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// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.// Copyright Joyent and Node contributors. All rights reserved. MIT license.
import { setUnrefTimeout } from "../timers.ts";import { notImplemented } from "../_utils.ts";
let utcCache: string | undefined;
export function utcDate() {  if (!utcCache) cache();  return utcCache;}
function cache() {  const d = new Date();  utcCache = d.toUTCString();  setUnrefTimeout(resetCache, 1000 - d.getMilliseconds());}
function resetCache() {  utcCache = undefined;}
export function emitStatistics(  _statistics: { startTime: [number, number] } | null,) {  notImplemented("internal/http.emitStatistics");}
export const kOutHeaders = Symbol("kOutHeaders");export const kNeedDrain = Symbol("kNeedDrain");
export default {  utcDate,  emitStatistics,  kOutHeaders,  kNeedDrain,};