diff --git a/library/components/poster/PosterWall.vue b/library/components/poster/PosterWall.vue
index 8bf843e3b..2cb22b51c 100644
--- a/library/components/poster/PosterWall.vue
+++ b/library/components/poster/PosterWall.vue
@@ -46,6 +46,7 @@ import { tStatic } from '../../i18n/index.js'
 // custom elements that install no i18n plugin, and an unguarded useI18n() throws on the way in.
 const T = (key, en) => tStatic(key) || en
 import { useShadowStyles } from '@map/composables/useShadowStyles.js'
+import { fetchPosterRaster, fetchPosterSource } from '@map/packet/poster-fetch.js'
 import { usePosterPrints } from '@map/composables/usePosterPrints.js'
 import { useOptionalI18n, useOptionalT } from '@map/composables/useOptionalT.js'
 // Export-modal geometry. A fixed;inset:0 scrim covers only the CONTENT PANE in the cap-5 shell
@@ -387,10 +388,10 @@ async function exportPoster(item) {
     // which aborts every .webp at the network layer to force the default-drop
     // condition, went from PASS on the old wall to FAIL here with 0 .html requests.
     // The wall this component was extracted from already guarded it; the extraction
-    // did not carry the guard across.
-    let res = null
-    try { res = await fetch(`${base.value}/posters/${item.id}.webp`) } catch { /* treated as a miss */ }
-    if (!res || !res.ok) {
+    // did not carry the guard across. The guard now lives in poster-fetch.js, which also
+    // takes a host's 200 fallback page (text/html for a missing .webp) as a miss.
+    const raster = await fetchPosterRaster(`${base.value}/posters/${item.id}.webp`)
+    if (!raster) {
       // ★ NO PRE-RENDERED IMAGE? GENERATE IT. The 378 .webp posters were 41 MB in
       // every clone, shipped to every reader whether or not they opened one — and a
       // publish was already rejected once at a 74 MB asset tree. The poster HTML is
@@ -400,10 +401,10 @@ async function exportPoster(item) {
       // ship nothing. A 404 used to end here as "poster not found".
       exportState.value = { ...exportState.value, phase: 'render',
         message: 'generating the poster', pct: 45 }
-      const htmlRes = await fetch(`${base.value}/posters/${item.id}.html`)
-      if (!htmlRes.ok) throw new Error(`poster not found (${htmlRes.status})`)
+      const source = await fetchPosterSource(`${base.value}/posters/${item.id}.html`)
+      if (!source.html) throw new Error(`poster not found (${source.status})`)
       const { rasterPoster, looksRendered } = await import('@map/packet/poster-raster.js')
-      const blob = await rasterPoster(await htmlRes.text(), { scale: 2 })
+      const blob = await rasterPoster(source.html, { scale: 2 })
       // Fail LOUDLY rather than hand over a black rectangle: an SVG in an <img> is
       // an isolated document, so a missing stylesheet makes every fill fall back to
       // black with no error at all.
@@ -411,7 +412,7 @@ async function exportPoster(item) {
       await deliverPoster(blob, item)
       return
     }
-    await deliverPoster(await res.blob(), item)
+    await deliverPoster(raster, item)
   } catch (e) {
     exportState.value = { label: item.label, kind: 'Poster', phase: 'error',
       message: String(e?.message || e).slice(0, 140), pct: 0 }