HTTPX - A next-generation HTTP client for Python.

HTTPX is a fully featured HTTP client for Python 3, which provides sync and async APIs, and support for both HTTP/1.1 and HTTP/2.

Note: HTTPX should be considered in beta. We believe we've got the public API to a stable point now, but would strongly recommend pinning your dependencies to the 0.17.* release, so that you're able to properly review API changes between package updates. A 1.0 release is expected to be issued sometime in 2021.

---

Let's get started...

>>> import httpx
>>> r = httpx.get('https://www.example.org/')
>>> r

>>> r.status_code
200
>>> r.headers['content-type']
'text/html; charset=UTF-8'
>>> r.text
'\n\n\n<title>Example Domain</title>...'

Or, using the async API...

Use IPython or Python 3.8+ with python -m asyncio to try this code interactively.

>>> import httpx
>>> async with httpx.AsyncClient() as client:
...     r = await client.get('https://www.example.org/')
...
>>> r

Features

HTTPX builds on the well-established usability of requests, and gives you:

• A broadly requests-compatible API.
• Standard synchronous interface, but with async support if you need it.
• HTTP/1.1 and HTTP/2 support.
• Ability to make requests directly to WSGI applications or ASGI applications.
• Strict timeouts everywhere.
• Fully type annotated.
• 100% test coverage.

Plus all the standard features of requests...

• International Domains and URLs
• Keep-Alive & Connection Pooling
• Sessions with Cookie Persistence
• Browser-style SSL Verification
• Basic/Digest Authentication
• Elegant Key/Value Cookies
• Automatic Decompression
• Automatic Content Decoding
• Unicode Response Bodies
• Multipart File Uploads
• HTTP(S) Proxy Support
• Connection Timeouts
• Streaming Downloads
• .netrc Support
• Chunked Requests

Installation

Install with pip:

$ pip install httpx

Or, to include the optional HTTP/2 support, use:

$ pip install httpx[http2]

HTTPX requires Python 3.6+.

Documentation

Project documentation is available at https://www.python-httpx.org/.

For a run-through of all the basics, head over to the QuickStart.

For more advanced topics, see the Advanced Usage section, the async support section, or the HTTP/2 section.

The Developer Interface provides a comprehensive API reference.

To find out about tools that integrate with HTTPX, see Third Party Packages.

Contribute

If you want to contribute with HTTPX check out the Contributing Guide to learn how to start.

Dependencies

The HTTPX project relies on these excellent libraries:

• httpcore - The underlying transport implementation for httpx.
  • h11 - HTTP/1.1 support.
  • h2 - HTTP/2 support. (Optional)
• certifi - SSL certificates.
• rfc3986 - URL parsing & normalization.
  • idna - Internationalized domain name support.
• sniffio - Async library autodetection.
• brotlipy - Decoding for "brotli" compressed responses. (Optional)

A huge amount of credit is due to requests for the API layout that much of this work follows, as well as to urllib3 for plenty of design inspiration around the lower-level networking details.

— ⭐️ —

HTTPX is BSD licensed code. Designed & built in Brighton, England.

Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog.

0.17.0

Added

• Add httpx.MockTransport(), allowing to mock out a transport using pre-determined responses. (Pull #1401, Pull #1449)
• Add httpx.HTTPTransport() and httpx.AsyncHTTPTransport() default transports. (Pull #1399)
• Add mount API support, using httpx.Client(mounts=...). (Pull #1362)
• Add chunk_size parameter to iter_raw(), iter_bytes(), iter_text(). (Pull #1277)
• Add keepalive_expiry parameter to httpx.Limits() configuration. (Pull #1398)
• Add repr to httpx.Cookies to display available cookies. (Pull #1411)
• Add support for params= (previously only params= was supported). (Pull #1426)

Fixed

• Add missing raw_path to ASGI scope. (Pull #1357)
• Tweak create_ssl_context defaults to use trust_env=True. (Pull #1447)
• Properly URL-escape WSGI PATH_INFO. (Pull #1391)
• Properly set default ports in WSGI transport. (Pull #1469)
• Properly encode slashes when using base_url. (Pull #1407)
• Properly map exceptions in request.aclose(). (Pull #1465)

0.16.1 (October 8th, 2020)

Fixed

• Support literal IPv6 addresses in URLs. (Pull #1349)
• Force lowercase headers in ASGI scope dictionaries. (Pull #1351)

0.16.0 (October 6th, 2020)

