From 0f1c403d41f957fc200401affc6e25928a81f09c Mon Sep 17 00:00:00 2001
From: KarnerF <johanneskrug@gmx.net>
Date: Sun, 30 Aug 2026 15:18:17 +0200
Subject: [PATCH] Cache-bust icon img src with timestamp; no-store on 404 to
 prevent browser caching misses

---
 main.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/main.c b/main.c
index bb426bb..6b2cd32 100644
--- a/main.c
+++ b/main.c
@@ -1797,10 +1797,10 @@ static void fn(struct mg_connection *c, int ev, void *ev_data) {
           "var ba=img.mounted"
           "?'<button type=\"button\" data-i=\"'+i+'\" onclick=\"_smUnmountThis(this)\" style=\"background:transparent;border:1px solid #f87171;border-radius:4px;color:#f87171;padding:3px 10px;cursor:pointer;font-size:.75rem;\">Unmount</button>'"
           ":'<button type=\"button\" data-i=\"'+i+'\" onclick=\"_smMountThis(this)\" style=\"background:transparent;border:1px solid var(--accent);border-radius:4px;color:var(--accent);padding:3px 10px;cursor:pointer;font-size:.75rem;white-space:nowrap;\">Mount</button>';"
-          /* /api/icon/{tid} has no query string - safe in img src */
+          /* add timestamp to img src to bypass any browser 404 cache */
           "var ic=tid"
           "?'<div style=\"position:relative;width:48px;height:48px;border-radius:8px;overflow:hidden;background:#1e2a42;flex-shrink:0;\">'"
-          "+'<img src=\"/api/icon/'+tid+'\" style=\"position:absolute;top:0;left:0;width:100%%;height:100%%;object-fit:cover;\" onerror=\"this.remove()\">'"
+          "+'<img src=\"/api/icon/'+tid+'?t='+Date.now()+'\" style=\"position:absolute;top:0;left:0;width:100%%;height:100%%;object-fit:cover;\" onerror=\"this.remove()\">'"
           "+'<span style=\"position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:.55rem;color:#64748b;font-family:monospace;\">'+tid.substring(0,4)+'</span></div>'"
           ":'<div style=\"width:48px;height:48px;border-radius:8px;background:#1e2a42;flex-shrink:0;\"></div>';"
           "h+='<div style=\"display:flex;align-items:center;gap:10px;padding:8px 4px;border-bottom:1px solid var(--border);\">'+ic;"
@@ -2976,11 +2976,11 @@ static void fn(struct mg_connection *c, int ev, void *ev_data) {
                     }free(ibuf);
                 }fclose(sf);
             }
-            mg_http_reply(c,404,"","");return;
+            mg_http_reply(c,404,"Cache-Control: no-store\r\n","");return;
             #undef SMG_IC2
         }
         fseek(fi,0,SEEK_END);long sz2=ftell(fi);fseek(fi,0,SEEK_SET);
-        if(sz2<=0||sz2>524288){fclose(fi);mg_http_reply(c,404,"","");return;}
+        if(sz2<=0||sz2>524288){fclose(fi);mg_http_reply(c,404,"Cache-Control: no-store\r\n","");return;}
         char *buf2=malloc(sz2);if(!buf2){fclose(fi);mg_http_reply(c,500,"","");return;}
         fread(buf2,1,sz2,fi);fclose(fi);
         mg_http_reply(c,200,"Content-Type: image/png\r\nCache-Control: max-age=86400\r\n","%.*s",(int)sz2,buf2);