build(deps): bump gunicorn from 26.1.0 to 26.2.0

[dependabot]

Bumps gunicorn from 26.1.0 to 26.2.0.

Release notes

Sourced from gunicorn's releases.

gunicorn 26.2.0

Cleartext HTTP/2 lands, and an HTTP/2 security fix.

Cleartext HTTP/2 (h2c)

http2_cleartext accepts prior-knowledge, upgrade, both or off (the default). Prior knowledge serves a connection that opens with the HTTP/2 preface; upgrade honours an HTTP/1.1 Upgrade: h2c request. Both work on the gthread, gevent and asgi workers.

This is for deployments where TLS is terminated by a proxy that speaks HTTP/2 upstream, so the hop into gunicorn no longer drops to HTTP/1.1. Only peers in forwarded_allow_ips are considered; everyone else is served HTTP/1.x exactly as if the setting were off. Each mechanism is enabled separately, so turning one on does not turn the other on.

Do not expose a cleartext HTTP/2 port to the internet.

Security

HTTP2Request built its headers straight from the stream, so nothing the HTTP/1 path enforces applied over HTTP/2: the underscore and header_map policy, duplicate Host and Content-Type, control characters in values, and the forwarded_allow_ips trust gate. An untrusted client could set SCRIPT_NAME and forge HTTP_* entries in the WSGI environ, and decide wsgi.url_scheme through :scheme. Both request classes now share one policy mixin, and the scheme comes from the transport.

If you serve HTTP/2, this is the reason to upgrade.

Other HTTP/2 fixes

WSGI responses were buffered whole before anything was sent; they stream now. HEAD, 204 and 304 no longer carry a body. Events read while blocked on a flow-control window were discarded, losing requests and body data outright. sendfile() is refused on HTTP/2 responses rather than bypassing framing.

Request bodies dropped on Upgrade requests

On the ASGI worker with the fast parser, any request carrying an Upgrade header reached the application with an empty body, whatever the header's value and with HTTP/2 switched off entirely. Fixed in gunicorn_h1c 0.6.9, which the fast extra now requires.

Full changelog: https://gunicorn.org/news/

Commits

• 36f2a3c gunicorn 26.2.0
• cbba350 test: cover the h2c edge paths that had none
• 9885411 Merge pull request #3703 from cormier/fix-inconsistency-in-control-socket-docs
• 86f0919 Merge pull request #3704 from methane/doc-wsgi-h1c
• 5853551 Merge pull request #3712 from Rotzbua/patch-1
• 7bce87e Merge pull request #3700 from benoitc/fix/sponsor-logo-path
• 972dfb0 Merge pull request #3690 from melbinjp/docs/contributing-settings-path
• 7b3f16b Merge pull request #3711 from benoitc/docs/http2-changelog
• 5bf237c http2: require gunicorn_h1c 0.6.9 and drop the upgrade body workaround
• 7cf0338 test: skip the fast-parser cases when gunicorn_h1c is absent
• Additional commits viewable in compare view

[github-actions]

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[jackseceng]

@dependabot rebase