Changed

• Preserve HTTP header casing. (Pull #1338, encode/httpcore#216, python-hyper/h11#104)
• Drop response.next() and response.anext() methods in favour of response.next_request attribute. (Pull #1339)
• Closed clients now raise a runtime error if attempting to send a request. (Pull #1346)

Added

• Add Python 3.9 to officially supported versions.
• Type annotate __enter__/__exit__/__aenter__/__aexit__ in a way that supports subclasses of Client and AsyncClient. (Pull #1336)

0.15.5 (October 1st, 2020)

Added

• Add response.next_request (Pull #1334)

0.15.4 (September 25th, 2020)

Added

• Support direct comparisons between Headers and dicts or lists of two-tuples. Eg. assert response.headers == {"Content-Length": 24} (Pull #1326)

Fixed

• Fix automatic .read() when Response instances are created with content= (Pull #1324)

0.15.3 (September 24th, 2020)

Fixed

• Fixed connection leak in async client due to improper closing of response streams. (Pull #1316)

0.15.2 (September 23nd, 2020)

Fixed

• Fixed response.elapsed property. (Pull #1313)
• Fixed client authentication interaction with .stream(). (Pull #1312)

0.15.1 (September 23nd, 2020)

Fixed

• ASGITransport now properly applies URL decoding to the path component, as-per the ASGI spec. (Pull #1307)

0.15.0 (September 22nd, 2020)

Added

• Added support for curio. (Pull https://github.com/encode/httpcore/pull/168)
• Added support for event hooks. (Pull #1246)
• Added support for authentication flows which require either sync or async I/O. (Pull #1217)
• Added support for monitoring download progress with response.num_bytes_downloaded. (Pull #1268)
• Added Request(content=...) for byte content, instead of overloading Request(data=...) (Pull #1266)
• Added support for all URL components as parameter names when using url.copy_with(...). (Pull #1285)
• Neater split between automatically populated headers on Request instances, vs default client.headers. (Pull #1248)
• Unclosed AsyncClient instances will now raise warnings if garbage collected. (Pull #1197)
• Support Response(content=..., text=..., html=..., json=...) for creating usable response instances in code. (Pull #1265, #1297)
• Support instantiating requests from the low-level transport API. (Pull #1293)
• Raise errors on invalid URL types. (Pull #1259)

Changed

• Cleaned up expected behaviour for URL escaping. url.path is now URL escaped. (Pull #1285)
• Cleaned up expected behaviour for bytes vs str in URL components. url.userinfo and url.query are not URL escaped, and so return bytes. (Pull #1285)
• Drop url.authority property in favour of url.netloc, since "authority" was semantically incorrect. (Pull #1285)
• Drop url.full_path property in favour of url.raw_path, for better consistency with other parts of the API. (Pull #1285)
• No longer use the chardet library for auto-detecting charsets, instead defaulting to a simpler approach when no charset is specified. (#1269)

Fixed

• Swapped ordering of redirects and authentication flow. (Pull #1267)
• .netrc lookups should use host, not host+port. (Pull #1298)

Removed

• The URLLib3Transport class no longer exists. We've published it instead as an example of a custom transport class. (Pull #1182)
• Drop request.timer attribute, which was being used internally to set response.elapsed. (Pull #1249)
• Drop response.decoder attribute, which was being used internally. (Pull #1276)
• Request.prepare() is now a private method. (Pull #1284)
• The Headers.getlist() method had previously been deprecated in favour of Headers.get_list(). It is now fully removed.
• The QueryParams.getlist() method had previously been deprecated in favour of QueryParams.get_list(). It is now fully removed.
• The URL.is_ssl property had previously been deprecated in favour of URL.scheme == "https". It is now fully removed.
• The httpx.PoolLimits class had previously been deprecated in favour of httpx.Limits. It is now fully removed.
• The max_keepalive setting had previously been deprecated in favour of the more explicit max_keepalive_connections. It is now fully removed.
• The verbose httpx.Timeout(5.0, connect_timeout=60.0) style had previously been deprecated in favour of httpx.Timeout(5.0, connect=60.0). It is now fully removed.
• Support for instantiating a timeout config missing some defaults, such as httpx.Timeout(connect=60.0), had previously been deprecated in favour of enforcing a more explicit style, such as httpx.Timeout(5.0, connect=60.0). This is now strictly enforced.

