auth.ntlm.domain` system property.
