Version 0.11.0

[tomchristie]

0.11.0 (September 22nd, 2020)

The Transport API with 0.11.0 has a couple of significant changes.

Firstly we've moved changed the request interface in order to allow extensions, which will later enable us to support features
such as trailing headers, HTTP/2 server push, and CONNECT/Upgrade connections.

The interface changes from:

def request(method, url, headers, stream, timeout):
    return (http_version, status_code, reason, headers, stream)

To instead including an optional dictionary of extensions on the request and response:

def request(method, url, headers, stream, ext):
    return (status_code, headers, stream, ext)

Having an open-ended extensions point will allow us to add later support for various optional features, that wouldn't otherwise be supported without these API changes.

In particular:

• Trailing headers support.
• HTTP/2 Server Push
• sendfile.
• Exposing raw connection on CONNECT, Upgrade, HTTP/2 bi-di streaming.
• Exposing debug information out of the API, including template name, template context.

Currently extensions are limited to:

• request: timeout - Optional. Timeout dictionary.
• response: http_version - Optional. Include the HTTP version used on the response.
• response: reason - Optional. Include the reason phrase used on the response. Only valid with HTTP/1.*.

See encode/httpx#1274 (comment) for the history behind this.

Secondly, the async version of request is now namespaced as arequest.

This allows concrete transports to support both sync and async implementations on the same class.

Added

• Add curio support. (Pull Implement curio backend #168)
• Add anyio support, with backend="anyio". (Pull Added AnyIO support #169)

Changed

• Update the Transport API to use 'ext' for optional extensions. (Pull Version 0.11.0 #190)
• Update the Transport API to use .request and .arequest so implementations can support both sync and async. (Pull Use .arequest for the async version of the API. #189)

[tomchristie]

Let's push on with this.