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.
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
console.warn(xhr.responseText) and you will most likely see the HTML that is being received.