An event that is raised when a request encounters an error.
    
    
    
    
    
    
        
| Name | Type | Description | 
|---|---|---|
| statusCode | Number | optional The HTTP error status code, such as 404. | 
| response | Object | optional The response included along with the error. | 
| responseHeaders | String | Object | optional The response headers, represented either as an object literal or as a string in the format returned by XMLHttpRequest's getAllResponseHeaders() function. | 
Members
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    The response included along with the error. If the error does not include a response, this property will be undefined.
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    The headers included in the response, represented as an object literal of key/value pairs. If the error does not include any headers, this property will be undefined.
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    The HTTP error status code, such as 404. If the error does not have a particular HTTP code, this property will be undefined.
