apply from: 'https://raw.github.com/akhikhl/gretty/master/pluginScripts/gretty.plugin' and Could not HEAD

[AmulyaSrinidhi]

Hello

We are trying to build gradle project with below properties. we are getting error message like below.

Could not get resource 'https://raw.github.com/akhikhl/gretty/master/pluginScripts/gretty.plugin'.

Could not HEAD 'https://raw.github.com/akhikhl/gretty/master/pluginScripts/gretty.plugin'.
> raw.github.com:443 failed to respond

gradle file.

apply plugin: 'java'
apply plugin: 'war'
apply from: 'https://raw.github.com/akhikhl/gretty/master/pluginScripts/gretty.plugin'
repositories {
mavenCentral()
jcenter()
}

gretty {
contextPath = '/'
}

dependencies {
}