Method sendError

packages/cli/src/util/dev/server.ts:1350–1414

(
    req: http.IncomingMessage,
    res: http.ServerResponse,
    requestId: string,
    errorCode?: string,
    statusCode: number = 500,
    headers: HttpHeadersConfig = {}
  )

  }

  async sendError(
    req: http.IncomingMessage,
    res: http.ServerResponse,
    requestId: string,
    errorCode?: string,
    statusCode: number = 500,
    headers: HttpHeadersConfig = {}
  ): Promise<void> {
    res.statusCode = statusCode;
    this.setResponseHeaders(res, requestId, headers);

    const http_status_description = generateHttpStatusDescription(statusCode);
    const error_code = errorCode || http_status_description;
    const errorMessage = generateErrorMessage(statusCode, error_code);

    let body: string;
    const { accept = 'text/plain' } = req.headers;
    if (accept.includes('json')) {
      res.setHeader('content-type', 'application/json');
      const json = JSON.stringify({
        error: {
          code: statusCode,
          message: errorMessage.title,
        },
      });
      body = `${json}\n`;
    } else if (accept.includes('html')) {
      res.setHeader('content-type', 'text/html; charset=utf-8');

      let view: string;
      if (statusCode === 404) {
        view = errorTemplate404({
          ...errorMessage,
          http_status_code: statusCode,
          http_status_description,
          error_code,
          request_id: requestId,
        });
      } else if (statusCode === 502) {
        view = errorTemplate502({
          ...errorMessage,
          http_status_code: statusCode,
          http_status_description,
          error_code,
          request_id: requestId,
        });
      } else {
        view = errorTemplate({
          http_status_code: statusCode,
          http_status_description,
          error_code,
          request_id: requestId,
        });
      }
      body = errorTemplateBase({
        http_status_code: statusCode,
        http_status_description,
        view,