Batch Rest API Problems

Hi Simon Dodd. I think the main issue here is that it's a batched GET. The *_DATA parameter is only passed for other verbs. For a GET, the data should be part of the query string.

One other item worth noting, but probably not the cause of your issue, is that _REQUEST_0_SEQUENTIAL won't work as-is. Sequential is a single parameter that applies to all of the requests included in the batch, and should be named just "Sequential". 

A potentially easier way to test batching is to use the JavaScript wrapper. You can perform the following in the browser's script console against the platform, calling any random REST requests you like within the wrapper:

// initiate a batch scope
$.telligent.evolution.batch(function() {

	// all rest requests in here will be batched

	$.telligent.evolution.get({
		url: $.telligent.evolution.site.getBaseUrl() + 'api.ashx/v2/users/{username}.json',
		data: { username: 'user1' }
	}).then(function(r1){
		console.log(r1);
	});

	$.telligent.evolution.get({
		url: $.telligent.evolution.site.getBaseUrl() + 'api.ashx/v2/users/{username}.json',
		data: { username: 'user2' }
	}).then(function(r2){
		console.log(r2);
	});	

}, { sequential: false });

And then you can inspect what HTTP parameters are actually sent to the batch endpoint.

Hope this helps!