HttpModule 添加标头到请求

发布于 2024-09-30 08:57:10 字数 546 浏览 2 评论 0原文

这看起来是一个简单的操作。

我们需要在我们的开发环境（在 XP/IIS 5 上运行）中向到达我们应用程序的每个 HttpRequest 添加一些标头。（这是为了模拟我们在开发中没有的生产环境）。乍一看，这似乎是一个简单的 HttpModule，大致如下：

public class Dev_Sim: IHttpModule
{
    public void Init(HttpApplication app)
    {
        app.BeginRequest += delegate { app.Context.Request.Headers.Add("UserName", "XYZZY"); };
    }

    public void Dispose(){}
}

但在尝试这样做时，我发现 Request 的 Headers 集合是只读的，并且 Add 方法失败并出现 OperationNotSupported 异常。

我花了几个小时在谷歌上研究这个问题，对于这个应该是相对简单的问题，我没有找到简单的答案。

有人有任何指点吗？

原文

This seems like a simple operation.

We have a need in our development environment (running on XP/IIS 5) to add some headers into each HttpRequest arriving at our application. (This is to simulate a production environment that we don't have available in dev). At first blush, this seemed like a simple HttpModule, along the lines of:

public class Dev_Sim: IHttpModule
{
    public void Init(HttpApplication app)
    {
        app.BeginRequest += delegate { app.Context.Request.Headers.Add("UserName", "XYZZY"); };
    }

    public void Dispose(){}
}

But on trying to do that, I find that the Headers collection of the Request is read-only, and the Add method fails with an OperationNotSupported exception.

Spending a couple hours researching this on Google, I've come up with no easy answer to what should be a relatively straight-forward problem.

Does anyone have any pointers?

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︶￣淡然 2024-10-07 08:57:10

好的，在同事的帮助和一些实验的帮助下，我发现这可以通过通过反射访问的一些受保护的属性和方法的帮助来完成：

var headers = app.Context.Request.Headers;
Type hdr = headers.GetType();
PropertyInfo ro = hdr.GetProperty("IsReadOnly", 
    BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.IgnoreCase | BindingFlags.FlattenHierarchy);
// Remove the ReadOnly property
ro.SetValue(headers, false, null);
// Invoke the protected InvalidateCachedArrays method 
hdr.InvokeMember("InvalidateCachedArrays", 
    BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance, 
    null, headers, null);
// Now invoke the protected "BaseAdd" method of the base class to add the
// headers you need. The header content needs to be an ArrayList or the
// the web application will choke on it.
hdr.InvokeMember("BaseAdd", 
    BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance, 
    null, headers, 
    new object[] { "CustomHeaderKey", new ArrayList {"CustomHeaderContent"}} );
// repeat BaseAdd invocation for any other headers to be added
// Then set the collection back to ReadOnly
ro.SetValue(headers, true, null);

这至少对我有用。

Okay, with the assistance of a co-worker and some experimentation, I found that this can be done with the assistance of some protected properties and methods accessed through reflection:

var headers = app.Context.Request.Headers;
Type hdr = headers.GetType();
PropertyInfo ro = hdr.GetProperty("IsReadOnly", 
    BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.IgnoreCase | BindingFlags.FlattenHierarchy);
// Remove the ReadOnly property
ro.SetValue(headers, false, null);
// Invoke the protected InvalidateCachedArrays method 
hdr.InvokeMember("InvalidateCachedArrays", 
    BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance, 
    null, headers, null);
// Now invoke the protected "BaseAdd" method of the base class to add the
// headers you need. The header content needs to be an ArrayList or the
// the web application will choke on it.
hdr.InvokeMember("BaseAdd", 
    BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance, 
    null, headers, 
    new object[] { "CustomHeaderKey", new ArrayList {"CustomHeaderContent"}} );
// repeat BaseAdd invocation for any other headers to be added
// Then set the collection back to ReadOnly
ro.SetValue(headers, true, null);

This works for me, at least.

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不知所踪 2024-10-07 08:57:10

您可以通过这种方式添加到标题。这是一种在请求进入身份验证序列之前向请求添加凭据信息的方法。

string cred = "UN:PW";
System.Web.HttpContext.Current.Request.Headers.Add("Authorization", "Basic " +Convert.ToBase64String(Encoding.ASCII.GetBytes(cred)));

You can add to the Header this way. This is a way to add credential information to the request before it enter the authentication sequence.

string cred = "UN:PW";
System.Web.HttpContext.Current.Request.Headers.Add("Authorization", "Basic " +Convert.ToBase64String(Encoding.ASCII.GetBytes(cred)));

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