diff --git a/block.go b/block.go
index c8f4794..6191545 100644
--- a/block.go
+++ b/block.go
@@ -22,7 +22,7 @@ func agentBlock(next http.HandlerFunc) http.HandlerFunc {
 		} {
 			if strings.Contains(ua, bua) {
 				// log.Debug().Str("ua", ua).Msg("user-agent blocked")
-				http.Error(w, "Forbidden", http.StatusForbidden)
+				http.Error(w, "", http.StatusForbidden)
 				return
 			}
 		}
@@ -69,7 +69,7 @@ func ipBlock(next http.HandlerFunc) http.HandlerFunc {
 			for _, ipnet := range ranges {
 				if ipnet.Contains(ip) {
 					log.Debug().Stringer("ip", ip).Msg("ip blocked")
-					http.Error(w, "Forbidden", http.StatusForbidden)
+					http.Error(w, "", http.StatusForbidden)
 					return
 				}
 			}
diff --git a/http_middleware.go b/http_middleware.go
index e20cfba..e21f42a 100644
--- a/http_middleware.go
+++ b/http_middleware.go
@@ -43,7 +43,7 @@ func queueMiddleware(next http.HandlerFunc) http.HandlerFunc {
 		}
 
 		willQueue := false
-		for _, prefix := range []string{"/nevent1", "/image", "/naddr1", "/npub1", "/nprofile1", "/note1", "/embed"} {
+		for _, prefix := range []string{"/njump", "/nevent1", "/image", "/naddr1", "/npub1", "/nprofile1", "/note1", "/embed"} {
 			if strings.HasPrefix(r.URL.Path, prefix) {
 				willQueue = true
 				break
@@ -56,11 +56,19 @@ func queueMiddleware(next http.HandlerFunc) http.HandlerFunc {
 		}
 
 		qidx := stupidHash(r.URL.Path)
-		curr := concurrentRequests[qidx].Load()
-		isFirst := curr == 0
+		// add 1
+		count := concurrentRequests[qidx].Add(1)
+		isFirst := count == 1
+		if count > 2 {
+			log.Debug().Uint32("count", count).Int("qidx", qidx).Msg("too many concurrent requests")
 
-		// add 1 and lock (or wait for the lock)
-		concurrentRequests[qidx].Add(1)
+			if count > 4 {
+				http.Error(w, "", http.StatusTooManyRequests)
+				return
+			}
+		}
+
+		// lock (or wait for the lock)
 		queue[qidx].Lock()
 
 		if isFirst {