Python SDK (qstash-py):
Flow Control Parallelism and Rate. See here Addressed a few minor bugs. See the full changelog here
QStash Server:
Introduced RateLimit and Parallelism controls to manage the rate and concurrency of message processing. Learn more here. Improved connection timeout detection mechanism to enhance scalability. Added several new features to better support webhook use cases:
Support for saving headers in a URL group. See here. Ability to pass configuration parameters via query strings instead of headers. See here. Introduced a new Upstash-Header-Forward header to forward all headers from the incoming request. See here.
Fetched April 8, 2026