Limit Network text view to 2^16 characters to prevent it from crashing

packages/devtools_app/lib/src/screens/network/network_request_inspector_views.dart

@@ -159,8 +159,8 @@ class HttpRequestView extends StatelessWidget {
         Widget child;
         child = isJson
             ? JsonViewer(encodedJson: data.requestBody!)
-            : Text(
-                data.requestBody!,
+            : TextViewer(
+                text: data.requestBody!,
                 style: theme.fixedFontStyle,
               );
         return Padding(
@@ -356,8 +356,8 @@ class HttpTextResponseViewer extends StatelessWidget {
 
         return switch (currentLocalResponseType) {
           NetworkResponseViewType.json => JsonViewer(encodedJson: responseBody),
-          NetworkResponseViewType.text => Text(
-              responseBody,
+          NetworkResponseViewType.text => TextViewer(
+              text: responseBody,
               style: textStyle,
             ),
           _ => const SizedBox(),

packages/devtools_app/lib/src/shared/common_widgets.dart

@@ -1264,6 +1264,38 @@ class JsonViewer extends StatefulWidget {
   State<JsonViewer> createState() => _JsonViewerState();
 }
 
+/// A wrapper for a Text widget, which allows for concatenating text if it
+/// becomes too long.
+class TextViewer extends StatelessWidget {
+  const TextViewer({
+    super.key,
+    required this.text,
+    this.maxLength = 65536, //2^16
+    this.style,
+  });
+
+  final String text;
+  // TODO: change the maxLength if we determine a more appropriate limit
+  // in https://github.com/flutter/devtools/issues/6263.
+  final int maxLength;
+  final TextStyle? style;
+
+  @override
+  Widget build(BuildContext context) {
+    final String displayText;
+    // Limit the length of the displayed text to maxLength
+    if (text.length > maxLength) {
+      displayText = '${text.substring(0, min(maxLength, text.length))}...';
+    } else {
+      displayText = text;
+    }
+    return Text(
+      displayText,
+      style: style,
+    );
+  }
+}
+
 class _JsonViewerState extends State<JsonViewer>
     with ProvidedControllerMixin<DebuggerController, JsonViewer> {
   late Future<void> _initializeTree;

packages/devtools_app/release_notes/NEXT_RELEASE_NOTES.md

@@ -24,7 +24,7 @@ TODO: Remove this section if there are not any general updates.
 TODO: Remove this section if there are not any general updates.
 
 ## Network profiler updates
-TODO: Remove this section if there are not any general updates.
+- Fixed a crash with large text in request or response - [#6254](https://github.com/flutter/devtools/pull/6254)
 
 ## Logging updates
 TODO: Remove this section if there are not any general updates.