0.14.3 (September 2nd, 2020)

Added

• http.Response() may now be instantiated without a request=... parameter. Useful for some unit testing cases. (Pull #1238)
• Add 103 Early Hints and 425 Too Early status codes. (Pull #1244)

Fixed

• DigestAuth now handles responses that include multiple 'WWW-Authenticate' headers. (Pull #1240)
• Call into transport __enter__/__exit__ or __aenter__/__aexit__ when client is used in a context manager style. (Pull #1218)

0.14.2 (August 24th, 2020)

Added

• Support client.get(..., auth=None) to bypass the default authentication on a clients. (Pull #1115)
• Support client.auth = ... property setter. (Pull #1185)
• Support httpx.get(..., proxies=...) on top-level request functions. (Pull #1198)
• Display instances with nicer import styles. (Eg. ) (Pull #1155)
• Support cookies=[(key, value)] list-of-two-tuples style usage. (Pull #1211)

Fixed

• Ensure that automatically included headers on a request may be modified. (Pull #1205)
• Allow explicit Content-Length header on streaming requests. (Pull #1170)
• Handle URL quoted usernames and passwords properly. (Pull #1159)
• Use more consistent default for HEAD requests, setting allow_redirects=True. (Pull #1183)
• If a transport error occurs while streaming the response, raise an httpx exception, not the underlying httpcore exception. (Pull #1190)
• Include the underlying httpcore traceback, when transport exceptions occur. (Pull #1199)

0.14.1 (August 11th, 2020)

Added

• The httpx.URL(...) class now raises httpx.InvalidURL on invalid URLs, rather than exposing the underlying rfc3986 exception. If a redirect response includes an invalid 'Location' header, then a RemoteProtocolError exception is raised, which will be associated with the request that caused it. (Pull #1163)

Fixed

• Handling multiple Set-Cookie headers became broken in the 0.14.0 release, and is now resolved. (Pull #1156)

0.14.0 (August 7th, 2020)

The 0.14 release includes a range of improvements to the public API, intended on preparing for our upcoming 1.0 release.

• Our HTTP/2 support is now fully optional. You now need to use pip install httpx[http2] if you want to include the HTTP/2 dependancies.
• Our HSTS support has now been removed. Rewriting URLs from http to https if the host is on the HSTS list can be beneficial in avoiding roundtrips to incorrectly formed URLs, but on balance we've decided to remove this feature, on the principle of least surprise. Most programmatic clients do not include HSTS support, and for now we're opting to remove our support for it.
• Our exception hierarchy has been overhauled. Most users will want to stick with their existing httpx.HTTPError usage, but we've got a clearer overall structure now. See https://www.python-httpx.org/exceptions/ for more details.

When upgrading you should be aware of the following public API changes. Note that deprecated usages will currently continue to function, but will issue warnings.

• You should now use httpx.codes consistently instead of httpx.StatusCodes.
• Usage of httpx.Timeout() should now always include an explicit default. Eg. httpx.Timeout(None, pool=5.0).
• When using httpx.Timeout(), we now have more concisely named keyword arguments. Eg. read=5.0, instead of read_timeout=5.0.
• Use httpx.Limits() instead of httpx.PoolLimits(), and limits=... instead of pool_limits=....
• The httpx.Limits(max_keepalive=...) argument is now deprecated in favour of a more explicit httpx.Limits(max_keepalive_connections=...).
• Keys used with Client(proxies={...}) should now be in the style of {"http://": ...}, rather than {"http": ...}.
• The multidict methods Headers.getlist() and QueryParams.getlist() are deprecated in favour of more consistent .get_list() variants.
• The URL.is_ssl property is deprecated in favour of URL.scheme == "https".
• The URL.join(relative_url=...) method is now URL.join(url=...). This change does not support warnings for the deprecated usage style.

One notable aspect of the 0.14.0 release is that it tightens up the public API for httpx, by ensuring that several internal attributes and methods have now become strictly private.

The following previously had nominally public names on the client, but were all undocumented and intended solely for internal usage. They are all now replaced with underscored names, and should not be relied on or accessed.

These changes should not affect users who have been working from the httpx documentation.

• .merge_url(), .merge_headers(), .merge_cookies(), .merge_queryparams()
• .build_auth(), .build_redirect_request()
• .redirect_method(), .redirect_url(), .redirect_headers(), .redirect_stream()
• .send_handling_redirects(), .send_handling_auth(), .send_single_request()
• .init_transport(), .init_proxy_transport()
• .proxies, .transport, .netrc, .get_proxy_map()

See pull requests #997, #1065, #1071.

