Function abortUpgrade

packages/engine.io/lib/server.ts:1046–1069

* Close the WebSocket connection * * @param {net.Socket} socket * @param {string} errorCode - the error code * @param {object} errorContext - additional error context

(
  socket,
  errorCode,
  errorContext: { message?: string } = {},
)

 */

function abortUpgrade(
  socket,
  errorCode,
  errorContext: { message?: string } = {},
) {
  socket.on("error", () => {
    debug("ignoring error from closed connection");
  });
  if (socket.writable) {
    const message = errorContext.message || Server.errorMessages[errorCode];
    const length = Buffer.byteLength(message);
    socket.write(
      "HTTP/1.1 400 Bad Request\r\n" +
        "Connection: close\r\n" +
        "Content-type: text/html\r\n" +
        "Content-Length: " +
        length +
        "\r\n" +
        "\r\n" +
        message,
    );
  }
  socket.destroy();
}

/* eslint-disable */