Zotero standalone behind proxy
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This should help for saving of PDFs and other files from gated resources via the connectors with Standalone open. For institutions that proxy Google Scholar), this should also allow "Retrieve Metadata from PDF" to work.
If you're having trouble syncing with a PAC file enabled, this change might help, but it's not really intended to, since I'm still not sure what's causing that for some people (since the Zotero servers should never be proxied).
If you're using a PAC-based proxy to access gated resources and want to test this now (which would be great), you can build Standalone yourself from the 4.0 branch. Otherwise, this change will be in 4.0.13.
proxy authentication sort of works, but does not work as it should as of 4.0.29.10.
I am behind a manually configured proxy (i.e., configured getting in about config and entering data in network.proxy.ssl, network.proxy.ssl_port and network.proxy.type = 1).
The issue is that zotero standalone does not require the proxy authentication on startup, as your post suggests.
Only when one tries to download a paper from the browser, zotero standalone asks for the authentication. Unfortunately this is too late for the download to succeed. Only trying the download again, the proxy is found to work and the download succeeds.
https://forums.zotero.org/discussion/59916/