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最新的FiddlerCoreAPIFreeSetup，抓包新dll文件，安装后使用，Fiddler提供的http自定义拦截处理库，FiddlerCore目前作为.NET类库提供，可供任何.NET应用程序使用。FiddlerCore设计用于在没有用户界面（例如测试自动化）的情况下运行的专用应用程序，或者专门用于Fiddler Addon不适合的UI（例如WPF流量可视化）的UI。
FiddlerCore现在已经转为收费了，但在收费之前出过几个针对.net standard的新版本的测试版，这些版本是可以正常使用的，也没有30天的限制。完整的SDK和Demo都有。下载地址如下：
FiddlerCoreAPIFree_4_6_20191_7809.zip下载
超链接登录可见。
新建一个 .NET 4.6.2 的控制台项目：HttpCapture，引用 FiddlerCore45.dll 类库，可以通过如上下载获得。
Fiddler 事件如下：
//
// 摘要:
// This event fires when a session has been completed
public static event SessionStateHandler AfterSessionComplete;
//
// 摘要:
// This event fires when Fiddler captures a WebSocket message
public static event EventHandler<WebSocketMessageEventArgs> OnWebSocketMessage;
[CodeDescription("This event fires a HTTPS certificate is validated.")]
public static event EventHandler<ValidateServerCertificateEventArgs> OnValidateServerCertificate;
//
// 摘要:
// This event fires when Response Headers are available
public static event SessionStateHandler ResponseHeadersAvailable;
//
// 摘要:
// This event fires when Request Headers are available
public static event SessionStateHandler RequestHeadersAvailable;
//
// 摘要:
// This event fires when a server response is received by Fiddler
public static event SessionStateHandler BeforeResponse;
//
// 摘要:
// This event fires when a client request is received by Fiddler
public static event SessionStateHandler BeforeRequest;
//
// 摘要:
// This event fires each time FiddlerCore reads data from network for the client's
// request. Note that this data is not formatted in any way, and must be parsed
// by the recipient.
public static event EventHandler<RawReadEventArgs> OnReadRequestBuffer;
//
// 摘要:
// This event fires each time FiddlerCore reads data from network for the server's
// response. Note that this data is not formatted in any way, and must be parsed
// by the recipient.
public static event EventHandler<RawReadEventArgs> OnReadResponseBuffer;
[CodeDescription("This event fires when the user instructs Fiddler to clear the cache or cookies.")]
public static event EventHandler<CacheClearEventArgs> OnClearCache;
//
// 摘要:
// Sync this event to be notified when FiddlerCore has attached as the system proxy.")]
[CodeDescription("Sync this event to be notified when FiddlerCore has attached as the system proxy.")]
[Obsolete("Please, use the Telerik.NetworkConnections.NetworkConnectionsManager.")]
public static event SimpleEventHandler FiddlerAttach;
//
// 摘要:
// Sync this event to be notified when FiddlerCore has detached as the system proxy.
[CodeDescription("Sync this event to be notified when FiddlerCore has detached as the system proxy.")]
[Obsolete("Please, use the Telerik.NetworkConnections.NetworkConnectionsManager.")]
public static event SimpleEventHandler FiddlerDetach;
[CodeDescription("This event fires when a user notification would be shown. See CONFIG.QuietMode property.")]
public static event EventHandler<NotificationEventArgs> OnNotification;
//
// 摘要:
// This event fires when an error response is generated by Fiddler
public static event SessionStateHandler BeforeReturningError;
//
// 摘要:
// Fired each time Fiddler successfully accepts a TCP/IP connection
public static event EventHandler<ConnectionEventArgs> AfterSocketAccept;
//
// 摘要:
// Fired each time Fiddler successfully establishes a TCP/IP connection
public static event EventHandler<ConnectionEventArgs> AfterSocketConnect;
常用的就 BeforeRequest（请求之前）、BeforeResponse（响应之前）、AfterSessionComplete（请求会话完成） 事件。
如果想拦截 HTTPS 请求，需要安装证书，代码如下：
附上判断证书是否存在的代码：
我们实现的效果如下：
1.拦截 www.itsvse.com 站点请求，直接返回一段 json 内容。
2.拦截 down.itsvse.com 站点，在响应之后，替换字符串“上传者”为“Uploaded by（替换之后名称）”
代码如下：
然后手动设置 ie 代理 127.0.0.1:9099，也可以使用代码设置，如下：
效果图如下：
注意：在修改响应之后的内容的时候，需要在 BeforeRequest 事件设置会话 session.bBufferResponse = true; ，否则无法修改响应内容！
源码下载：
（完）
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发表于 2022-3-6 10:33:30