Some areas of API which were already on the deprecation path, and were raising warnings or errors in 0.13.x have now been escalated to being fully removed.

• Drop ASGIDispatch, WSGIDispatch, which have been replaced by ASGITransport, WSGITransport.
• Drop dispatch=...`` on client, which has been replaced by transport=...``
• Drop soft_limit, hard_limit, which have been replaced by max_keepalive and max_connections.
• Drop Response.stream and Response.raw, which have been replaced by ``.aiter_bytes and .aiter_raw.
• Drop proxies= in favor of proxies=httpx.Proxy(...).

See pull requests #1057, #1058.

Added

• Added dedicated exception class httpx.HTTPStatusError for .raise_for_status() exceptions. (Pull #1072)
• Added httpx.create_ssl_context() helper function. (Pull #996)
• Support for proxy exlcusions like proxies={"https://www.example.com": None}. (Pull #1099)
• Support QueryParams(None) and client.params = None. (Pull #1060)

Changed

• Use httpx.codes consistently in favour of httpx.StatusCodes which is placed into deprecation. (Pull #1088)
• Usage of httpx.Timeout() should now always include an explicit default. Eg. httpx.Timeout(None, pool=5.0). (Pull #1085)
• Switch to more concise httpx.Timeout() keyword arguments. Eg. read=5.0, instead of read_timeout=5.0. (Pull #1111)
• Use httpx.Limits() instead of httpx.PoolLimits(), and limits=... instead of pool_limits=.... (Pull #1113)
• Keys used with Client(proxies={...}) should now be in the style of {"http://": ...}, rather than {"http": ...}. (Pull #1127)
• The multidict methods Headers.getlist and QueryParams.getlist are deprecated in favour of more consistent .get_list() variants. (Pull #1089)
• URL.port becomes Optional[int]. Now only returns a port if one is explicitly included in the URL string. (Pull #1080)
• The URL(..., allow_relative=[bool]) parameter no longer exists. All URL instances may be relative. (Pull #1073)
• Drop unnecessary url.full_path = ... property setter. (Pull #1069)
• The URL.join(relative_url=...) method is now URL.join(url=...). (Pull #1129)
• The URL.is_ssl property is deprecated in favour of URL.scheme == "https". (Pull #1128)

Fixed

• Add missing Response.next() method. (Pull #1055)
• Ensure all exception classes are exposed as public API. (Pull #1045)
• Support multiple items with an identical field name in multipart encodings. (Pull #777)
• Skip HSTS preloading on single-label domains. (Pull #1074)
• Fixes for Response.iter_lines(). (Pull #1033, #1075)
• Ignore permission errors when accessing .netrc files. (Pull #1104)
• Allow bare hostnames in HTTP_PROXY etc... environment variables. (Pull #1120)
• Settings app=... or transport=... bypasses any environment based proxy defaults. (Pull #1122)
• Fix handling of .base_url when a path component is included in the base URL. (Pull #1130)

---

0.13.3 (May 29th, 2020)

Fixed

• Include missing keepalive expiry configuration. (Pull #1005)
• Improved error message when URL redirect has a custom scheme. (Pull #1002)

0.13.2 (May 27th, 2020)

Fixed

• Include explicit "Content-Length: 0" on POST, PUT, PATCH if no request body is used. (Pull #995)
• Add http2 option to httpx.Client. (Pull #982)
• Tighten up API typing in places. (Pull #992, #999)

0.13.1 (May 22nd, 2020)

Fixed

• Fix pool options deprecation warning. (Pull #980)
• Include httpx.URLLib3ProxyTransport in top-level API. (Pull #979)

0.13.0 (May 22nd, 2020)

This release switches to httpcore for all the internal networking, which means:

• We're using the same codebase for both our sync and async clients.
• HTTP/2 support is now available with the sync client.
• We no longer have a urllib3 dependency for our sync client, although there is still an optional URLLib3Transport class.

It also means we've had to remove our UDS support, since maintaining that would have meant having to push back our work towards a 1.0 release, which isn't a trade-off we wanted to make.

We also now have a public "Transport API", which you can use to implement custom transport implementations against. This formalises and replaces our previously private "Dispatch API".

