Update POST.md

docs/en/Blog-Posts/2023-06-05 v7_3_Preview/POST.md

@@ -49,6 +49,7 @@ In this section, I will introduce some major features released in this version.
 * ABP CLI: switch-to-local command
 * Monitoring Distributed Events
 * Ordering of the Local Event Handlers
+* Nonce attribute support for Content Security Policy (CSP)
 * Other News
 
 ### Introducing the Volo.Abp.Imaging packages
@@ -117,6 +118,22 @@ By default, all event handlers have an order value of 0. Thus, if you want to ta
 
 > See the documentation to learn more: [https://docs.abp.io/en/abp/7.3/Local-Event-Bus](https://docs.abp.io/en/abp/7.3/Local-Event-Bus)
 
+### Nonce attribute support for Content Security Policy (CSP)
+
+ABP Framework supports adding unique value to nonce attribute for script tags which can be used by Content Security Policy to determine whether or not a given fetch will be allowed to proceed for a given element. In other words, it provides a mechanism to execute only correct script tags with the correct nonce value.
+
+This feature is disabled by default. You can enable it by setting the *UseContentSecurityPolicyScriptNonce* property of the `AbpSecurityHeadersOptions` class to **true**:
+
+```csharp
+Configure<AbpSecurityHeadersOptions>(options => 
+{
+    //adding script-src nonce
+    options.UseContentSecurityPolicyScriptNonce = true; //false by default
+});
+```
+
+> See the [Security Headers](https://docs.abp.io/en/abp/7.3/UI/AspNetCore/Security-Headers) documentation for more information.
+
 ### Other News
 
 * Upgraded the [Blazorise](https://blazorise.com/) library to v1.2.3 for Blazor UI. After the upgrade, ensure that all Blazorise-related packages are using v1.2.3 in your application.