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17  }
18
19  // single-post regex handles www, old, api, or naked reddit.com
20  if (/^https?:\/\/(?:[^/]+\.)?reddit\.com\/.*\/comments\/[a-z0-9]+/i.test(feedUrl)) {
21    try {
65  const pathname = new URL(postUrl).pathname.replace(/\/$/, "");
66  const headers = {
67    // UA beginning with “Reddit/” is whitelisted for api.reddit.com JSON
68    "User-Agent": "Reddit/20230522 (Android 14; Pixel 8 Pro)",
69    "Accept": "application/json",
70  };
71
72  // 1️⃣ try api.reddit.com (no Cloudflare)
73  let txt = await fetch(`https://api.reddit.com${pathname}?limit=${limit}&raw_json=1`, { headers })
74    .then(r => r.text());
75  if (txt.trim().startsWith("<")) { // got HTML ➜ fallback
79    }).then(r => r.text());
80    if (txt.trim().startsWith("<"))
81      throw new Error("Both api.reddit.com and old.reddit.com returned HTML (likely blocked)");
82  }
83