Safari: ProQuest translator same-origin processDocuments() is treated as cross-origin, loses cookies(?)

[AbeJellinek]

Reported: https://forums.zotero.org/discussion/comment/477452/#Comment_477452

ProQuest.js makes a processDocuments() request to grab the abstract page. ProQuest returns a login page ("Gain access through your school, library, or company"). Clicking the abstract link manually works fine, so ProQuest only thinks I'm not logged in when the request comes from the Connector's cross-origin request system. Makes me think that it's either not sending cookies or not routing through my SOCKS proxy. Connector cross-origin requests don't show up in the page's inspector panel, so I'm not sure how to figure out which it is.

I don't know much about the Safari Connector, but there's no obvious reason for this particular request to be processed as cross-origin, either - it's the same domain.

I haven't tried updating the translator to use async request methods.