Changed

• Use httpcore for underlying HTTP transport. Drop urllib3 requirement. (Pull #804, #967)
• Rename pool limit options from soft_limit/hard_limit to max_keepalive/max_connections. (Pull #968)
• The previous private "Dispatch API" has now been promoted to a public "Transport API". When customizing the transport use transport=.... The ASGIDispatch and WSGIDispatch class naming is deprecated in favour of ASGITransport and WSGITransport. (Pull #963)

Added

• Added URLLib3Transport class for optional urllib3 transport support. (Pull #804, #963)
• Streaming multipart uploads. (Pull #857)
• Logging via HTTPCORE_LOG_LEVEL and HTTPX_LOG_LEVEL environment variables and TRACE level logging. (Pull encode/httpcore#79)

Fixed

• Performance improvement in brotli decoder. (Pull #906)
• Proper warning level of deprecation notice in Response.stream and Response.raw. (Pull #908)
• Fix support for generator based WSGI apps. (Pull #887)
• Reuse of connections on HTTP/2 in close concurrency situations. (Pull encode/httpcore#81)
• Honor HTTP/2 max concurrent streams settings (Pull encode/httpcore#89, encode/httpcore#90)
• Fix bytes support in multipart uploads. (Pull #974)
• Improve typing support for files=.... (Pull #976)

Removed

• Dropped support for Client(uds=...) (Pull #804)

0.13.0.dev2 (May 12th, 2020)

The 0.13.0.dev2 is a pre-release version. To install it, use pip install httpx --pre.

Added

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

Fixed

• Reuse of connections on HTTP/2 in close concurrency situations. (HTTPCore Pull #81)
• When using an app= observe neater disconnect behaviour instead of sending empty body messages. (Pull #919)

0.13.0.dev1 (May 6th, 2020)

The 0.13.0.dev1 is a pre-release version. To install it, use pip install httpx --pre.

Fixed

• Passing http2 flag to proxy dispatchers. (Pull #934)
• Use httpcore v0.8.3 which addresses problems in handling of headers when using proxies.

0.13.0.dev0 (April 30th, 2020)

The 0.13.0.dev0 is a pre-release version. To install it, use pip install httpx --pre.

This release switches to httpcore for all the internal networking, which means:

• We're using the same codebase for both our sync and async clients.
• HTTP/2 support is now available with the sync client.
• We no longer have a urllib3 dependency for our sync client, although there is still an optional URLLib3Dispatcher class.

It also means we've had to remove our UDS support, since maintaining that would have meant having to push back our work towards a 1.0 release, which isn't a trade-off we wanted to make.

Changed

• Use httpcore for underlying HTTP transport. Drop urllib3 requirement. (Pull #804)

Added

• Added URLLib3Dispatcher class for optional urllib3 transport support. (Pull #804)
• Streaming multipart uploads. (Pull #857)

Fixed

• Performance improvement in brotli decoder. (Pull #906)
• Proper warning level of deprecation notice in Response.stream and Response.raw. (Pull #908)
• Fix support for generator based WSGI apps. (Pull #887)

Removed

• Dropped support for Client(uds=...) (Pull #804)

---

0.12.1 (March 19th, 2020)

Fixed

• Resolved packaging issue, where additional files were being included.

0.12.0 (March 9th, 2020)

The 0.12 release tightens up the API expectations for httpx by switching to private module names to enforce better clarity around public API.

All imports of httpx should import from the top-level package only, such as from httpx import Request, rather than importing from privately namespaced modules such as from httpx._models import Request.

Added

• Support making response body available to auth classes with .requires_response_body. (Pull #803)
• Export NetworkError exception. (Pull #814)
• Add support for NO_PROXY environment variable. (Pull #835)

Changed

• Switched to private module names. (Pull #785)
• Drop redirect looping detection and the RedirectLoop exception, instead using TooManyRedirects. (Pull #819)
• Drop backend=... parameter on AsyncClient, in favour of always autodetecting trio/asyncio. (Pull #791)

Fixed

• Support basic auth credentials in proxy URLs. (Pull #780)
• Fix httpx.Proxy(url, mode="FORWARD_ONLY") configuration. (Pull #788)
• Fallback to setting headers as UTF-8 if no encoding is specified. (Pull #820)
• Close proxy dispatches classes on client close. (Pull #826)
• Support custom cert parameters even if verify=False. (Pull #796)
• Don't support invalid dict-of-dicts form data in data=.... (Pull #811)

---

0.11.1 (January 17th, 2020)

Fixed

• Fixed usage of proxies=... on Client(). (Pull #763)
• Support both zlib and deflate style encodings on Content-Encoding: deflate. (Pull #758)
• Fix for streaming a redirect response body with allow_redirects=False. (Pull #766)
• Handle redirect with malformed Location headers missing host. (Pull #774)

0.11.0 (January 9th, 2020)

The 0.11 release reintroduces our sync support, so that httpx now supports both a standard thread-concurrency API, and an async API.

