'loadHTML' doesn't need to call 'stringByReplacingImageURLsWithProxyURLs'
'loadHTML' doesn't need to call 'stringByReplacingImageURLsWithProxyURLs'

The proxy will have to perform 'stringByReplacingImageURLsWithProxyURLs' on the HTML it delivers when serving up article section html array JSON.

Edit preview still sends HTML to the 'loadHTML' 'string' parameter, but I don't think editing preview needs to proxy image urls because edit preview doesn't need to serve saved images.

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