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https://www.virtualbox.org/ticket/9069

Google for 'virtualbox sendfile' and there's a lot of discussion.

Worth noting, and this bit me recently, Go's http file handler also uses sendfile beneath the covers.

Yes, this StackOverflow answer solved the mystery for me http://stackoverflow.com/questions/12719859/syntaxerror-unex...

I then found out that it is actually mentioned in the Vagrant docs also: https://docs.vagrantup.com/v2/synced-folders/virtualbox.html

Haha omg this issue. I came across this about a year ago, and it took forever to diagnose the problem. Who would think to look for a specific declaration in the web server config? I thought for the longest time it was a problem with my host<->guest mount. Glad to see other people suffering similarly :p