307 is an HTTP error code and means "Temporary Redirect".

If you get a 307 response on you request, you used HTTP to access the AX Semeantics NLG Cloud API. In this case, use the HTTPS protocol to perform your API call.

That means: change the base URL from http://api.ax-semantics.com/  to https://api.ax-semantics.com/.

More information on HTTP and HTTPS error codes can be found here in RFC2616.
Further information on the AX Semantics API are found here.

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