概述
與以前版本不同，新的IIS版本中，不再在服務器上持有多數的功能（Instead of keeping the majority of functionality within the server itself），而是用一個名為“Web服務器引擎（Web server engine）”來替代。在這個Web服務器引擎上，可以根據需要，添加或者移除模塊，用以實現各種功能。比如，用身份驗證模塊來實現鑒定客戶端的證書的功能，用緩存模塊管理緩存行為。（模塊所在位置是工作者進程）
采用模塊的方式，有以下幾個優點：
（1）可以控制哪些模塊在服務器上使用。
（2）可以自定義模塊替代現有模塊或者引用新特性。
（3）可以自定義服務器的角色（You can customize a server to a specific role in your environment.）。
（4）更加安全和便捷的管理。移除不必要的模塊，可以減少服務器可能被攻擊的地方，以及減少內存占用，舍去對“不必要功能”的管理。
一、本地模塊（Native Modules）
在完全安裝的IIS7及以上版本中，可以找到本地模塊。根據需要，你可以移除它們或者用自定義模塊替代它們。
1.HTTP模塊
即在請求處理管理中，針對HTTP的模塊，包括重定向請求、返回HTTP錯誤、響應。
| Module Name |
Description |
Resource |
| CustomErrorModule |
Sends default and configured HTTP error messages when an error status code is set on a response. |
Inetsrv\Custerr.dll |
| HttpRedirectionModule |
Supports configurable redirection for HTTP requests. |
Inetsrv\Redirect.dll |
| ProtocolSupportModule |
Performs protocol-related actions, such as setting response headers and redirecting headers based on configuration. |
Inetsrv\Protsup.dll |
| RequestFilteringModule |
Added in IIS 7.5. Filters requests as configured to control protocol and content behavior. |
Inetsrv\modrqflt.dll |
| WebDAVModule |
Added in IIS 7.5. Allows more secure publishing of content by using HTTP over SSL. |
Inetsrv\WebDAV.dll |
2.安全模塊
即在請求處理管理中，執行與安全相關的任務的模塊。根據身份驗證方案，選擇相應的模塊（各模塊是獨立的）。也包括URL驗證模塊和請求過濾模塊。
| Module Name |
Description |
Resource |
| AnonymousAuthenticationModule |
Performs Anonymous authentication |
Inetsrv\Authanon.dll |
| BasicAuthenticationModule |
Performs Basic authentication. |
Inetsrv\Authbas.dll |
| CertificateMappingAuthenticationModule |
Performs Certificate Mapping authentication using Active Directory. |
Inetsrv\Authcert.dll |
| DigestAuthenticationModule |
Performs Digest authentication. |
Inetsrv\Authmd5.dll |
| IISCertificateMappingAuthenticationModule |
Performs Certificate Mapping authentication using IIS certificate configuration. |
Inetsrv\Authmap.dll |
| RequestFilteringModule |
Performs URLScan tasks such as configuring allowed verbs |
Inetsrv\Modrqflt.dll |
| UrlAuthorizationModule |
Performs URL authorization. |
Inetsrv\Urlauthz.dll |
| WindowsAuthenticationModule |
Performs NTLM integrated authentication. |
Inetsrv\Authsspi.dll |
| IpRestrictionModule |
Restricts IPv4 addresses listed in the ipSecurity list in configuration. |
Inetsrv\iprestr.dll |
| Module Name |
Description |
Resource |
| AnonymousAuthenticationModule |
Performs Anonymous authentication when no other authentication method succeeds. |
Inetsrv\Authanon.dll |
| BasicAuthenticationModule |
Performs Basic authentication. |
Inetsrv\Authbas.dll |
| CertificateMappingAuthenticationModule |
Performs Certificate Mapping authentication using Active Directory. |
Inetsrv\Authcert.dll |
| DigestAuthenticationModule |
Performs Digest authentication. |
Inetsrv\Authmd5.dll |
| IISCertificateMappingAuthenticationModule |
Performs Certificate Mapping authentication using IIS certificate configuration. |
Inetsrv\Authmap.dll |
| RequestFilteringModule |
Performs URLScan tasks such as configuring allowed verbs and file name extensions, setting limits, and scanning for bad character sequences. |
Inetsrv\Modrqflt.dll |
| UrlAuthorizationModule |
Performs URL authorization. |
Inetsrv\Urlauthz.dll |
| WindowsAuthenticationModule |
Performs NTLM integrated authentication. |
Inetsrv\Authsspi.dll |
| IpRestrictionModule |
Restricts IPv4 addresses listed in the ipSecurity list in configuration. |
Inetsrv\iprestr.dll |
3.內容模塊
即在請求處理管理中，執行與內容相關的任務的模塊。包括處理靜態文件請求、返回默認頁面（未指定請求何資源時）、列舉文件夾等模塊。
| Module Name |
Description |
Resource |
| CgiModule |
Executes Common Gateway Interface (CGI) processes to build response output. |
Inetsrv\Cgi.dll |
| DefaultDocumentModule |
Attempts to return a default document for requests made to the parent directory. |
Inetsrv\Defdoc.dll |
| DirectoryListingModule |
Lists the contents of a directory. |
Inetsrv\dirlist.dll |
| IsapiModule |
Hosts ISAPI extension DLLs. |
Inetsrv\Isapi.dll |
| IsapiFilterModule |
Supports ISAPI filter DLLs. |
Inetsrv\Filter.dll |
| ServerSideIncludeModule |
Processes server-side includes code. |
Inetsrv\Iis_ssi.dll |
| StaticFileModule |
