html image inlining

I didn't know about this
Nice

I've been inlining in emails, but for web I was always using a separate script to
give out images for which links should not be known like:
<img src="getImage?id=bla">
<img src="getImage?id=bla2">
where getImage only works if a user is signed in or something.
Now I can turn more round trips into one if images are not big using something like

<img
src="data:image/gif;base64,
R0lGODlhAwEgAPcAAP///87OzqWlpYSEhHNzc2tra1paWiEYGQv+E
AP/OGP/OAM7Oxr29xjEA/2MA/5wA/+8A/+dK79573ta8AGAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAIpHuDBABsMANrb8JqF0gFxG+XAAHeqe2S+
Rh//hEFwEiA8ENJPN8K6NawcWA50CCLMnw7kUa/p
Rdrpco7uOexAMKBLYPpNlxAZ6DAnJlm7WlavA4FANR0Kg9CEAC
BAQAOw==
" >