HttpCapabilitiesBase.RequiresUniqueFilePathSuffix Property


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Gets a value indicating whether the browser requires unique form-action URLs.

Namespace:   System.Web.Configuration
Assembly:  System.Web (in System.Web.dll)

public virtual bool RequiresUniqueFilePathSuffix { get; }

Property Value

Type: System.Boolean

true if the browser requires unique form-action URLs; otherwise, false. The default is false.

A self-referring HTML <form> element is one for which the action attribute specifies its own URL. If true, self-referring forms do not return the correct results. This is due to caching by either the browser or an intermediate gateway. To correct this, server control adapters append a default query string (__ufps=uniquefilepathsuffix) onto the form-action URL values of self-referring forms.

The following code example shows how to determine whether the browser requires unique form-action URLs.

<%@ page language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<script runat="server">
    void Page_Load(Object Sender, EventArgs e)

    void CheckBrowserCaps()
        String labelText = "";
        System.Web.HttpBrowserCapabilities myBrowserCaps = Request.Browser;
        if (((System.Web.Configuration.HttpCapabilitiesBase)myBrowserCaps).RequiresUniqueFilePathSuffix)
            labelText = "Browser requires FORM ACTION URLs be unique.";
            labelText = "Browser does not require FORM ACTION URLs be unique.";

        Label1.Text = labelText;

<html xmlns="" >
    <title>Browser Capabilities Sample</title>
    <form runat="server" id="form1">
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />

.NET Framework
Available since 2.0
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