Fix WebView error handling to enable mp3 attachments loading

Author: testableapple

CHANGELOG.md

@@ -3,7 +3,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 # Upcoming
 
-### 🔄 Changed
+### 🐞 Fixed
+- Fix WebView error handling to enable mp3 attachments loading [#904](https://github.com/GetStream/stream-chat-swiftui/pull/904)
 
 # [4.83.0](https://github.com/GetStream/stream-chat-swiftui/releases/tag/4.83.0)
 _July 29, 2025_

Sources/StreamChatSwiftUI/ChatChannel/MessageList/WebView.swift

@@ -71,6 +71,12 @@ struct WebView: UIViewRepresentable {
             didFailProvisionalNavigation navigation: WKNavigation!,
             withError error: Error
         ) {
+            // Ignore "Plug-in handled load" error as it's actually success for audio files
+            let nsError = error as NSError
+            if nsError.domain == "WebKitErrorDomain" && nsError.code == 204 {
+                return
+            }
+
             isLoading.wrappedValue = false
             self.error.wrappedValue = error
         }
@@ -80,6 +86,12 @@ struct WebView: UIViewRepresentable {
             didFail navigation: WKNavigation!,
             withError error: Error
         ) {
+            // Ignore "Plug-in handled load" error as it's actually success for audio files
+            let nsError = error as NSError
+            if nsError.domain == "WebKitErrorDomain" && nsError.code == 204 {
+                return
+            }
+
             isLoading.wrappedValue = false
             self.error.wrappedValue = error
         }