File Content: check-warning-header.js 'use strict' const LRU = require('lru-cache') const WARNING_REGEXP = /^\s*(\d{3})\s+(\S+)\s+"(.*)"\s+"([^"]+)"/ const BAD_HOSTS = new LRU({ max: 50 }) module.exports = checkWarnings function checkWarnings (res, registry, opts) { if (res.headers.has('warning') && !BAD_HOSTS.has(registry)) { const warnings = {} res.headers.raw()['warning'].forEach(w => { const match = w.match(WARNING_REGEXP) if (match) { warnings[match[1]] = { code: match[1], host: match[2], message: match[3], date: new Date(match[4]) } } }) BAD_HOSTS.set(registry, true) if (warnings['199']) { if (warnings['199'].message.match(/ENOTFOUND/)) { opts.log.warn('registry', `Using stale data from ${registry} because the host is inaccessible -- are you offline?`) } else { opts.log.warn('registry', `Unexpected warning for ${registry}: ${warnings['199'].message}`) } } if (warnings['111']) { // 111 Revalidation failed -- we're using stale data opts.log.warn( 'registry', `Using stale package data from ${registry} due to a request error during revalidation.` ) } } } Submit