export default {
  async fetch(request, env) {
    const cors = {
      'Access-Control-Allow-Origin': '*',
      'Access-Control-Allow-Methods': 'POST, OPTIONS',
      'Access-Control-Allow-Headers': 'Content-Type, x-api-key, anthropic-version',
    };
    if (request.method === 'OPTIONS')
      return new Response(null, { headers: cors });
    const body = await request.json();
    const resp = await fetch('https://api.anthropic.com/v1/messages', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'x-api-key': env.ANTHROPIC_KEY,
        'anthropic-version': '2023-06-01',
      },
      body: JSON.stringify(body),
    });
    const data = await resp.json();
    return new Response(JSON.stringify(data), {
      headers: { 'Content-Type': 'application/json', ...cors }
    });
  }
};