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Chrome Network底层日志可以这么查：
- chrome://net-export/记录日志
-
https://netlog-viewer.appspot.com/#import分析日志
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请求各阶段说明
-
Queueing. The browser queues requests when:
- There are higher priority requests.
- There are already six TCP connections open for this origin, which is the limit. Applies to HTTP/1.0 and HTTP/1.1 only.
- The browser is briefly allocating space in the disk cache
- Stalled. The request could be stalled for any of the reasons described in Queueing.
- DNS Lookup. The browser is resolving the request's IP address.
- Proxy negotiation. The browser is negotiating the request with a proxy server.
- Request sent. The request is being sent.
- ServiceWorker Preparation. The browser is starting up the service worker.
- Request to ServiceWorker. The request is being sent to the service worker.
- Waiting (TTFB). The browser is waiting for the first byte of a response. TTFB stands for Time To First Byte. This timing includes 1 round trip of latency and the time the server took to prepare the response.
- Content Download. The browser is receiving the response.
- Receiving Push. The browser is receiving data for this response via HTTP/2 Server Push.
- Reading Push. The browser is reading the local data previously received.
参考资料
1、https://fex.baidu.com/blog/2015/01/chrome-stalled-problem-resolving-process/
2、https://developers.google.com/web/tools/chrome-devtools/network/reference#timing-explanation
3、https://stackoverflow.com/questions/27740692/request-stalled-for-a-long-time-occasionally-in-chrome
4、https://stackoverflow.com/questions/27513994/chrome-stalls-when-making-multiple-requests-to-same-resource
5、https://bugs.chromium.org/p/chromium/issues/detail?id=447463
6、https://dev.chromium.org/for-testers/providing-network-details
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