From 5c8bea3cc0c74238703f42e68ebd7f65545059d2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mike=20F=C3=A4hrmann?= <mike_faehrmann@web.de>
Date: Mon, 2 Feb 2026 10:48:56 +0100
Subject: [PATCH] [8chan] fail downloads of 'POW' images (#8975)

---
 gallery_dl/extractor/8chan.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gallery_dl/extractor/8chan.py b/gallery_dl/extractor/8chan.py
index d0d64dc8..1f477c60 100644
--- a/gallery_dl/extractor/8chan.py
+++ b/gallery_dl/extractor/8chan.py
@@ -107,6 +107,7 @@ class _8chanThreadExtractor(_8chanExtractor):
             for num, file in enumerate(files):
                 file.update(thread)
                 file["num"] = num
+                file["_http_validate"] = _validate
                 text.nameext_from_url(file["originalName"], file)
                 yield Message.Url, self.root + file["path"], file
 
@@ -137,3 +138,12 @@ class _8chanBoardExtractor(_8chanExtractor):
                 return
             url = f"{self.root}/{board}/{pnum}.json"
             threads = self.request_json(url)["threads"]
+
+
+def _validate(response):
+    hget = response.headers.get
+    return not (
+        hget("expires") == "0" and
+        hget("content-length") == "166" and
+        hget("content-type") == "image/png"
+    )