The recent effective delivery bandwidth of the connection towards the client in bytes per second. This gives a reasonable estimate of current connection performance by excluding periods when the connection was idle due to lack of application data to send.
client.socket.tcpi_delivery_rate is used in the following code examples. Examples apply VCL to real-world use cases and can be deployed as they are, or adapted for your own service. See the full list of code examples for more inspiration.
Click RUN on a sample below to provision a Fastly service, execute the code on Fastly, and see how the function behaves.
Fastly offers a myriad of different variables that you can log. See and test a large collection here.