Cloudflare worker which runs flax.pics

flax.js

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
});

const default_image = 'https://i0.wp.com/images-prod.healthline.com/hlcmsresource/images/AN_images/flaxseeds-1296x728-feature.jpg?w=1155&h=1528';
const flaxes = [
  "https://i0.wp.com/images-prod.healthline.com/hlcmsresource/images/AN_images/flaxseeds-1296x728-feature.jpg?w=1155&h=1528",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcT6rY8sUlsTvYmlY_Pb_IY8-n3VDlGUiX02Eg&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTvw3pLRTTi_7mHbUhVIAK4nrIft3TutGEw7w&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTq9yGFnyVm3Cazw6p6h287w3HcYWqNjTIfug&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQai6G7o8I8uDoJ0It7BIDX_zyRFDue61ry1g&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcRCwB_H6yQsvgiR23zc3sibmB0toyUFknrV1w&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcR8s7AztwNgCHNym9shgM-m926qCM-Uc0P9yw&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQTHV2hd7kFad-4k2W26Rt2ZcwZcyjghFcPwQ&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcRzuRH63PQUK1CocBV3fku-PWEa6QgCz-rJQw&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTVGupbtgzjvYhq050GL6l_Kp3ajeC_EwtAvQ&usqp=CAU",
  "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcSQ1t2CdHK_WKMjZHH6kmRM2XtU9PO4dgpwuw&usqp=CAU"
];

async function fetchImage() {
  const imageUrl = flaxes[Math.floor(Math.random() * flaxes.length)];

  let imageFile = await fetch(imageUrl);
  let type = imageFile.headers.get('content-type');

  if (type.includes('text/plain')) {
    imageUrl = default_image;
    imageFile = await fetch(default_image);
    type = imageFile.headers.get('content-type');
  }

  let { readable, writable } = new TransformStream();
  imageFile.body.pipeTo(writable);

  return { url: imageUrl, file: readable, type };
}

async function handleRequest(request) {
  const { url, file, type } = await fetchImage();

  return new Response(file, {
    headers: {
      'x-original-url': url,
      'content-type': type
    }
  });
}