Add pages configuration header document (github#26163)

Co-authored-by: github-actions <[email protected]>
Co-authored-by: Vanessa <[email protected]>
Co-authored-by: Laura Coursen <[email protected]>

Author: 4 people

assets/images/enterprise/management-console/pages-override-header-section.png

@@ -45,7 +45,7 @@ If subdomain isolation is disabled for your enterprise, you should also disable
 {% data reusables.enterprise_site_admin_settings.access-settings %}
 {% data reusables.enterprise_site_admin_settings.management-console %}
 {% data reusables.enterprise_management_console.pages-tab %}
-4. Unselect **Enable Pages**.
+1. Unselect **Enable Pages**.
   ![Checkbox to disable {% data variables.product.prodname_pages %}](/assets/images/enterprise/management-console/pages-select-button.png)
 {% data reusables.enterprise_management_console.save-settings %}
 
@@ -56,12 +56,35 @@ If subdomain isolation is disabled for your enterprise, you should also disable
 {% data reusables.enterprise-accounts.access-enterprise %}
 {% data reusables.enterprise-accounts.policies-tab %}
 {% data reusables.enterprise-accounts.pages-tab %}
-5. Under "Pages policies", deselect **Enable {% data variables.product.prodname_pages %}**.
+1. Under "Pages policies", deselect **Enable {% data variables.product.prodname_pages %}**.
   ![Checkbox to disable {% data variables.product.prodname_pages %}](/assets/images/enterprise/business-accounts/enable-github-pages-checkbox.png)
 {% data reusables.enterprise-accounts.pages-policies-save %}
 
 {% endif %}
 
+{% ifversion ghes > 3.4 %}
+
+## Configuring {% data variables.product.prodname_pages %} response headers for your enterprise
+
+You can add or override response headers for {% data variables.product.prodname_pages %} sites hosted by {% data variables.product.product_location %}.
+
+{% warning %}
+
+**Warning:** Ensure that your response headers are properly configured before saving. Improper configurations may negatively impact the security of {% data variables.product.product_location %}.
+
+{% endwarning %}
+
+{% data reusables.enterprise_site_admin_settings.access-settings %}
+{% data reusables.enterprise_site_admin_settings.management-console %}
+{% data reusables.enterprise_management_console.pages-tab %}
+1. Type the headers settings, then click **Add headers**.
+   - In the **Http Header Name** field, type the header name. The length of header name should less than 128 characters.
+   - In the **Http Header Value** field, type the header value. The length of header value should less than 300 characters.
+![The {% data variables.product.prodname_pages %} response header name and value fields in the {% data variables.enterprise.management_console %}](/assets/images/enterprise/management-console/pages-override-header-section.png)
+{% data reusables.enterprise_management_console.save-settings %}
+
+{% endif %}
+
 {% ifversion ghes %}
 ## Further reading