Quick and dirty way
Might have some unexpected quirks when it comes to the module system and relative paths, I haven't used it enough to say:
require([ "//host/myext/mod1/mod2.js" ],function(mod2){
// If current webpage is http:// or https:// or file://
// it tries to use the same protocol
});
Better way
Configure require() to treat all modules that start with a certain package name (e.g. foo) as coming from a particular URL. From your starter page, something like:
<script src="dojo/dojo.js"
data-dojo-config="packages:[{name:'myext',location:'//host/js/myext'}], async: 1, >
</script>
This lets you vastly improve your first example to:
require([ "myext/mod1/mod2" ],function(mod2){
});
If you are using a Dojo Bootstrap installation instead, you can avoid touching your data-dojo-config and instead put it inside the run.js startup file:
require({
baseUrl: '',
packages: [
'dojo',
'dijit',
'dojox',
'myapp',
{ name: 'myext', location: '//host/js/myext', map: {} }
]
}, [ 'myapp' ]);