I am starting to use WebLog Expert for web analytics. I created a report to see the analytics on PDFs on our website. I was seeing extraordinaryly high numbers for downloads. I posted a question on the WebLog Expert user forum and was told by a WLE employee that Adobe Reader makes multiple calls to the server per download. I need to confirm this, but I am also wondering why this would be so.
PDF files are designed so that they can be streamed in pieces. Unlike a movie, say, where this just allows viewers to skip forward or back, PDF readers (including Adobe Reader) may set up multiple connections, for example to download text more quickly than images, and fonts after that. In this way it's not unlike the way that a web pages pieces will have multiple connections to obtain all the elements.