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(yīng)在自己的網(wǎng)絡(luò)服務(wù)器上啟用壓縮功能。以下這些參考展示了某些熱門網(wǎng)絡(luò)服務(wù)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(wù)器和防病毒軟件可以停用壓縮功能。由于PageSpeed Insights是根據(jù)實際返回到客戶端的標(biāo)頭來報告結(jié)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(wù)器的客戶端計算機上運行分析（許多代理服務(wù)器是透明的，您甚至可能意識不到代理服務(wù)器介入您的客戶端和網(wǎng)絡(luò)服務(wù)器），則可能會導(dǎo)致出現(xiàn)此問題。
要確定代理服務(wù)器是否為導(dǎo)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(biāo)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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