Documentation of proxy settings is missing.

[tochi-y]

Proxy is supported in the source code.

personium-ex-httpclient/src/main/java/io/personium/engine/extension/httpclient/Ext_HttpClient.java

Lines 507 to 508 in c59098a

	// Proxy settings.
	builder.useSystemProperties();

But the documentation is missing. Then, I confirmed that adding following configurations to /opt/tomcat/conf/catalina.properties is properly worked.

# Proxy configuration.
java.net.useSystemProxies=true
http.nonProxyHosts=localhost|127.*|[::1]|*.personium.example
http.proxyHost=<ProxyHost>
http.proxyPort=<ProxyPort>
http.proxyUser=<ProxyUser>
http.proxyPassword=<ProxyPassword>
https.nonProxyHosts=localhost|127.*|[::1]|*.personium.example
https.proxyHost=<ProxyHost>
https.proxyPort=<ProxyPort>
https.proxyUser=<ProxyUser>
https.proxyPassword=<ProxyPassword>

This proxy configuration should be written in the documentation.