Crawling through proxy

(from github.com/AlexKrivbass)
How can I set the properties for crawling through proxy with basic auth (user:pass)?

(from github.com/marevol)
Could you put the following settings to Config Parameters for Crawling Config?

client.proxyHost=hostname
client.proxyPort=1234
client.proxyUsername=username
client.proxyPassword=password