We are going to make a request as follows:

// SNIPP SNIPP
{
  "requests": [
    {
     "image": {
"content": "/9j/7QBEUGhvdG9zaG9...base64-encoded-image-content...fXNWzvDEeYxxxzj/Coa6Bax//Z"
    },
    "features": [
      {
       "type": "FACE_DETECTION"
      }
    ]
   }
 ]
}
// SNIPP SNIPP

Note that the content property under the image property is the base64 encoded version of the image. In the same images folder, you should find a file named Face_Detection_SriDevi_base64.txt. This is the base64 version of the same image. You can use an online service such as https://www.browserling.com/tools/image-to-base64 or https://www.base64-image.de/ for converting your own image to a base64 string. Under features, we are requesting the FACE_DETECTION feature.