From: Eric Wong <e@80x24.org>
Date: Fri, 24 Sep 2021 10:56:45 +0000 (+0000)
Subject: fetch: support v2 w/o manifest on old WWW
X-Git-Tag: v1.7.0~282
X-Git-Url: http://www.git.stargrave.org/?a=commitdiff_plain;h=77b3dac08f58503e374e98c29b9e0ee7c866c0e5;hp=77b3dac08f58503e374e98c29b9e0ee7c866c0e5;p=public-inbox.git

fetch: support v2 w/o manifest on old WWW

There may still be pre-manifest.js.gz versions of
PublicInbox::WWW running and serving v2 inboxes.

While -clone and "add-external --mirror" were working, -fetch
was failing due to 301 redirect to $INBOX_URL/manifest.js.gz/
and not the expected 404.  Update the code to deal with a JSON
decode error (from the 301) and ensure v2 epochs detection is
correct (and not using a shadowed variable).
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