The wording of the error message corresponds to what you get from Google Chrome when you run JSON.parse('<...'). I know you said the server is setting Content-Type: application/JSON, but I am led to believe the response body is actually HTML.
Feed.js:94 undefined "parsererror" "SyntaxError: Unexpected token < in JSON at position 0"
with the line console.error(this.props.url, status, err.toString()) underlined.
The err was actually thrown within jQuery and passed to you as a variable err. The reason that line is underlined is simply because that is where you are logging it.
I would suggest that you add to your logging. Looking at the actual XHR (XMLHttpRequest) properties to learn more about the response. Try adding a console. warn(xhr.responseText) and you will most likely see the HTML that is being received.
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