Server Response: 412 null

edited May 26, 2021
I am using Zoo for Zotero and annotate the PDF on my tablet.

Then I close the PDF annotator application and Zoo for Zotero asks me if I want to upload the PDF.

I click Yes then it shows the error "Server Repsonse: 412 null"

I am positive the internet connection on the tablet works
  • After trying and trying again it works. Why is the server returning a 412 response?
  • We can't provide support for Zoo here — you'll need to ask the Zoo developer.
  • But it's your server that is returning the 412 null error ....
  • And if I send an invalid request at, I'll get a 400 error. That doesn't make it Google's problem. Again, you need to ask them.
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