Today we disabled our HTTP access as announced last year. This implies that every request is now encrypted by default using TSL (also known as HTTPS) to protect your privacy. We now redirect all non-encrypted HTTP traffic to the corresponding HTTPS page (using a HTTP 301 response).
Some plugins and extensions that are using the REST API might have problems with the redirects. Please try to update the plugin or extension. If you still have problems with the plugin or extension, please contact us via email or Twitter.
Happy secure tagging,
Daniel