IIS自带的http modules分别注册了HttpApplication pipeline里面的哪些事件

 每个module的作用不同，会分别注册到所需要处理的事件。

事件本身的处理顺序是由pipeline决定的，如果多个module注册了同一个事件，触发的顺序按照注册事件的先后顺序来。注册的顺序，是由module的配置决定的。

C:WindowsSystem32inetsrvconfigapplicationHost.config

<modules>
            <add name="IsapiModule" lockItem="true" />
                <add name="BasicAuthenticationModule" lockItem="true" />
            <add name="HttpLoggingModule" lockItem="true" />
            <add name="HttpCacheModule" lockItem="true" />
            <add name="StaticCompressionModule" lockItem="true" />
            <add name="DefaultDocumentModule" lockItem="true" />
            <add name="DirectoryListingModule" lockItem="true" />
            <add name="IsapiFilterModule" lockItem="true" />
            <add name="ProtocolSupportModule" lockItem="true" />
            <add name="StaticFileModule" lockItem="true" />
            <add name="AnonymousAuthenticationModule" lockItem="true" />
            <add name="RequestFilteringModule" lockItem="true" />
            <add name="CustomErrorModule" lockItem="true" />
                <add name="WindowsAuthenticationModule" lockItem="true" />
                <add name="FailedRequestsTracingModule" lockItem="true" />
                <add name="UrlAuthorizationModule" lockItem="true" />
                <add name="HttpRedirectionModule" lockItem="true" />
                <add name="ServerSideIncludeModule" lockItem="true" />
                <add name="CertificateMappingAuthenticationModule" lockItem="true" />
                <add name="DigestAuthenticationModule" lockItem="true" />
                <add name="IISCertificateMappingAuthenticationModule" lockItem="true" />
                <add name="IpRestrictionModule" lockItem="true" />
                <add name="DynamicIpRestrictionModule" lockItem="true" />
                <add name="CustomLoggingModule" lockItem="true" />
                <add name="CgiModule" lockItem="true" />
                <add name="FastCgiModule" lockItem="true" />
                <add name="ApplicationInitializationModule" lockItem="true" />
                <add name="WebSocketModule" lockItem="true" />
                <add name="RewriteModule" />
                <add name="OutputCache" type="System.Web.Caching.OutputCacheModule" preCondition="managedHandler" />
                <add name="Session" type="System.Web.SessionState.SessionStateModule" preCondition="managedHandler" />
                <add name="WindowsAuthentication" type="System.Web.Security.WindowsAuthenticationModule" preCondition="managedHandler" />
                <add name="FormsAuthentication" type="System.Web.Security.FormsAuthenticationModule" preCondition="managedHandler" />
                <add name="DefaultAuthentication" type="System.Web.Security.DefaultAuthenticationModule" preCondition="managedHandler" />
                <add name="RoleManager" type="System.Web.Security.RoleManagerModule" preCondition="managedHandler" />
                <add name="UrlAuthorization" type="System.Web.Security.UrlAuthorizationModule" preCondition="managedHandler" />
                <add name="FileAuthorization" type="System.Web.Security.FileAuthorizationModule" preCondition="managedHandler" />
                <add name="AnonymousIdentification" type="System.Web.Security.AnonymousIdentificationModule" preCondition="managedHandler" />
                <add name="Profile" type="System.Web.Profile.ProfileModule" preCondition="managedHandler" />
                <add name="UrlMappingsModule" type="System.Web.UrlMappingsModule" preCondition="managedHandler" />
                <add name="ConfigurationValidationModule" lockItem="true" />
                <add name="UrlRoutingModule-4.0" type="System.Web.Routing.UrlRoutingModule" preCondition="managedHandler,runtimeVersionv4.0" />
                <add name="ScriptModule-4.0" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" preCondition="managedHandler,runtimeVersionv4.0" />
                <add name="ServiceModel-4.0" type="System.ServiceModel.Activation.ServiceHttpModule, System.ServiceModel.Activation, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" preCondition="managedHandler,runtimeVersionv4.0" />
                <add name="ServiceModel" type="System.ServiceModel.Activation.HttpModule, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" preCondition="managedHandler,runtimeVersionv2.0" />
        </modules>

//System.Web.Caching.OutputCacheModule
        // Token: 0x0600672E RID: 26414 RVA: 0x0016C418 File Offset: 0x0016A618
        void IHttpModule.Init(HttpApplication app)
        {
            OutputCacheSection outputCache = RuntimeConfig.GetAppConfig().OutputCache;
            if (outputCache.EnableOutputCache)
            {
                app.ResolveRequestCache += this.OnEnter;
                app.UpdateRequestCache += this.OnLeave;
            }
        }

