It returns svg tag eg. <svg xmlns=“http://www.w3.org/2000/svg” xmlns:xlink=“http://www.w3.org/1999/xlink” width=“80” height=“80”> <circle style=“fill: #8b75b7;” cx=“40” cy=“40” r=“40” width=“80” height=“80”></circle><text style=“font-family: sans-serif;” x=“50%” y=“50%” alignment-baseline=“middle” text-anchor=“middle” dominant-baseline=“middle” font-size=“30” dy=".1em" fill="#FFFFFF" color="#FFFFFF">NK</text> </svg>

The reason you might have received text is because it got rendered. can you please try this via postman you will see the response body as mentioned above.