Server Response: 412 null

rutyggi

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

rutyggi

After trying and trying again it works. Why is the server returning a 412 response?

dstillman

We can't provide support for Zoo here — you'll need to ask the Zoo developer.

rutyggi

But it's your server that is returning the 412 null error ....

dstillman

And if I send an invalid request at google.com, I'll get a 400 error. That doesn't make it Google's problem. Again, you need to ask them.