Whitelist domains that use custom header

[ruudboon]

Only some of my request require a authentication and don't want to send it to every domain.
Could we add some kind of white list of domains that should have this header?

this.imageLoaderConfig.setHttpRequestOptions({
  headers: {
    Authorization: 'Basic dGVzdHVzZXJuYW1lOnRlc3RwYXNzd29yZA=='
  }
});