// System.Web.SessionState.SessionStateModule
/// <summary>Calls initialization code when a <see cref="T:System.Web.SessionState.SessionStateModule" /> object is created.</summary>
/// <param name="app">The current application. </param>
/// <exception cref="T:System.Web.HttpException">The <see langword="mode" /> attribute in the sessionState Element (ASP.NET Settings Schema) configuration element is set to <see cref="F:System.Web.SessionState.SessionStateMode.StateServer" /> or <see cref="F:System.Web.SessionState.SessionStateMode.SQLServer" />, and the ASP.NET application has less than <see cref="F:System.Web.AspNetHostingPermissionLevel.Medium" /> trust.</exception>
/// <exception cref="T:System.Configuration.ConfigurationErrorsException">The <see langword="mode" /> attribute in the sessionState Element (ASP.NET Settings Schema) configuration element is set to <see cref="F:System.Web.SessionState.SessionStateMode.Custom" /> and the <see langword="customProvider" /> attribute is empty or does not exist.-or-The <see langword="mode" /> attribute in the sessionState Element (ASP.NET Settings Schema) configuration element is set to <see cref="F:System.Web.SessionState.SessionStateMode.Custom" /> and the provider identified by name in the <see langword="customProvider" /> attribute has not been added to the providers Element for sessionState (ASP.NET Settings Schema) sub-element.</exception>
// Token: 0x06001263 RID: 4707 RVA: 0x000333F0 File Offset: 0x000315F0
public void Init(HttpApplication app)
{
    bool flag = false;
    SessionStateSection sessionState = RuntimeConfig.GetAppConfig().SessionState;
    if (!this.s_oneTimeInit)
    {
        SessionStateModule.s_lock.AcquireWriterLock();
        try
        {
            if (!this.s_oneTimeInit)
            {
                this.InitModuleFromConfig(app, sessionState);
                flag = true;
                if (!SessionStateModule.CheckTrustLevel(sessionState))
                {
                    SessionStateModule.s_trustLevelInsufficient = true;
                }
                SessionStateModule.s_timeout = (int)sessionState.Timeout.TotalMinutes;
                SessionStateModule.s_useHostingIdentity = sessionState.UseHostingIdentity;
                if (sessionState.Mode == SessionStateMode.InProc && this._usingAspnetSessionIdManager)
                {
                    SessionStateModule.s_allowInProcOptimization = true;
                }
                if (sessionState.Mode != SessionStateMode.Custom && sessionState.Mode != SessionStateMode.Off && !sessionState.RegenerateExpiredSessionId)
                {
                    SessionStateModule.s_allowDelayedStateStoreItemCreation = true;
                }
                SessionStateModule.s_configExecutionTimeout = RuntimeConfig.GetConfig().HttpRuntime.ExecutionTimeout;
                SessionStateModule.s_configRegenerateExpiredSessionId = sessionState.RegenerateExpiredSessionId;
                SessionStateModule.s_configCookieless = sessionState.Cookieless;
                SessionStateModule.s_configMode = sessionState.Mode;
                this.s_oneTimeInit = true;
            }
        }
        finally
        {
            SessionStateModule.s_lock.ReleaseWriterLock();
        }
    }
    if (!flag)
    {
        this.InitModuleFromConfig(app, sessionState);
    }
    if (SessionStateModule.s_trustLevelInsufficient)
    {
        throw new HttpException(SR.GetString("Session_state_need_higher_trust"));
    }
}

// System.Web.Profile.ProfileModule
/// <summary>Calls initialization code when a <see cref="T:System.Web.Profile.ProfileModule" /> object is created.</summary>
/// <param name="app">The current application. </param>
// Token: 0x06001427 RID: 5159 RVA: 0x0003AFD8 File Offset: 0x000391D8
public void Init(HttpApplication app)
{
    if (ProfileManager.Enabled)
    {
        app.AcquireRequestState += this.OnEnter;
        if (ProfileManager.AutomaticSaveEnabled)
        {
            app.EndRequest += this.OnLeave;
        }
    }
}

// System.Web.Security.WindowsAuthenticationModule
/// <summary>Initializes the <see cref="T:System.Web.Security.WindowsAuthenticationModule" /> object.</summary>
/// <param name="app">The current <see cref="T:System.Web.HttpApplication" /> instance. </param>
// Token: 0x06004D66 RID: 19814 RVA: 0x0010CA14 File Offset: 0x0010AC14
public void Init(HttpApplication app)
{
    app.AuthenticateRequest += this.OnEnter;
}