Serves static files. |
Inetsrv\Static.dll |
| FastCgiModule |
Supports FastCGI, which provides a high-performance alternative to CGI. |
Inetsrv\iisfcgi.dll |
4.壓縮模塊
即在請求處理管理中，有兩個模塊實現壓縮功能。
| Module Name |
Description |
Resource |
| DynamicCompressionModule |
Compresses responses and applies Gzip compression transfer coding to responses. |
Inetsrv\Compdyn.dll |
| StaticCompressionModule |
Performs pre-compression of static content. |
Inetsrv\Compstat.dll |
5.緩存模塊
即在請求處理管理中，執行與緩存相關的任務的模塊。緩存可以改善網站和應用程序的性能。它通過在服務器的內存中保存已經處理過的信息（比如網頁）來實現。如果后續的講求是請求相同的資源，則這些信息將被重復利用。
| Module Name |
Description |
Resource |
| FileCacheModule |
Provides user mode caching for files and file handles. |
Inetsrv\Cachfile.dll |
| HTTPCacheModule |
Provides kernel mode and user mode caching in HTTP.sys. |
Inetsrv\Cachhttp.dll |
| TokenCacheModule |
Provides user mode caching of user name and token pairs for modules that produce Windows user principals. |
Inetsrv\Cachtokn.dll |
| UriCacheModule |
Provides user mode caching of URL information. |
Inetsrv\Cachuri.dll |
6.日志和診斷模塊
即在請求處理管理中，執行與日志和診斷相關的任務和模塊。日志模塊支持加載自定義模塊，和向HTTP.SYS傳遞信息。診斷模塊在請求處理過程中，跟蹤並報告事件。
| Module Name |
Description |
Resource |
| CustomLoggingModule |
Loads custom logging modules. |
Inetsrv\Logcust.dll |
| FailedRequestsTracingModule |
Supports the Failed Request Tracing feature. |
Inetsrv\Iisfreb.dll |
| HttpLoggingModule |
Passes information and processing status to HTTP.sys for logging. |
Inetsrv\Loghttp.dll |
| RequestMonitorModule |
Tracks requests currently executing in worker processes and reports information with Runtime Status and Control Application Programming Interface (RSCA). |
Inetsrv\Iisreqs.dll |
| TracingModule |
Reports events to Microsoft Event Tracing for Windows (ETW). |
Inetsrv\Iisetw.dll |
7.托管支持模塊（Managed Support Modules）
即在請求處理管理中，有兩個模塊用於支持托管代碼集成（A couple of modules in IIS support managed integration in the IIS request-processing pipeline.）。
| Module Name |
Description |
Resource |
| ManagedEngine |
Provides integration of managed code modules in the IIS request-processing pipeline. |
Microsoft.NET\Framework\v2.0.50727\webengine.dll |
| ConfigurationValidationModule |
Validates configuration issues, such as when an application is running in Integrated mode but has handlers or modules declared in the system.web section. |
Inetsrv\validcfg.dll |
二、托管模塊（Managed Modules）
除本地模塊之外，IIS允許你使用托管代碼模塊來擴展IIS的功能。一些托管模塊會對應一個本地模塊（比如：UrlAuthorization）。這個本地模塊是可供替代的選擇。
托管模塊依賴於ManagedEngine模塊
| Module Name |
Description |
Resource |
| AnonymousIdentification |
Manages anonymous identifiers, which are used by features that support anonymous identification such as ASP.NET profile. |
System.Web.Security.AnonymousIdentificationModule |
| DefaultAuthentication |
Ensures that an authentication object is present in the context. |
System.Web.Security.DefaultAuthenticationModule |
| FileAuthorization |
Verifies that a user has permission to access the requested file. |
System.Web.Security.FileAuthorizationModule |
| FormsAuthentication |
Supports authentication by using Forms authentication. |
System.Web.Security.FormsAuthenticationModule |
| OutputCache |
Supports output caching. |
System.Web.Caching.OutputCacheModule |
| Profile |
Manages user profiles by using ASP.NET profile, which stores and retrieves user settings in a data source such as a database. |
System.Web.Profile.ProfileModule |
| RoleManager |
Manages a RolePrincipal instance for the current user. |
System.Web.Security.RoleManagerModule |
| Session |
Supports maintaining session state, which enables storage of data specific to a single client within an application on the server. |
System.Web.SessionState.SessionStateModule |
| UrlAuthorization |
Determines whether the current user is permitted access to the requested URL, based on the user name or the list of roles of which a user is a member. |
System.Web.Security.UrlAuthorizationModule |
| UrlMappingsModule |
Supports mapping a real URL to a more user-friendly URL. |
System.Web.UrlMappingsModule |
| WindowsAuthentication |
Sets the identity of the user for an ASP.NET application when Windows authentication is enabled. |
System.Web.Security.WindowsAuthenticationModule
|