Find Available PDFs doesn't find some available PDFs

  • edited November 16, 2018
    I used the "Find Available PDFs" on about 700 items and Zotero downloaded about 200 PDFs. The remaining PDFs are from journals not subscribed by my work organization. I can get to these PDFs if I login to my university account and have .prox part in the URL.

    Can I setup the find PDF feature to use the .prox version of the URL?

    Example before and after URL:
    https://www.sciencedirect.com/science/article/pii/S2352340918303950
    https://www-sciencedirect-com.prox.lib.ncsu.edu/science/article/pii/S2352340918303950

    If something automatic is not possible for the 500 odd remaining items, how can I do this manually for each item? Currently, the DOI and URL for these items takes me to the non-prox website. I have "enable proxy redirection" checked in the browser connector preferences.
  • Can you connect to your universiry’s VPN? If so, do that and the Find Available PDFs option should retrieve them.
  • Yeah, we mentioned this in the announcement:
    This will work if you have direct or VPN-based access to the PDF. If you use a web-based proxy, only open-access PDFs will be automatically retrieved using this new functionality, but you can continue to save items with gated PDFs from the browser using the Zotero Connector.
    We're hoping to support web-based proxies for Find Available PDF in a future version.
  • Thanks, all. I'll try the VPN and report back if I have issues.

    @danstillman Just FYI, overall this feature worked smooth and fast, so thanks a bunch for getting this implemented.

  • I was able to install and connect using Cisco AnyConnect VPN client software. However, I still cannot get Zotero to download the PDF/s. For an example item, where the find PDF does not work, if I click on the DOI or URL field in Zotero, it opens the web page and auto-redirects using the proxy, and the web proxied page allows me to download the PDF.

    Do I need to manually change the proxy settings in Firefox (General > Network Proxy) or IP addresses in my internet connection? Can't find anything along these lines on the NCSU website.
  • Do you have access to the PDF if you disable proxy redirection, then click the DOI link?
  • edited November 17, 2018
    Part 1
    With proxy redirection disabled but Cisco VPN connected, I do not have access to the PDF.

    The automatic installation did not work for me, so I went the manual route.
    https://oit.ncsu.edu/campus-it/campus-data-network/vpn/vpn-installation-instructions-for-windows/

    Part 2
    I also have a ScienceDirect login through my work that lets me access many but not all papers. At home, when I go through this login, about half of the pending ScienceDirect papers are available for download. Note that with this login, the URL does not get any "prox" suffix and stays exactly how it appears in the item metadata in Zotero. But Zotero cannot pull these PDFs.

    Part 1 is clearly not a Zotero problem. And likely part 2 is also not a Zotero issue, but for a moment I thought that would work and then was disappointed it did not.
  • When Zotero downloads files directly, that's totally separate from your browser, so anything that involves a web-based login won't help with Find Available PDF right now.

    A direct or VPN-based connection that gives you system-wide, non-login-based access to PDFs will work.
  • edited November 17, 2018
    Thanks, Dan. For now, I am working my way manually through these pending PDFs. No clue why the VPN login is not making the PDFs available to me - I'll look in to that (again) later.

    *Update* I think this is why the VPN is not working:
    https://www.lib.ncsu.edu/faq/when-i-use-the-vpn-why-do-i-have-to-authenticate-to-get-access-to-library-resources-like-e
  • Yes, that would be it
  • edited November 18, 2018
    I setup a VPN to another university and re-ran the "Find Available PDFs". No split tunneling here, so it worked but I found another issue. There are two "types" of journals/articles for which the PDF is available via VPN (without any web based login).

    Type 1: the link to download the PDF on the article webpage actually downloads the PDF file. No issues here. Mostly at ACS, SAGE, etc.

    Type 2: the "Download PDF" link opens the PDF in a separate browser window. Zotero was unable to auto-download the PDFs for these. Mostly at ScienceDirect:
    https://www.sciencedirect.com/science/article/pii/S0021850218301642

    *Update* I found articles that are Type 1, but Zotero cannot get PDF. So maybe the issue is something different than my initial guess.
    https://www.sciencedirect.com/science/article/pii/S1361920916308197
    https://ieeexplore.ieee.org/document/6896636

    Any help or solutions?
  • @dstillman What might be causing that last issue mentioned above?
  • I think the way Elsevier handles DOI resolution (which goes through an intermediary page) might be breaking Zotero's ability to automatically get the PDF from them. Not sure about IEEE.
  • Anything I can do at my end to improve/fix this?
  • When connected via the VPN and no web-based proxy, does Zotero save the PDF for this one using the Save to Zotero button in your browser? If so, but it doesn't work for Find Available PDF, could I see a Debug ID from Zotero for a Find Available PDF attempt? If it doesn't work via Save to Zotero either, I'd want to see a Debug ID from the Zotero Connector for a save attempt. There is an intermediate page here for the PDF download, but the translator should be able to extract the URL from it, and that should work the same in the Zotero Connector and in Zotero.
    For this one, the page itself is being generated via JavaScript, and Find Available PDF doesn't currently work for such pages. That one is a bit tricky, but I've created an issue to track it.
  • edited 23 days ago
    With only VPN and no web-based proxy or login, Zotero was able to download PDF for each of these three when creating the item using the Firefox browser connector:
    1. https://www.sciencedirect.com/science/article/pii/S0021850218301642
    2. https://www.sciencedirect.com/science/article/pii/S1361920916308197
    3. https://ieeexplore.ieee.org/document/6896636

    The debug output for #2 is: D2016402217
  • edited 23 days ago
    OK, @adamsmith was right — the intermediate page Elsevier uses for DOI resolution was breaking this. But there's then another problem with translating the ScienceDirect page in Zotero (though not the Connector) that we'll need to resolve. We have a fix for that, but we're still evaluating it to make sure it's OK to roll out.
  • OK, thanks. I have a few hundred items for which I can download PDFs but not through the "Find Available PDF" function. For each of these:
    1. I could create a new item via the connector and merge with the old one. Or,
    2. Download the PDF and then attach it using Zotfile

    Both methods will have to be one item at a time end to end. I believe it's not possible that I first download all hundreds of PDFs (manually) in to an empty folder and then in just a couple clicks have Zotero (or Zotero+Zotfile) attach them to the correct items in a dedicated collection or selected by me? Or, any other suggestion to minimize the number of clicks/time?
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