:expectplugin now supports a new option,
:expect_threshold_size, meaning: the byte size threshold below which no
expectheader will be sent with requests with payload.
:compressionplugin now supports a new option,
:compression_threshold_size, meaning: the bytesize threshold below which request payload won’t be compressed before being sent.
for HTTP/2 connections, when
PINGframe is used to check connection availability; if successful, the connection will be reused.