问题
Here is my use-case :
I'me developping Static Site Generator and stuff for them.
I would like to host on static pages (like gitlab-pages or github-pages) some demo of my stuff.
So I can't use server-side tricks to simulate slow connexion.
My demo page should look like this :
- see my stuff in normal mode
- see my stuff before optimisation with a simulated 56k connection
- see my stuff after optimisation with a simulated 56k connection
I've not found any service-worker built for this.
Any Idea where i can found one or how i can build one for this ?
回答1:
The tc or Traffic Control command should be able to handle the job for you. tc can do a lot but it sounds like you just need to to 'shape` traffic:
SHAPING When traffic is shaped, its rate of transmission is under control. Shaping may be more than lowering the available bandwidth - it is also used to smooth out bursts in traffic for better network behaviour. Shaping occurs on egress.
Simulating something like cell delay is pretty easy, in the below example I inject a delay of 100 +/- 10ms on interface eth1.
tc qdisc add dev eth1 root netem delay 100ms 10ms
Naturally this is annoying because it is on a primary interface and it does not handle throughput limiting. To do that you need to go into how tc works more (parent/child queues, etc). This writeup explains how to throttle the bandwidth, so if you do that and then add the delay mentioned above, then you should have a pretty solid emulation.
来源：https://stackoverflow.com/questions/65485346/how-to-slow-down-a-service-worker-to-simulate-56k-or-2g-3g-slow-connection