This rule is triggered when PageSpeed Insights detects that a compressed resource on a Web page is not provided with HTTP compression.

Many network servers can compress files into a file by calling a third-party module or using a built-in program gzipFormat, and then send the compressed file for download. This can save you some time when downloading the resources needed to render the website.

您應在自己的網絡服務器上啟用壓縮功能。以下這些參考展示了某些熱門網絡服務器上所啟用的壓縮功能：

• Apache: Adoptingmod_deflate
• Nginx：采用HttpGzipModule
• IIS：Configuring HTTP compression

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PageSpeed Insights reports that many static content files need to be compressed into gzip format, but I have configured my network server to provide these files in gzip compressed format. Why can't PageSpeed Insights recognize these compressed files?

在將文件下載到客戶端計算機時，代理服務器和防病毒軟件可以停用壓縮功能。由于PageSpeed Insights是根據實際返回到客戶端的標頭來報告結果，因此，如果您要在使用此類防病毒軟件或在后面放置中級代理服務器的客戶端計算機上運行分析（許多代理服務器是透明的，您甚至可能意識不到代理服務器介入您的客戶端和網絡服務器），則可能會導致出現此問題。
要確定代理服務器是否為導致此問題的原因，您可以使用PageSpeed Insights Chrome ExtensionsTo check the header:

1. Run PageSpeed on the related web page.
2. 點擊顯示資源標簽。
3. Expand the URL of the resource marked uncompressed. The system displays the header displayed with the resource. If you see a file namedVia、Forwarded或Proxy-ConnectionIndicates that the proxy server has provided the resource.

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