The startup module requests is only for anonymous users and cookieless. It is requested directly from the html using a url that includes the relevant timestamp.
Yet, looking in the logs, we see quite a few definition updates (which afaik can only come from startup module requests) having a request context that includes a user name:
```
2015-04-02 08:43:36 mw1027 plwiki: ResourceLoaderModule::getDefinitionMtime: New definition for module ext.globalCssJs.user in context "en|ltr|monobook|Bsadowski1|||||scripts|"
2015-04-02 08:43:36 mw1022 commonswiki: ResourceLoaderModule::getDefinitionMtime: New definition for module ext.globalCssJs.user in context "fr|ltr|monobook|Linedwell|||||scripts|"
2015-04-02 08:44:49 mw1072 etwiki: ResourceLoaderModule::getDefinitionMtime: New definition for module user in context "et|ltr|vector|Kardulas||||||20150219T154650Z"
2015-04-02 08:45:54 mw1253 simplewiki: ResourceLoaderModule::getDefinitionMtime: New definition for module user in context "en-gb|ltr|vector|Thrasymedes|||||scripts|"
2015-04-02 08:45:55 mw1257 frwiki: ResourceLoaderModule::getDefinitionMtime: New definition for module user in context "fr|ltr|monobook|Prosopee|||||scripts|"
2015-04-02 08:45:57 mw1038 frwiki: ResourceLoaderModule::getDefinitionMtime: New definition for module user in context "fr|ltr|vector|Meixang||||||20150313T153236Z"
2015-04-02 08:46:41 mw1088 commonswiki: ResourceLoaderModule::getDefinitionMtime: New definition for module user in context "en|ltr|vector|El Grafo|||||scripts|"
2015-04-02 08:47:08 mw1081 hiwiki: ResourceLoaderModule::getDefinitionMtime: New definition for module ext.globalCssJs.user in context "hi|ltr|vector|Shrikarsan|||||scripts|"
2015-04-02 08:47:36 mw1219 dewiktionary: ResourceLoaderModule::getDefinitionMtime: New definition for module ext.globalCssJs.user in context "de|ltr|vector|Atamari|||||scripts|"
2015-04-02 08:47:57 mw1183 fawiki: ResourceLoaderModule::getDefinitionMtime: New definition for module user.groups in context "fa|rtl|vector|Far-gh||||||"
2015-04-02 08:48:07 mw1022 enwiki: ResourceLoaderModule::getDefinitionMtime: New definition for module user.groups in context "en|ltr|vector|MartinPoulter||||||"
2015-04-02 08:48:33 mw1107 fawiki: ResourceLoaderModule::getDefinitionMtime: New definition for module ext.globalCssJs.user in context "it|ltr|vector|Nastoshka|||||scripts|"
```
* user
* user.groups
* ext.globalCssJs.user