Reproduction: open the new profile header (4.6.17) for any streamer
with a real Twitch avatar. The fallback gradient letter tile renders
instead of the actual profile picture. Image works fine pasted into
the browser; only the renderer img tag fails.
Cause is Electron renderer image loading against the Twitch CDN
(static-cdn.jtvnw.net) — undocumented but reproducible: the same
HTTPS URL that loads fine in DevTools fails silently from the live
page, firing the img.onerror handler which (by design) swaps to the
letter-tile fallback.
Fix: fetch the avatar bytes in the main process via axios (Node http
client, no renderer / CSP / referrer-policy / CORS shenanigans),
convert to base64 data URL, and put THAT in the profile.avatarUrl
field. The renderer just renders the data URL via img src — same
code path, but the URL is now data:image/png;base64,... so no
external fetch is involved.
Bytes cached by source URL in a small FIFO map (256 entries) so the
same avatar across cache misses only downloads once. Profile cache
itself is unchanged, just stores the data URL now instead of the
remote URL. On a clean restart the user sees the fix on first
streamer click; mid-session a click on Refresh (top-right of the
header) forces a re-fetch through the new path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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