chore(deps): update dependency httpcore to v0.18.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
httpcore	==0.13.7 -> ==0.18.0

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Release Notes

encode/httpcore (httpcore)

v0.18.0

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• Add support for HTTPS proxies. (#​745, #​786)
• Drop Python 3.7 support. (#​727)
• Handle sni_hostname extension with SOCKS proxy. (#​774)
• Handle HTTP/1.1 half-closed connections gracefully. (#​641)
• Change the type of Extensions from Mapping[Str, Any] to MutableMapping[Str, Any]. (#​762)

v0.17.3

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• Support async cancellations, ensuring that the connection pool is left in a clean state when cancellations occur. (#​726)
• The networking backend interface has been added to the public API. Some classes which were previously private implementation detail are now part of the top-level public API. (#​699)
• Graceful handling of HTTP/2 GoAway frames, with requests being transparently retried on a new connection. (#​730)
• Add exceptions when a synchronous trace callback is passed to an asynchronous request or an asynchronous trace callback is passed to a synchronous request. (#​717)
• Drop Python 3.7 support. (#​727)

v0.17.2

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• Add socket_options argument to ConnectionPool and HTTProxy classes. (#​668)
• Improve logging with per-module logger names. (#​690)
• Add sni_hostname request extension. (#​696)
• Resolve race condition during import of anyio package. (#​692)
• Enable TCP_NODELAY for all synchronous sockets. (#​651)

v0.17.1

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• If 'retries' is set, then allow retries if an SSL handshake error occurs. (#​669)
• Improve correctness of tracebacks on network exceptions, by raising properly chained exceptions. (#​678)
• Prevent connection-hanging behaviour when HTTP/2 connections are closed by a server-sent 'GoAway' frame. (#​679)
• Fix edge-case exception when removing requests from the connection pool. (#​680)
• Fix pool timeout edge-case. (#​688)

v0.17.0

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• Add DEBUG level logging. (#​648)
• Respect HTTP/2 max concurrent streams when settings updates are sent by server. (#​652)
• Increase the allowable HTTP header size to 100kB. (#​647)
• Add retries option to SOCKS proxy classes. (#​643)

v0.16.3

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• Allow ws and wss schemes. Allows us to properly support websocket upgrade connections. (#​625)
• Forwarding HTTP proxies use a connection-per-remote-host. Required by some proxy implementations. (#​637)
• Don't raise RuntimeError when closing a connection pool with active connections. Removes some error cases when cancellations are used. (#​631)
• Lazy import anyio, so that it's no longer a hard dependancy, and isn't imported if unused. (#​639)

v0.16.2

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• Revert 'Fix async cancellation behaviour', which introduced race conditions. (#​627)
• Raise RuntimeError if attempting to us UNIX domain sockets on Windows. (#​619)

v0.16.1

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• Fix HTTP/1.1 interim informational responses, such as "100 Continue". (#​605)

v0.16.0

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• Support HTTP/1.1 informational responses. (#​581)
• Fix async cancellation behaviour. (#​580)
• Support h11 0.14. (#​579)

v0.15.0

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• Drop Python 3.6 support (#​535)
• Ensure HTTP proxy CONNECT requests include timeout configuration. (#​506)
• Switch to explicit typing.Optional for type hints. (#​513)
• For trio map OSError exceptions to ConnectError. (#​543)

v0.14.7

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• Requests which raise a PoolTimeout need to be removed from the pool queue. (#​502)
• Fix AttributeError that happened when Socks5Connection were terminated. (#​501)

v0.14.6

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• Fix SOCKS support for http:// URLs. (#​492)
• Resolve race condition around exceptions during streaming a response. (#​491)

v0.14.5

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• SOCKS proxy support. (#​478)
• Add proxy_auth argument to HTTPProxy. (#​481)
• Improve error message on 'RemoteProtocolError' exception when server disconnects without sending a response. (#​479)

v0.14.4

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• Support HTTP/2 on HTTPS tunnelling proxies. (#​468)
• Fix proxy headers missing on HTTP forwarding. (#​456)
• Only instantiate SSL context if required. (#​457)
• More robust HTTP/2 handling. (#​253, #​439, #​440, #​441)

v0.14.3

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• Fix race condition when removing closed connections from the pool. (#​437)

v0.14.2

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• Failed connections no longer remain in the pool. (Pull #​433)

v0.14.1

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• max_connections becomes optional. (Pull #​429)
• certifi is now included in the install dependancies. (Pull #​428)
• h2 is now strictly optional. (Pull #​428)

v0.14.0

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The 0.14 release is a complete reworking of httpcore, comprehensively addressing some underlying issues in the connection pooling, as well as substantially redesigning the API to be more user friendly.

Some of the lower-level API design also makes the components more easily testable in isolation, and the package now has 100% test coverage.

See discussion #​419 for a little more background.

There's some other neat bits in there too, such as the "trace" extension, which gives a hook into inspecting the internal events that occur during the request/response cycle. This extension is needed for the HTTPX cli, in order to...

• Log the point at which the connection is established, and the IP/port on which it is made.
• Determine if the outgoing request should log as HTTP/1.1 or HTTP/2, rather than having to assume it's HTTP/2 if the --http2 flag was passed. (Which may not actually be true.)
• Log SSL version info / certificate info.

Note that curio support is not currently available in 0.14.0. If you're using httpcore with curio please get in touch, so we can assess if we ought to prioritize it as a feature or not.

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