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1const LOOPBACK_HOSTNAMES = new Set(['localhost']);2 3const isIPv4Loopback = (host) => {4  const parts = host.split('.');5  if (parts.length !== 4) return false;6  if (parts[0] !== '127') return false;7  return parts.every((p) => /^\d+$/.test(p) && Number(p) >= 0 && Number(p) <= 255);8};9 10const isIPv6Loopback = (host) => {11  // Collapse all-zero groups: any form of ::1 / 0:0:...:0:112  // First, strip any leading "::" by normalising with Set lookup of common forms,13  // then fall back to structural check.14  if (host === '::1') return true;15 16  // Check IPv4-mapped IPv6 loopback: ::ffff:<v4-loopback> or ::ffff:<hex-v4-loopback>17  // Node's URL parser normalises ::ffff:127.0.0.1 → ::ffff:7f00:118  const v4MappedDotted = host.match(/^::ffff:(\d+\.\d+\.\d+\.\d+)$/i);19  if (v4MappedDotted) return isIPv4Loopback(v4MappedDotted[1]);20 21  const v4MappedHex = host.match(/^::ffff:([0-9a-f]{1,4}):([0-9a-f]{1,4})$/i);22  if (v4MappedHex) {23    const high = parseInt(v4MappedHex[1], 16);24    // High 16 bits must start with 127 (0x7f) — i.e. 0x7f00..0x7fff25    return high >= 0x7f00 && high <= 0x7fff;26  }27 28  // Full-form ::1 variants: any number of zero groups followed by trailing 129  // e.g. 0:0:0:0:0:0:0:1, 0000:...:000130  const groups = host.split(':');31  if (groups.length === 8) {32    for (let i = 0; i < 7; i++) {33      if (!/^0+$/.test(groups[i])) return false;34    }35    return /^0*1$/.test(groups[7]);36  }37 38  return false;39};40 41const isLoopback = (host) => {42  if (!host) return false;43  if (LOOPBACK_HOSTNAMES.has(host)) return true;44  if (isIPv4Loopback(host)) return true;45  return isIPv6Loopback(host);46};47 48const DEFAULT_PORTS = {49  http: 80,50  https: 443,51  ws: 80,52  wss: 443,53  ftp: 21,54};55 56const parseNoProxyEntry = (entry) => {57  let entryHost = entry;58  let entryPort = 0;59 60  if (entryHost.charAt(0) === '[') {61    const bracketIndex = entryHost.indexOf(']');62 63    if (bracketIndex !== -1) {64      const host = entryHost.slice(1, bracketIndex);65      const rest = entryHost.slice(bracketIndex + 1);66 67      if (rest.charAt(0) === ':' && /^\d+$/.test(rest.slice(1))) {68        entryPort = Number.parseInt(rest.slice(1), 10);69      }70 71      return [host, entryPort];72    }73  }74 75  const firstColon = entryHost.indexOf(':');76  const lastColon = entryHost.lastIndexOf(':');77 78  if (79    firstColon !== -1 &&80    firstColon === lastColon &&81    /^\d+$/.test(entryHost.slice(lastColon + 1))82  ) {83    entryPort = Number.parseInt(entryHost.slice(lastColon + 1), 10);84    entryHost = entryHost.slice(0, lastColon);85  }86 87  return [entryHost, entryPort];88};89 90const normalizeNoProxyHost = (hostname) => {91  if (!hostname) {92    return hostname;93  }94 95  if (hostname.charAt(0) === '[' && hostname.charAt(hostname.length - 1) === ']') {96    hostname = hostname.slice(1, -1);97  }98 99  return hostname.replace(/\.+$/, '');100};101 102export default function shouldBypassProxy(location) {103  let parsed;104 105  try {106    parsed = new URL(location);107  } catch (_err) {108    return false;109  }110 111  const noProxy = (process.env.no_proxy || process.env.NO_PROXY || '').toLowerCase();112 113  if (!noProxy) {114    return false;115  }116 117  if (noProxy === '*') {118    return true;119  }120 121  const port =122    Number.parseInt(parsed.port, 10) || DEFAULT_PORTS[parsed.protocol.split(':', 1)[0]] || 0;123 124  const hostname = normalizeNoProxyHost(parsed.hostname.toLowerCase());125 126  return noProxy.split(/[\s,]+/).some((entry) => {127    if (!entry) {128      return false;129    }130 131    let [entryHost, entryPort] = parseNoProxyEntry(entry);132 133    entryHost = normalizeNoProxyHost(entryHost);134 135    if (!entryHost) {136      return false;137    }138 139    if (entryPort && entryPort !== port) {140      return false;141    }142 143    if (entryHost.charAt(0) === '*') {144      entryHost = entryHost.slice(1);145    }146 147    if (entryHost.charAt(0) === '.') {148      return hostname.endsWith(entryHost);149    }150 151    return hostname === entryHost || (isLoopback(hostname) && isLoopback(entryHost));152  });153}154