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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
httpcore	==0.3.0 -> ==0.18.0

---

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.

v0.13.7

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• Fix broken error messaging when URL scheme is missing, or a non HTTP(S) scheme is used. (Pull #​403)

v0.13.6

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Fixed

• Close sockets when read or write timeouts occur. (Pull #​365)

v0.13.5

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Fixed

• Resolved niggles with AnyIO EOF behaviours. (Pull #​358, #​362)

v0.13.4

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Added

• Improved error messaging when URL scheme is missing, or a non HTTP(S) scheme is used. (Pull #​354)

Fixed

• Switched to anyio as the default backend implementation when running with asyncio. Resolves some awkward TLS timeout issues.

v0.13.3

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Added

• Support HTTP/2 prior knowledge, using httpcore.SyncConnectionPool(http1=False). (Pull #​333)

Fixed

• Handle cases where environment does not provide select.poll support. (Pull #​331)

v0.13.2

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Added

• Improve error message for specific case of RemoteProtocolError where server disconnects without sending a response. (Pull #​313)

v0.13.1

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Fixed

• More resiliant testing for closed connections. (Pull #​311)
• Don't raise exceptions on ungraceful connection closes. (Pull #​310)

v0.13.0

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The 0.13 release updates the core API in order to match the HTTPX Transport API,
introduced in HTTPX 0.18 onwards.

An example of making requests with the new interface is:

with httpcore.SyncConnectionPool() as http:
    status_code, headers, stream, extensions = http.handle_request(
        method=b'GET',
        url=(b'https', b'example.org', 443, b'/'),
        headers=[(b'host', b'example.org'), (b'user-agent', b'httpcore')]
        stream=httpcore.ByteStream(b''),
        extensions={}
    )
    body = stream.read()
    print(status_code, body)

Changed

• The .request() method is now handle_request(). (Pull #​296)
• The .arequest() method is now .handle_async_request(). (Pull #​296)
• The headers argument is no longer optional. (Pull #​296)
• The stream argument is no longer optional. (Pull #​296)
• The ext argument is now named extensions, and is no longer optional. (Pull #​296)
• The "reason" extension keyword is now named "reason_phrase". (Pull #​296)
• The "reason_phrase" and "http_version" extensions now use byte strings for their values. (Pull #​296)
• The httpcore.PlainByteStream() class becomes httpcore.ByteStream(). (Pull #​296)

Added

• Streams now support a .read() interface. (Pull #​296)

Fixed

• Task cancellation no longer leaks connections from the connection pool. (Pull #​305)

v0.12.3

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Fixed

• Abort SSL connections on close rather than waiting for remote EOF when using asyncio. (Pull #​167)
• Fix exception raised in case of connect timeouts when using the anyio backend. (Pull #​236)
• Fix Host header precedence for :authority in HTTP/2. (Pull #​241, #​243)
• Handle extra edge case when detecting for socket readability when using asyncio. (Pull #​242, #​244)
• Fix asyncio SSL warning when using proxy tunneling. (Pull #​249)

v0.12.2

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Fixed

• Properly wrap connect errors on the asyncio backend. (Pull #​235)
• Fix ImportError occurring on Python 3.9 when using the HTTP/1.1 sync client in a multithreaded context. (Pull #​237)

v0.12.1

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Added

• Add connect retries. (Pull #​221)

Fixed

• Tweak detection of dropped connections, resolving an issue with open files limits on Linux. (Pull #​185)
• Avoid leaking connections when establishing an HTTP tunnel to a proxy has failed. (Pull #​223)
• Properly wrap OS errors when using trio. (Pull #​225)

v0.12.0

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Changed

• HTTP header casing is now preserved, rather than always sent in lowercase. (#​216 and python-hyper/h11#104)

Added

• Add Python 3.9 to officially supported versions.

Fixed

• Gracefully handle a stdlib asyncio bug when a connection is closed while it is in a paused-for-reading state. (#​201)

v0.11.1

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Fixed

• Add await to async semaphore release() coroutine (#​197)
• Drop incorrect curio classifier (#​192)

v0.11.0

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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 https://github.com/encode/httpx/issues/1274#issuecomment-694884553 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 #​168)
• Add anyio support, with backend="anyio". (Pull #​169)

Changed

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

v0.10.2

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Added

• Added Unix Domain Socket support. (Pull #​139)

Fixed

• Always include the port on proxy CONNECT requests. (Pull #​154)
• Fix max_keepalive_connections configuration. (Pull #​153)
• Fixes behaviour in HTTP/1.1 where server disconnects can be used to signal the end of the response body. (Pull #​164)

v0.10.1

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• Include max_keepalive_connections on AsyncHTTPProxy/SyncHTTPProxy classes.

v0.10.0

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The most notable change in the 0.10.0 release is that HTTP/2 support is now fully optional.

Use either pip install httpcore for HTTP/1.1 support only, or pip install httpcore[http2] for HTTP/1.1 and HTTP/2 support.

Added

• HTTP/2 support becomes optional. (Pull #​121, #​130)
• Add local_address=... support. (Pull #​100, #​134)
• Add PlainByteStream, IteratorByteStream, AsyncIteratorByteStream. The AsyncByteSteam and SyncByteStream classes are now pure interface classes. (#​133)
• Add LocalProtocolError, RemoteProtocolError exceptions. (Pull #​129)
• Add UnsupportedProtocol exception. (Pull #​128)
• Add .get_connection_info() method. (Pull #​102, #​137)
• Add better TRACE logs. (Pull #​101)

Changed

• max_keepalive is deprecated in favour of max_keepalive_connections. (Pull #​140)

Fixed

• Improve handling of server disconnects. (Pull #​112)

v0.9.1

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Fixed

• Proper host resolution for sync case, including IPv6 support. (Pull #​97)
• Close outstanding connections when connection pool is closed. (Pull #​98)

v0.9.0

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Changed

• URL port becomes an Optional[int] instead of int. (Pull #​92)

Fixed

• Honor HTTP/2 max concurrent streams settings. (Pull #​89, #​90)
• Remove incorrect debug log. (Pull #​83)

v0.8.4

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Added

• Logging via HTTPCORE_LOG_LEVEL and HTTPX_LOG_LEVEL environment variables
  and TRACE level logging. (Pull #​79)

Fixed

• Reuse of connections on HTTP/2 in close concurrency situations. (Pull #​81)

v0.8.3

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Fixed

• Include Host and Accept headers on proxy "CONNECT" requests.
• De-duplicate any headers also contained in proxy_headers.
• HTTP/2 flag not being passed down to proxy connections.

v0.8.2

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Fixed

• Fix connections using proxy forwarding requests not being added to the
  connection pool properly. (Pull #​70)

v0.8.1

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Changed

• Allow inherintance of both httpcore.AsyncByteStream, httpcore.SyncByteStream without type conflicts.

v0.8.0

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Fixed

• Fixed tunnel proxy support.

### Added

• New TimeoutException base class.

v0.7.0

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• First integration with HTTPX.

v0.6.0

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