INNER CODE UNIT · TypeScript

protocols

im4codes/imcodes · server/src/index.ts:605

  const protocols = protocolHeader ? protocolHeader.split(',').map((p) => p.trim()).filter(Boolean) : [];

  // 7. Generate wsId (32 hex chars, consistent with requestId format)
  const wsId = crypto.randomUUID().replace(/-/g, '');

  logger.info({
    serverId,
    previewId,
    wsId,
    path: upstreamPathWithQuery,
    protocols,
  }, 'Preview WS tunnel upgrade');

  // 8. Defer the browser handshake until the daemon reports the upstream-
  //    negotiated subprotocol (run 8a975732-23a P1.5.1), then complete the
  //    handshake echoing exactly that protocol so the browser's
  //    `WebSocket.protocol` matches the upstream end-to-end. The `ws` library
  //    echoes whatever `Sec-WebSocket-Protocol` the request carries, so we

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