服务器之间的区别是什么。转移和响应。重定向?

它们各自的优点和缺点是什么? 什么时候一种比另一种更合适? 什么时候不合适?


当前回答

响应。重定向:告诉浏览器可以在新的位置找到所请求的页面。然后,浏览器向新页面发起另一个请求,在浏览器中加载其内容。这将导致浏览器产生两个请求。

服务器。转移:它将执行从服务器上的第一个页面转移到第二个页面。就浏览器客户端而言,它只发出一个请求,初始页面就是响应内容的页面。 这种方法的好处是减少了一次从客户机浏览器到服务器的往返。此外,任何提交的表单变量和查询字符串参数也可用于第二个页面。

其他回答

更多关于Transfer()的细节,它实际上是Server.Execute() + Response.End(),它的源代码如下(来自Mono/.net 4.0):

public void Transfer (string path, bool preserveForm)
{
    this.Execute (path, null, preserveForm, true);
    this.context.Response.End ();
}

对于Execute(),它要运行的是给定路径的处理程序,参见

ASP.NET does not verify that the current user is authorized to view the resource delivered by the Execute method. Although the ASP.NET authorization and authentication logic runs before the original resource handler is called, ASP.NET directly calls the handler indicated by the Execute method and does not rerun authentication and authorization logic for the new resource. If your application's security policy requires clients to have appropriate authorization to access the resource, the application should force reauthorization or provide a custom access-control mechanism. You can force reauthorization by using the Redirect method instead of the Execute method. Redirect performs a client-side redirect in which the browser requests the new resource. Because this redirect is a new request entering the system, it is subjected to all the authentication and authorization logic of both Internet Information Services (IIS) and ASP.NET security policy. -from MSDN

简而言之:回应。重定向只是告诉浏览器访问另一个页面。服务器。Transfer有助于减少服务器请求,保持URL相同,并且通过一些错误处理,允许您传输查询字符串和表单变量。

我发现并同意以下观点:

Server.Transfer is similar in that it sends the user to another page with a statement such as Server.Transfer("WebForm2.aspx"). However, the statement has a number of distinct advantages and disadvantages. Firstly, transferring to another page using Server.Transfer conserves server resources. Instead of telling the browser to redirect, it simply changes the "focus" on the Web server and transfers the request. This means you don't get quite as many HTTP requests coming through, which therefore eases the pressure on your Web server and makes your applications run faster. But watch out: because the "transfer" process can work on only those sites running on the server; you can't use Server.Transfer to send the user to an external site. Only Response.Redirect can do that. Secondly, Server.Transfer maintains the original URL in the browser. This can really help streamline data entry techniques, although it may make for confusion when debugging. That's not all: The Server.Transfer method also has a second parameter—"preserveForm". If you set this to True, using a statement such as Server.Transfer("WebForm2.aspx", True), the existing query string and any form variables will still be available to the page you are transferring to. For example, if your WebForm1.aspx has a TextBox control called TextBox1 and you transferred to WebForm2.aspx with the preserveForm parameter set to True, you'd be able to retrieve the value of the original page TextBox control by referencing Request.Form("TextBox1").

”反应。重定向"和"服务器。“转移”有助于在页面执行时将用户从一个页面转移到另一个页面。但是他们进行这种转移/重定向的方式非常不同。

如果你是视觉爱好者,想看演示而不是理论,我建议你看看下面的facebook视频,它以更直观的方式解释了差异。

https://www.facebook.com/photo.php?v=762186150488997

他们之间的主要区别是谁来转账。在“响应。重定向“传输是由浏览器在服务器中完成的”。“传输”是由服务器完成的。让我们试着以更详细的方式来理解这句话。

在“服务器。转让”以下是转让发生的顺序:-

1.用户向ASP发送请求。网络页面。在下图中,请求被发送到“WebForm1”,我们希望导航到“Webform2”。

2.服务器开始执行“Webform1”,页面的生命周期开始。但是在页面的整个生命周期完成之前。transfer”恰好是“WebForm2”。

3.创建“Webform2”页面对象,执行整个页面生命周期,然后将输出HTML响应发送到浏览器。

在“回应”中。“重定向”下面是导航事件的顺序:-

1.客户端(浏览器)向页面发送请求。在下图中,请求被发送到“WebForm1”,我们希望导航到“Webform2”。

2.“Webform1”的生命周期开始执行。但在生命周期之间。重定向”发生。

3.现在,他向浏览器发送HTTP 302命令,而不是服务器执行重定向。该命令告诉浏览器必须向“Webform2”发起GET请求。aspx页面”。

4.浏览器解释302命令并为“Webform2.aspx”发送一个GET请求。

换句话说就是“服务器”。服务器在响应时执行“传输”。“重定向”由浏览器执行。”反应。重定向”需要两个请求来做页面的重定向。

所以什么时候使用“服务器”。转移”以及何时使用“响应”。重定向”?

使用“服务器。当您想导航位于同一服务器上的页面时,请使用“响应”。重定向"当你想在不同服务器和域上的页面之间导航时。

下面是一个汇总表,其中列出了不同之处以及在哪个场景中使用。

Response.Redirect Response.Redirect() will send you to a new page, update the address bar and add it to the Browser History. On your browser you can click back. It redirects the request to some plain HTML pages on our server or to some other web server. It causes additional roundtrips to the server on each request. It doesn’t preserve Query String and Form Variables from the original request. It enables to see the new redirected URL where it is redirected in the browser (and be able to bookmark it if it’s necessary). Response. Redirect simply sends a message down to the (HTTP 302) browser.

Server.Transfer Server.Transfer() does not change the address bar, we cannot hit back.One should use Server.Transfer() when he/she doesn’t want the user to see where he is going. Sometime on a "loading" type page. It transfers current page request to another .aspx page on the same server. It preserves server resources and avoids the unnecessary roundtrips to the server. It preserves Query String and Form Variables (optionally). It doesn’t show the real URL where it redirects the request in the users Web Browser. Server.Transfer happens without the browser knowing anything, the browser request a page, but the server returns the content of another.

Response.Redirect()应该在以下情况下使用:

我们希望将请求重定向到我们服务器上的一些普通HTML页面或其他web服务器 我们不关心在每个请求上引起到服务器的额外往返 我们不需要保留原始请求中的查询字符串和表单变量 我们希望我们的用户能够看到新的重定向URL,他在他的浏览器重定向(并能够收藏它,如果它的必要)

Server.Transfer()应该在以下情况下使用:

我们希望将当前页面请求传输到同一服务器上的另一个.aspx页面 我们希望保留服务器资源并避免到服务器的不必要的往返 我们想保留查询字符串和表单变量(可选) 我们不需要在用户的Web浏览器中显示我们重定向请求的真实URL