http.client FreeMarker Context Object is returning the error "html found in response"

Hi,

We are trying to get HTML/XML data from thirdparty API by using http.client FreeMarker Context Object.

E.X.:  <#assign response = http.client.request(API).header("Authorization", token).body("{ 'mode':'test'}", "application/xml").get()/>

The http.client.response FreeMarker Context Object (${response.error.message})  is returning the errror  "html found in response".

We even tried changing the Content-Type to "text/html" but same error we are reciving.

Your help could be highly appreciated.

Thanks & Regards,

Phani