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我在我的网站中使用“预连接”资源提示作为字体的 api

<link rel="preconnect" crossorigin href="https://fonts.gstatic.com" />

但是,当我在 chrome devtools 中检查瀑布分析https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2时,获取时的 DNS 查找和 SSL 连接。

当我检查 netlog-viewer.appspot.com 中的网络日志时,HTTP_STREAM_JOB_CONTROLLER结果如下:

https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2
Start Time: 2020-02-18 12:14:04.660

t=9003 [st=  0] +HTTP_STREAM_JOB_CONTROLLER  [dt=123]
                 --> is_preconnect = false
                 --> url = "https://fonts.gstatic.com/s/roboto/v20/KFOmCnqEu92Fr1Mu4mxKKTU1Kg.woff2"
t=9003 [st=  0]    HTTP_STREAM_JOB_CONTROLLER_BOUND
                   --> source_dependency = 3231 (URL_REQUEST)
t=9003 [st=  0]   +PROXY_RESOLUTION_SERVICE  [dt=0]
t=9003 [st=  0]      PROXY_RESOLUTION_SERVICE_RESOLVED_PROXY_LIST
                     --> pac_string = "DIRECT"
t=9003 [st=  0]   -PROXY_RESOLUTION_SERVICE
t=9003 [st=  0]    HTTP_STREAM_JOB_CONTROLLER_PROXY_SERVER_RESOLVED
                   --> proxy_server = "DIRECT"
t=9003 [st=  0]    HTTP_STREAM_REQUEST_STARTED_JOB
                   --> source_dependency = 3234 (HTTP_STREAM_JOB)
t=9126 [st=123] -HTTP_STREAM_JOB_CONTROLLER

为什么显示为is_preconnect假?

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