1026759: added the troubleshooting section for react spreadsheet

Document-Processing/Excel/Spreadsheet/React/troubleshooting/http-413-entity-too-large.md

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+---
+layout: post
+title: HTTP 413 "Entity too large" in React Spreadsheet control | Syncfusion
+description: Resolve the HTTP 413 'Entity too large' error when exporting large Excel files from React Spreadsheet by increasing server request limits.
+platform: document-processing
+control: Spreadsheet
+documentation: ug
+---
+
+# Troubleshoot HTTP 413 "Entity too large" error
+
+Sometimes, when exporting the Spreadsheet with a large dataset, an `Entity too large` issue may occur. This is related to an HTTP request attempting to receive a large amount of data. To resolve this, configure your server to handle larger data transfers.
+
+## Solutions
+
+To resolve this, configure your local Web API back-end to accept larger request bodies. Add the following settings to increase the allowed request size:
+
+### Step 1: Update web.config (Server-side)
+
+Add or update the `requestLimits` configuration in your WebAPI's `web.config` file to increase the maximum allowed content length:
+
+```xml
+<configuration>
+  <system.webServer>
+    <security>
+      <requestFiltering>
+        <requestLimits maxAllowedContentLength="2147483647"></requestLimits>
+      </requestFiltering>
+    </security>
+    <directoryBrowse enabled="true" />
+  </system.webServer>
+</configuration>
+```
+
+### Step 2: Update Program.cs (Server-side)
+
+Configure the Form Options in your `Program.cs` to handle larger form submissions:
+
+```csharp
+builder.Services.Configure<FormOptions>(options =>
+{
+    options.ValueLengthLimit = int.MaxValue; // or set a custom larger value
+    options.KeyLengthLimit = int.MaxValue;
+    options.MultipartBodyLengthLimit = long.MaxValue;
+});
+```
+
+Additionally, we recommend setting the `isFullPost` property to `false` in the `beforeSave` event when exporting large Excel files. When `isFullPost` is `false`, to mitigate Spreadsheet can lead to performance issues such as timeouts or delays, particularly due to the size and complexity during export. See the `isFullPost` [documentation]((https://help.syncfusion.com/document-processing/excel/spreadsheet/react/performance-best-practices#handling-large-file-saves-with-isfullpost-option) ) for details.
+
+## See Also
+
+* [Performance Best Practices](../performance-best-practices)
+* [Open excel files](../open-excel-files.md)
+* [Save Excel files](../save-excel-files.md)
+* [Web Service](../web-services/webservice-overview.md)