When configuring dynamic compression in IIS, selecting content types reasonably can improve performance. First enable the dynamic compression module, install and configure web.config or IIS manager through the server manager. Secondly, set appropriate content types, such as HTML, CSS, JavaScript, and JSON, text content is suitable for compression, while pictures and videos are not suitable. Finally, pay attention to the impact of client compatibility and performance, monitor CPU load, client support status and small file compression effects, and adjust the configuration based on actual traffic to obtain the best benefits.

When configuring dynamic compression in IIS, selecting content types reasonably is the key to improving performance. Not all content is suitable for compression, and not all clients support compression formats. Correct settings not only save bandwidth, but also improve user experience.

Enable dynamic compression module

IIS may not have a dynamic compression module installed by default, you need to confirm whether it is enabled first. The module can be checked and installed via Add Roles and Features in Server Manager. If installed, you can configure it in web.config or IIS manager.

Once the module is available, you can start state compression by:

• Open IIS Manager
• Select the target site or application
• Double-click the "Compress" icon
• Check "Enable dynamic content compression"

After this step is completed, IIS will start trying to compress the dynamic response, but the default settings do not necessarily apply to your specific scenario.

Set the appropriate content type for compression

Not all MIME types are worth compressing. Generally speaking, text-based content (such as HTML, CSS, JavaScript) has significant compression effect, while binary files such as pictures and videos are already highly compressed, and it is not very meaningful to compress it again, and it may even increase the burden on the server.

You can configure which MIME types should be compressed in web.config . For example:

 <configuration>
  <system.webServer>
    <urlCompression doDynamicCompression="true">
      <dynamicTypes>
        <add mimeType="text/*" enabled="true" />
        <add mimeType="application/javascript" enabled="true" />
        <add mimeType="application/json" enabled="true" />
        <add mimeType="application/xml" enabled="true" />
        <add mimeType="image/*" enabled="false" />
      </dynamicTypes>
    </urlCompression>
  </system.webServer>
</configuration>

It is recommended to adjust these configurations according to the actual output content type. For example, if your API returns a large amount of JSON data, then make sure application/json is included.

Pay attention to client compatibility and performance impact

Although compression can reduce the transmission volume, the compression process itself will take up CPU resources. Especially in high concurrency environments, improper compression strategies can lead to excessive server load.

Also, not all clients can handle compressed content correctly. Although modern browsers generally support GZIP or DEFLATE compression, you still need to pay attention to the Accept-Encoding field in the request header in some old systems or specific API calls.

Some points to note include:

• Dynamic compression uses GZIP format by default, and some older versions of IE may have problems
• If a reverse proxy or CDN is used, confirm that they also support compressed content processing.
• For small files (such as a response of several KB), compression may lead to performance degradation in turn

Therefore, it is recommended to continuously monitor server performance and client feedback after dynamic compression is enabled, and some paths or user agents can be excluded if necessary.

Basically that's it. The configuration is not complicated, but the details must be adjusted in combination with the actual traffic characteristics to maximize the benefits.

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