Don't make two requests to download PDF

[jviereck]

When we open a PDF, we make currently two requests to the server. You can easily see this when opening the web inspector tools. There are two GET requests to the PDF domain.

In most cases this is no problem, however sometimes the server allows to download the PDF only once. Then, when the second request happens, the PDF is no longer served and therefore the PDF is not loadable in PDF.JS.

[brendandahl]

This is expected. We cancel the original request in the extension and re-request in our code. Have you actually run into a pdf that is only downloadable once? I know it's possible (or the pdf served could be different on the second request) but I have yet to hear of anyone actually run into this.

[jviereck]

This is expected. We cancel the original request in the extension and re-request in our code. Have you actually run into a pdf that is only downloadable once? I know it's possible (or the pdf served could be different on the second request) but I have yet to hear of anyone actually run into this.

Yes, someone reached me in Berlin. Basically, the user have to pay to view the PDFs. That's why it's really only possible to request the PDF once.

Why don't we listen to the data coming in the first time?

[pelinquin]

I am facing the same issue. (see https://bugzilla.mozilla.org/show_bug.cgi?id=782217).
In my application, each GET request for a PDF starts an heavy task (run Python script with parser, dot, pdflatex,...) so I really don't want to run that twice.
AcrobatReader is able to render the PDF with only one request and the embedded Chromium PDF viewer also works well, so I don't see any reason to make it so with FF.

[yurydelendik]

Fixed by #1943

[jonny64]

still two requests in IE11 (pdf.js build 1.0.917 deeaee9 and 1.0.940 45ca953)
it was ok on pdf.js bd11111 03.04.2014
what can I do to prevent this? we have double-click protection on our server, which also prevents any download twice