Javascript JS/AJAX加载资源失败服务器响应状态为404（未找到）

在这里，我试图让用户选择主页，而用户点击任何网页上的lnkfavourite按钮的网站。当我将其他页面设置为主页时，它会按预期工作，但不会使用default.aspx。此页面位于根目录下。
VB页面后面：

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 lnkFavorite.Attributes("onclick") = "clearFave();"
end sub

Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
    Try
        Dim u As String = "default.aspx"
        If Request("u") IsNot Nothing Then
            u = Request("u").Replace("|", "&")
        End If
        Profile.SetPropertyValue("favorite", u)
        Profile.Save()
    Catch ex As Exception

End Sub

JS/AJAX：

 function clearFave() {
    if (window.XMLHttpRequest) {
    req = new XMLHttpRequest();
    var params = "u=default.aspx";
    req.open("POST", "/myaccount/favorite.aspx", true);
    req.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    //req.setRequestHeader("Content-length", params.length);
    //req.setRequestHeader("Connection", "close");
    req.send(params);     //Error here

    var img = document.getElementById("ctl00_pageContent_imgFavorite");
    if (img) {
        img.src = img.src.replace("/favorite.png", "/unfavorite.png");
    }
    alert("This page is now set as your BERT home.");
  }
}

后面的收藏夹页面：

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 lnkFavorite.Attributes("onclick") = "clearFave();"
end sub

Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
    Try
        Dim u As String = "default.aspx"
        If Request("u") IsNot Nothing Then
            u = Request("u").Replace("|", "&")
        End If
        Profile.SetPropertyValue("favorite", u)
        Profile.Save()
    Catch ex As Exception

End Sub

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尝试更改帖子URL，使URL特定。像这样

http://doman:port/a-第页

req.open('POST', 'http://yourdomain:port//myaccount/favorite.aspx')

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我从post-url中删除了“/”，它成功了 发件人：

 req.open("POST", "/myaccount/favorite.aspx", true);

致：

 req.open("POST", "myaccount/favorite.aspx", true);

---

：）

@Zoe，同样的问题！