@app.post("/")
def generate(prompt: str) -> str:
    resp = ...  # API works
    return resp.json()['url']

import httpx
import uuid

from fastapi.responses import FileResponse
from fastapi import HTTPException

@app.post("/")
def generate(prompt: str) -> str:
    resp = ...  # same as above

    # Add the code below
    file_id = str(uuid.uuid4())
    with httpx.Client() as client:
        # Download the artifact
        response = client.get(url)

        # Check if the request was successful
        if response.status_code == 200:
            # Then resave it
            with open(f"./downloaded/{file_id}.glb", "wb") as file:
                file.write(response.content)

    return file_id

@app.get("/artifact/{file_id}")
def download(file_id: str) -> FileResponse:
    if os.path.exists(f"./downloaded/{file_id}.glb"):
      return FileResponse(f"./downloaded/{file_id}.glb")
    raise HTTPException(status_code=404, detail="Item not found")

https://app.example.com/artifact/<file_id>

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

async function handleRequest(request) {
  // Parse the request URL
  const url = new URL(request.url);

  // Get the target URL from the 'url' query parameter
  const targetUrl = url.searchParams.get('url');

  // If no URL is provided, return an error
  if (!targetUrl) {
    return new Response('Please provide a URL parameter', {
      status: 400,
      headers: {
        'Content-Type': 'text/plain',
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type'
      }
    });
  }

  // Handle preflight OPTIONS request
  if (request.method === 'OPTIONS') {
    return handleCORS();
  }

  try {
    // Fetch the file from the target URL
    const response = await fetch(targetUrl);

    // If the fetch failed, return the error
    if (!response.ok) {
      return new Response(`Failed to fetch from target URL: ${response.statusText}`, {
        status: response.status,
        headers: corsHeaders()
      });
    }

    // Get the content type from the response or default to octet-stream
    const contentType = response.headers.get('Content-Type') || 'application/octet-stream';

    // Get the content disposition or create one from the URL
    let contentDisposition = response.headers.get('Content-Disposition');
    if (!contentDisposition) {
      // Extract filename from the URL
      const fileName = targetUrl.split('/').pop().split('?')[0] || 'file';
      contentDisposition = `attachment; filename="${fileName}"`;
    }

    // Create a new response with CORS headers
    const newResponse = new Response(response.body, {
      status: response.status,
      statusText: response.statusText,
      headers: {
        'Content-Type': contentType,
        'Content-Disposition': contentDisposition,
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'GET, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type',
        'Cache-Control': 'public, max-age=3600' // Cache for 1 hour
      }
    });

    return newResponse;
  } catch (error) {
    return new Response(`Error fetching the file: ${error.message}`, {
      status: 500,
      headers: corsHeaders()
    });
  }
}

// Handle CORS preflight requests
function handleCORS() {
  return new Response(null, {
    status: 204, // No content
    headers: corsHeaders()
  });
}

// Create CORS headers object
function corsHeaders() {
  return {
    'Access-Control-Allow-Origin': '*',
    'Access-Control-Allow-Methods': 'GET, OPTIONS',
    'Access-Control-Allow-Headers': 'Content-Type',
    'Access-Control-Max-Age': '86400' // 24 hours
  };
}

fetch('https://your-worker-url.workers.dev/?url=<target_url>')
  .then(response => response.blob())
  .then(blob => {
    // Create a download link
    const url = window.URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'downloaded-file.pdf';
    document.body.appendChild(a);
    a.click();
    a.remove();
  })
  .catch(error => console.error('Error:', error));