Queueing. The browser queues requests before connection start and 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 after connection start for any of the reasons described in Queueing.
点下面这里,就可以看到这些字段的说明。
见 网络功能参考 中的描述。
也可以参考英文原版:
可能的原因就这 3 个。