IIS和IIS Express有什么区别？

IIS is a full-featured production web server for hosting live websites with advanced capabilities like application pools and SSL. 2. IIS Express is a lightweight, on-demand server for local development, pre-installed with Visual Studio and ideal for testing. 3. IIS runs as a Windows service and supports multiple sites and external access, while IIS Express runs under the user account and is limited to local machine access. 4. IIS requires installation via Windows Features and is highly configurable through IIS Manager, whereas IIS Express starts during debugging and shuts down afterward. 5. Use IIS for production and staging environments; use IIS Express for development to mimic IIS behavior without administrative overhead.

IIS and IIS Express are both web servers developed by Microsoft for hosting and serving web applications, but they differ in purpose, features, and usage scenarios.

Full-Featured Web Server (IIS)

IIS (Internet Information Services) is a full-featured web server designed for production environments. It runs as a Windows service and supports advanced capabilities like application pools, SSL, URL rewriting, FTP, and integration with Windows authentication. It's ideal for hosting live websites and web applications on Windows Server or Windows desktop systems. Key points:

• Installed separately via Windows Features
• Supports multiple sites, bindings, and host headers
• Highly configurable through IIS Manager
• Runs continuously in the background
• Used in production and staging environments

Lightweight Development Server (IIS Express)

IIS Express is a lightweight, self-contained version of IIS tailored for developers. It combines the core functionality of IIS with the ease of use of a development server. It runs on-demand when you start debugging in Visual Studio and shuts down when the session ends. Key points:

• Pre-installed with Visual Studio or available as a standalone download
• Runs under the user account, not as a system service
• Supports SSL and host headers, but with simpler configuration
• Limited to local machine access by default (not for external clients)
• Ideal for testing and debugging during development

Use Case Differences

IIS is used when you need a robust, scalable server for hosting public websites. IIS Express is meant for local development—faster setup, no admin privileges required, and closely mimics IIS behavior without the overhead. For example, when building an ASP.NET app in Visual Studio, IIS Express automatically launches to serve the app locally. When deploying to a server, you'd configure the app on full IIS. Basically, IIS Express gives developers an IIS-like experience on their machine, while IIS is the real deal for production.

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