Proxy server guide

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import Vapi from '@vapi-ai/web';
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const vapi = new Vapi('your-token', 'https://your-proxy.com');
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// Second parameter is your backend/proxy service URL. Without this, calls route to Vapi API directly.
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vapi.start({
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  userId: 'customer123',
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  assistantType: 'sales-coach',
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  // Send any custom data your backend needs
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});

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export default {
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  async fetch(request, env, ctx) {
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    const url = new URL(request.url);
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    // Basic CORS support (adjust origins/headers to your needs)
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    const corsHeaders = {
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      'Access-Control-Allow-Origin': '*',
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      'Access-Control-Allow-Methods': 'POST, OPTIONS',
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      'Access-Control-Allow-Headers': 'Content-Type, Authorization'
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    };
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    if (request.method === 'OPTIONS') {
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      return new Response(null, { status: 204, headers: corsHeaders });
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    }
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    // Handle Vapi API calls
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    if (url.pathname.startsWith('/call')) {
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      try {
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        const { userId, assistantType, ...rest } = await request.json();
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        const assistantConfig = getAssistantConfig(userId, assistantType, rest);
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        const response = await fetch(`https://api.vapi.ai${url.pathname}`, {
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          method: 'POST',
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          headers: {
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            Authorization: `Bearer ${env.VAPI_API_KEY}`,
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            'Content-Type': 'application/json',
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          },
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          body: JSON.stringify(assistantConfig),
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        });
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        return new Response(response.body, {
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          status: response.status,
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          headers: { 'Content-Type': 'application/json', ...corsHeaders },
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        });
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      } catch (error) {
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        return new Response(JSON.stringify({ error: 'Proxy error', details: String(error) }), {
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          status: 500,
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          headers: { 'Content-Type': 'application/json', ...corsHeaders },
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        });
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      }
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    }
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    return new Response('Proxy running', { headers: corsHeaders });
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  },
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};
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function getAssistantConfig(userId, assistantType) {
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  if (assistantType === 'existing') {
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    return { assistantId: 'YOUR_ASSISTANT_ID' };
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  }
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  return {
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    assistant: {
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      // Your transient assistant config here
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    },
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  };
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}