// System.Web.Security.FormsAuthenticationModule
/// <summary>Initializes the <see cref="T:System.Web.Security.FormsAuthenticationModule" /> object.</summary>
/// <param name="app">The current <see cref="T:System.Web.HttpApplication" /> instance. </param>
// Token: 0x06004BF8 RID: 19448 RVA: 0x00102EF4 File Offset: 0x001010F4
public void Init(HttpApplication app)
{
    if (!FormsAuthenticationModule._fAuthChecked)
    {
        FormsAuthenticationModule._fAuthRequired = (AuthenticationConfig.Mode == AuthenticationMode.Forms);
        FormsAuthenticationModule._fAuthChecked = true;
    }
    if (FormsAuthenticationModule._fAuthRequired)
    {
        FormsAuthentication.Initialize();
        app.AuthenticateRequest += this.OnEnter;
        app.EndRequest += this.OnLeave;
    }
}

// System.Web.Security.DefaultAuthenticationModule
/// <summary>Initializes the <see cref="T:System.Web.Security.DefaultAuthenticationModule" /> object.</summary>
/// <param name="app">The current <see cref="T:System.Web.HttpApplication" /> instance. </param>
// Token: 0x06004B84 RID: 19332 RVA: 0x00100A9C File Offset: 0x000FEC9C
public void Init(HttpApplication app)
{
    if (HttpRuntime.UseIntegratedPipeline)
    {
        app.PostAuthenticateRequest += this.OnEnter;
        return;
    }
    app.DefaultAuthentication += this.OnEnter;
}

// System.Web.Security.RoleManagerModule
/// <summary>Associates the role manager with the specified application.</summary>
/// <param name="app">The <see cref="T:System.Web.HttpApplication" /> to associate the <see cref="T:System.Web.Security.RoleManagerModule" /> with.</param>
// Token: 0x06004CC1 RID: 19649 RVA: 0x001060BA File Offset: 0x001042BA
public void Init(HttpApplication app)
{
    if (Roles.Enabled)
    {
        app.PostAuthenticateRequest += this.OnEnter;
        app.EndRequest += this.OnLeave;
    }
}

// System.Web.Security.UrlAuthorizationModule
/// <summary>Initializes the <see cref="T:System.Web.Security.UrlAuthorizationModule" /> object.</summary>
/// <param name="app">The current <see cref="T:System.Web.HttpApplication" /> instance. </param>
// Token: 0x06004D51 RID: 19793 RVA: 0x0010C674 File Offset: 0x0010A874
public void Init(HttpApplication app)
{
    app.AuthorizeRequest += this.OnEnter;
}

// System.Web.Security.FileAuthorizationModule
/// <summary>Initializes the <see cref="T:System.Web.Security.FileAuthorizationModule" /> object.</summary>
/// <param name="app">The current <see cref="T:System.Web.HttpApplication" /> instance. </param>
// Token: 0x06004BA3 RID: 19363 RVA: 0x00101636 File Offset: 0x000FF836
public void Init(HttpApplication app)
{
    app.AuthorizeRequest += this.OnEnter;
}

// System.Web.Security.AnonymousIdentificationModule
/// <summary>Initializes the <see cref="T:System.Web.Security.AnonymousIdentificationModule" /> object.</summary>
/// <param name="app">The current <see cref="T:System.Web.HttpApplication" /> instance. </param>
// Token: 0x06004B4A RID: 19274 RVA: 0x000FF047 File Offset: 0x000FD247
public void Init(HttpApplication app)
{
    if (!AnonymousIdentificationModule.s_Initialized)
    {
        AnonymousIdentificationModule.Initialize();
    }
    if (AnonymousIdentificationModule.s_Enabled)
    {
        app.PostAuthenticateRequest += this.OnEnter;
    }
}

// System.Web.UrlMappingsModule
// Token: 0x0600104E RID: 4174 RVA: 0x0002D798 File Offset: 0x0002B998
public void Init(HttpApplication application)
{
    UrlMappingsSection urlMappings = RuntimeConfig.GetConfig().UrlMappings;
    bool flag = urlMappings.IsEnabled && urlMappings.UrlMappings.Count > 0;
    if (flag)
    {
        application.BeginRequest += this.OnEnter;
    }
}

// System.Web.Routing.UrlRoutingModule
/// <summary>Initializes a module and prepares it to handle requests.</summary>
/// <param name="application">An object that provides access to the methods, properties, and events common to all application objects in an ASP.NET application.</param>
// Token: 0x0600139D RID: 5021 RVA: 0x00038BC8 File Offset: 0x00036DC8
protected virtual void Init(HttpApplication application)
{
    if (application.Context.Items[UrlRoutingModule._contextKey] != null)
    {
        return;
    }
    application.Context.Items[UrlRoutingModule._contextKey] = UrlRoutingModule._contextKey;
    application.PostResolveRequestCache += this.OnApplicationPostResolveRequestCache;
}