Function proxyServerInfoRequest

scripts/proxy-utils.mjs:69–185

(
  req,
  res,
  backendUrl,
  runtimeServicesInfo,
)

}

export function proxyServerInfoRequest(
  req,
  res,
  backendUrl,
  runtimeServicesInfo,
) {
  let backend;
  try {
    backend = parseBackendUrl(backendUrl);
  } catch {
    writeInvalidBackendUrlResponse(req, res);
    return;
  }

  const request = backend.protocol === "https:" ? httpsRequest : httpRequest;
  const proxyReq = request(
    {
      hostname: backend.hostname,
      port: backend.port,
      path: req.url,
      method: req.method,
      headers: {
        ...req.headers,
        host: `${backend.hostname}:${backend.port}`,
      },
    },
    (proxyRes) => {
      const chunks = [];

      proxyRes.on("data", (chunk) => {
        chunks.push(Buffer.from(chunk));
      });

      proxyRes.on("error", (err) => {
        if (!isBenignSocketError(err)) {
          console.error(`Upstream response error for ${req.url}:`, err.message);
        }
        if (!res.headersSent) {
          res.writeHead(502);
          res.end(`Bad Gateway: ${err.message}`);
        } else {
          res.destroy();
        }
      });

      proxyRes.on("end", () => {
        const statusCode = proxyRes.statusCode ?? 502;
        const headers = { ...proxyRes.headers };
        const originalBody = Buffer.concat(chunks);

        if (statusCode < 200 || statusCode >= 300 || req.method === "HEAD") {
          res.writeHead(statusCode, headers);
          res.end(req.method === "HEAD" ? "" : originalBody);
          return;
        }

        try {
          const serverInfo = JSON.parse(originalBody.toString("utf8"));