Loading JSON Test Data

I'm wondering if there's a way to have a json file, hosted locally or online, where I can create a bunch of test data and then load it into my GWT app and parse it like a RequestBuilder call. I've been looking online for a way to do this and nothing seems to work. I then tried putting together a php script to return some json, and even though it works in the browser and returns a 200 status code in my Charles web proxy, in GWT it returns a status code 0 and doesn't give me any data. The php file was not hosted locally and I have the php content type set to application/json. If there's another way to load this json that would be nice. I don't want to have to create these json objects from scratch in GWT.

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