h2: A pure-Python HTTP/2 protocol stack

h2 is a HTTP/2 protocol stack, written entirely in Python. The goal of h2 is to be a common HTTP/2 stack for the Python ecosystem, usable in all programs regardless of concurrency model or environment.

To achieve this, h2 is entirely self-contained: it does no I/O of any kind, leaving that up to a wrapper library to control. This ensures that it can seamlessly work in all kinds of environments, from single-threaded code to Twisted.

Its goal is to be 100% compatible with RFC 7540, implementing a complete HTTP/2 protocol stack build on a set of finite state machines. Its secondary goals are to be fast, clear, and efficient.

For usage examples, see Getting Started: Writing Your Own HTTP/2 Server or consult the examples in the repository.

Contents

• Installation
• Getting Started: Writing Your Own HTTP/2 Server
  • Connections
  • Events
  • Writing Your Server
• Negotiating HTTP/2
  • HTTPS URLs (ALPN)
  • HTTP URLs (Upgrade)
  • Prior Knowledge
• Code Examples
  • Example Servers
  • Example Clients
• Advanced Usage
  • Priority
  • Related Events
  • Connections: Advanced
  • Headers
  • Flow Control
• Low-Level Details
  • State Machines
• h2 API
  • Semantic Versioning
  • Connection
  • Configuration
  • Events
  • Exceptions
  • HTTP/2 Error Codes
  • Settings
• Testimonials
  • Glyph Lefkowitz
• Release Process
  • Versioning
  • Maintenance
  • Supported Release Series’
• Release Notes
  • High Level Notes
• Release History
  • 4.1.0 (2021-10-05)
  • 4.0.0 (2020-09-19)
  • 3.2.0 (2020-02-08)
  • 3.1.1 (2019-08-02)
  • 3.1.0 (2019-01-22)
  • 3.0.1 (2017-04-03)
  • 2.6.2 (2017-04-03)
  • 2.5.4 (2017-04-03)
  • 3.0.0 (2017-03-24)
  • 2.6.1 (2017-03-16)
  • 2.5.3 (2017-03-16)
  • 2.4.4 (2017-03-16)
  • 2.6.0 (2017-02-28)
  • 2.5.2 (2017-01-27)
  • 2.4.3 (2017-01-27)
  • 2.3.4 (2017-01-27)
  • 2.5.1 (2016-12-17)
  • 2.5.0 (2016-10-25)
  • 2.4.2 (2016-10-25)
  • 2.3.3 (2016-10-25)
  • 2.2.7 (2016-10-25)
  • 2.4.1 (2016-08-23)
  • 2.3.2 (2016-08-23)
  • 2.4.0 (2016-07-01)
  • 2.3.1 (2016-05-12)
  • 2.2.5 (2016-05-12)
  • 2.3.0 (2016-04-26)
  • 2.2.4 (2016-04-25)
  • 2.1.5 (2016-04-25)
  • 2.2.3 (2016-04-13)
  • 2.1.4 (2016-04-13)
  • 2.2.2 (2016-04-05)
  • 2.2.1 (2016-03-23)
  • 2.2.0 (2016-03-23)
  • 2.1.3 (2016-03-16)
  • 2.1.2 (2016-02-17)
  • 2.1.1 (2016-02-05)
  • 2.1.0 (2016-02-02)
  • 2.0.0 (2016-01-25)
  • 1.1.1 (2015-11-17)
  • 1.1.0 (2015-10-28)
  • 1.0.0 (2015-10-15)