feat: Add httpx 0.20.* support

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
httpx (changelog)	>=0.15.4,<0.20.0 -> >=0.15.4,<0.20.1

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Release Notes

encode/httpx

v0.20.0

Compare Source

The 0.20.0 release adds an integrated command-line client, and also includes some
design changes. The most notable of these is that redirect responses are no longer
automatically followed, unless specifically requested.

This design decision prioritises a more explicit approach to redirects, in order
to avoid code that unintentionally issues multiple requests as a result of
misconfigured URLs.

For example, previously a client configured to send requests to http://api.github.com/
would end up sending every API request twice, as each request would be redirected to https://api.github.com/.

If you do want auto-redirect behaviour, you can enable this either by configuring
the client instance with Client(follow_redirects=True), or on a per-request
basis, with .get(..., follow_redirects=True).

This change is a classic trade-off between convenience and precision, with no "right"
answer. See discussion #​1785 for more
context.

The other major design change is an update to the Transport API, which is the low-level
interface against which requests are sent. Previously this interface used only primitive
datastructures, like so...

(status_code, headers, stream, extensions) = transport.handle_request(method, url, headers, stream, extensions)
try
    ...
finally:
    stream.close()

Now the interface is much simpler...

response = transport.handle_request(request)
try
    ...
finally:
    response.close()

Changed

• The allow_redirects flag is now follow_redirects and defaults to False.
• The raise_for_status() method will now raise an exception for any responses
  except those with 2xx status codes. Previously only 4xx and 5xx status codes
  would result in an exception.
• The low-level transport API changes to the much simpler response = transport.handle_request(request).
• The client.send() method no longer accepts a timeout=... argument, but the
  client.build_request() does. This required by the signature change of the
  Transport API. The request timeout configuration is now stored on the request
  instance, as request.extensions['timeout'].

Added

• Added the httpx command-line client.
• Response instances now include .is_informational, .is_success, .is_redirect, .is_client_error, and .is_server_error
  properties for checking 1xx, 2xx, 3xx, 4xx, and 5xx response types. Note that the behaviour of .is_redirect is slightly different in that it now returns True for all 3xx responses, in order to allow for a consistent set of properties onto the different HTTP status code types. The response.has_redirect_location location may be used to determine responses with properly formed URL redirects.

Fixed

• response.iter_bytes() no longer raises a ValueError when called on a response with no content. (Pull #​1827)
• The 'wsgi.error' configuration now defaults to sys.stderr, and is corrected to be a TextIO interface, not a BytesIO interface. Additionally, the WSGITransport now accepts a wsgi_error confguration. (Pull #​1828)
• Follow the WSGI spec by properly closing the iterable returned by the application. (Pull #​1830)

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[codecov]

Codecov Report

Merging #514 (01d886f) into main (94838ba) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main      #514   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           48        48           
  Lines         1628      1628           
=========================================
  Hits          1628      1628           

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