![]() Network Transfer Format for Java ArchivesĪny available content encoding not explicitly requestedįor more information, see the IANA Official Content Coding List. "No encoding" identifier: The response must not be encoded. Content encoding designations supported by the response compression middleware are shown in the following table. When a server sends compressed content, it must include information in the Content-Encoding header on how the compressed response is encoded. When a client can process compressed content, the client must inform the server of its capabilities by sending the Accept-Encoding header with the request. The overhead of compressing small files may produce a compressed file larger than the uncompressed file. Don't compress files smaller than about 150-1000 bytes, depending on the file's content and the efficiency of compression. When attempting to further compress a natively compressed response, any small extra reduction in size and transmission time will likely be overshadowed by the time it takes to process the compression. Don't compress natively compressed assets, such as PNG files. Responses not natively compressed typically include CSS, JavaScript, HTML, XML, and JSON. Usually, any response not natively compressed can benefit from response compression. Unable to use the following server-based compression technologies:.Use Response Compression Middleware when the app is: HTTP.sys server and Kestrel server don't currently offer built-in compression support. The performance of the response compression middleware probably won't match that of the server modules. Use server-based response compression technologies in IIS, Apache, or Nginx. When to use Response Compression Middleware ![]() An unexpected content-encoding response header value may be the result of the web server and not the ASP.NET Core app configuration. When reviewing response headers, take note of the Server value. For information on mitigating BREACH attacks, see mitigations at Įven when EnableForHttps is disabled in the app, IIS, IIS Express, and Azure App Service can apply gzip at the IIS web server. For more information, see Prevent Cross-Site Request Forgery (XSRF/CSRF) attacks in ASP.NET Core. Mitigated in ASP.NET Core with antiforgery tokens. Using compression with dynamically generated pages can expose the app to CRIME and BREACH attacks. One way to reduce payload sizes is to compress an app's responses.Ĭompressed responses over secure connections can be controlled with the EnableForHttps option, which is disabled by default because of the security risk. Reducing the size of the response usually increases the responsiveness of an app, often dramatically.
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