Module ping

HTTP2 Ping usage

hyper uses HTTP2 pings for two purposes:

1. Adaptive flow control using BDP
2. Connection keep-alive

Both cases are optional.

BDP Algorithm

1. When receiving a DATA frame, if a BDP ping isn’t outstanding: 1a. Record current time. 1b. Send a BDP ping.
2. Increment the number of received bytes.
3. When the BDP ping ack is received: 3a. Record duration from sent time. 3b. Merge RTT with a running average. 3c. Calculate bdp as bytes/rtt. 3d. If bdp is over 2/3 max, set new max to bdp and update windows.

Structs

Bdp 🔒

Config 🔒

KeepAlive 🔒

KeepAliveTimedOut 🔒

Ponger 🔒

Recorder 🔒

Shared 🔒

Enums

KeepAliveState 🔒

Ponged 🔒

Constants

BDP_LIMIT 🔒

Any higher than this likely will be hitting the TCP flow control.

Functions

channel 🔒

disabled 🔒

seconds 🔒

Type Aliases

WindowSize 🔒