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install plugin
ionic plugin add https://github.com/apache/cordova-plugin-whitelist.git

in config.xml
<access origin="https://foo.se/api/*"/>

in index.html
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com foo.se https://foo.se; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' 'unsafe-eval';">
    <!--http://www.raymondcamden.com/2015/05/25/important-information-about-cordova-5-->
    <!--http://content-security-policy.com/-->
    
content of the meta tag can be read as:
default-src 'self' data: foo.se https://foo.se;
style-src 'self' 'unsafe-inline';
script-src 'self' 'unsafe-inline' 'unsafe-eval';