/etc/java-8-openjdk/net.properties is in openjdk-8-jre-headless 8u77-b03-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Default Networking Configuration File
#
# This file may contain default values for the networking system properties.
# These values are only used when the system properties are not specified
# on the command line or set programatically.
# For now, only the various proxy settings can be configured here.
############################################################
# Whether or not the DefaultProxySelector will default to System Proxy
# settings when they do exist.
# Set it to 'true' to enable this feature and check for platform
# specific proxy settings
# Note that the system properties that do explicitely set proxies
# (like http.proxyHost) do take precedence over the system settings
# even if java.net.useSystemProxies is set to true.
java.net.useSystemProxies=false
#------------------------------------------------------------------------
# Proxy configuration for the various protocol handlers.
# DO NOT uncomment these lines if you have set java.net.useSystemProxies
# to true as the protocol specific properties will take precedence over
# system settings.
#------------------------------------------------------------------------
# HTTP Proxy settings. proxyHost is the name of the proxy server
# (e.g. proxy.mydomain.com), proxyPort is the port number to use (default
# value is 80) and nonProxyHosts is a '|' separated list of hostnames which
# should be accessed directly, ignoring the proxy server (default value is
# localhost & 127.0.0.1).
#
# http.proxyHost=
# http.proxyPort=80
http.nonProxyHosts=localhost|127.*|[::1]
#
# HTTPS Proxy Settings. proxyHost is the name of the proxy server
# (e.g. proxy.mydomain.com), proxyPort is the port number to use (default
# value is 443). The HTTPS protocol handlers uses the http nonProxyHosts list.
#
# https.proxyHost=
# https.proxyPort=443
#
# FTP Proxy settings. proxyHost is the name of the proxy server
# (e.g. proxy.mydomain.com), proxyPort is the port number to use (default
# value is 80) and nonProxyHosts is a '|' separated list of hostnames which
# should be accessed directly, ignoring the proxy server (default value is
# localhost & 127.0.0.1).
#
# ftp.proxyHost=
# ftp.proxyPort=80
ftp.nonProxyHosts=localhost|127.*|[::1]
#
# Gopher Proxy settings. proxyHost is the name of the proxy server
# (e.g. proxy.mydomain.com), proxyPort is the port number to use (default
# value is 80)
#
# gopher.proxyHost=
# gopher.proxyPort=80
#
# Socks proxy settings. socksProxyHost is the name of the proxy server
# (e.g. socks.domain.com), socksProxyPort is the port number to use
# (default value is 1080)
#
# socksProxyHost=
# socksProxyPort=1080
#
# HTTP Keep Alive settings. remainingData is the maximum amount of data
# in kilobytes that will be cleaned off the underlying socket so that it
# can be reused (default value is 512K), queuedConnections is the maximum
# number of Keep Alive connections to be on the queue for clean up (default
# value is 10).
# http.KeepAlive.remainingData=512
# http.KeepAlive.queuedConnections=10
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