Large image uploads crashing
<img width="720" alt="screenshot 2017-06-15 14 28 55" src="https://user-images.githubusercontent.com/1923260/27202599-136b78d8-51d7-11e7-8a47-70c718d4f004.png">

Everything on this library has been working wonderfully, so first of all: thank you so much! 

I noticed recently that we're failing on large image uploads (somewhere in the range of 3mb+) on the server side. Above is a log on the server.

Is this an inherent issue with post requests coming through gql? Or is there something we should be doing to handle larger images better?

Thank you!