checking external links seems not practical

diff --git a/doc/ikiwiki/directive/brokenlinks/discussion.mdwn b/doc/ikiwiki/directive/brokenlinks/discussion.mdwn
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 Would it be possible to have such a thing also checking for external links? -- [[user/emptty]]
+
+> I guess this is not very practical.  For internal wiki links, we only need to check if the linked source file exist or not.  But for external links, we have to ping every links, which will slow down the build process a lot.  --[[weakish]]