Existing async httpx users that are upgrading to 0.11 should ensure that:

• Async codebases should always use a client instance to make requests, instead of the top-level API.
• The async client is named as httpx.AsyncClient(), instead of httpx.Client().
• When instantiating proxy configurations use the httpx.Proxy() class, instead of the previous httpx.HTTPProxy(). This new configuration class works for configuring both sync and async clients.

We believe the API is now pretty much stable, and are aiming for a 1.0 release sometime on or before April 2020.

Changed

• Top level API such as httpx.get(url, ...), httpx.post(url, ...), httpx.request(method, url, ...) becomes synchronous.
• Added httpx.Client() for synchronous clients, with httpx.AsyncClient being used for async clients.
• Switched to proxies=httpx.Proxy(...) for proxy configuration.
• Network connection errors are wrapped in httpx.NetworkError, rather than exposing lower-level exception types directly.

Removed

• The request.url.origin property and httpx.Origin class are no longer available.
• The per-request cert, verify, and trust_env arguments are escalated from raising errors if used, to no longer being available. These arguments should be used on a per-client instance instead, or in the top-level API.
• The stream argument has escalated from raising an error when used, to no longer being available. Use the client.stream(...) or httpx.stream() streaming API instead.

Fixed

• Redirect loop detection matches against (method, url) rather than url. (Pull #734)

---

0.10.1 (December 31st, 2019)

Fixed

• Fix issue with concurrent connection acquiry. (Pull #700)
• Fix write error on closing HTTP/2 connections. (Pull #699)

0.10.0 (December 29th, 2019)

The 0.10.0 release makes some changes that will allow us to support both sync and async interfaces.

In particular with streaming responses the response.read() method becomes response.aread(), and the response.close() method becomes response.aclose().

If following redirects explicitly the response.next() method becomes response.anext().

Fixed

• End HTTP/2 streams immediately on no-body requests, rather than sending an empty body message. (Pull #682)
• Improve typing for Response.request: switch from Optional[Request] to Request. (Pull #666)
• Response.elapsed now reflects the entire download time. (Pull #687, #692)

Changed

• Added AsyncClient as a synonym for Client. (Pull #680)
• Switch to response.aread() for conditionally reading streaming responses. (Pull #674)
• Switch to response.aclose() and client.aclose() for explicit closing. (Pull #674, #675)
• Switch to response.anext() for resolving the next redirect response. (Pull #676)

Removed

• When using a client instance, the per-request usage of verify, cert, and trust_env have now escalated from raising a warning to raising an error. You should set these arguments on the client instead. (Pull #617)
• Removed the undocumented request.read(), since end users should not require it.

---

0.9.5 (December 20th, 2019)

Fixed

• Fix Host header and HSTS rewrites when an explicit :80 port is included in URL. (Pull #649)
• Query Params on the URL string are merged with any params=... argument. (Pull #653)
• More robust behavior when closing connections. (Pull #640)
• More robust behavior when handling HTTP/2 headers with trailing whitespace. (Pull #637)
• Allow any explicit Content-Type header to take precedence over the encoding default. (Pull #633)

0.9.4 (December 12th, 2019)

Fixed

• Added expiry to Keep-Alive connections, resolving issues with acquiring connections. (Pull #627)
• Increased flow control windows on HTTP/2, resolving download speed issues. (Pull #629)

0.9.3 (December 7th, 2019)

Fixed

• Fixed HTTP/2 with autodetection backend. (Pull #614)

0.9.2 (December 7th, 2019)

• Released due to packaging build artifact.

0.9.1 (December 6th, 2019)

• Released due to packaging build artifact.

0.9.0 (December 6th, 2019)

The 0.9 releases brings some major new features, including:

• A new streaming API.
• Autodetection of either asyncio or trio.
• Nicer timeout configuration.
• HTTP/2 support off by default, but can be enabled.

We've also removed all private types from the top-level package export.

In order to ensure you are only ever working with public API you should make sure to only import the top-level package eg. import httpx, rather than importing modules within the package.

Added

• Added concurrency backend autodetection. (Pull #585)
• Added Client(backend='trio') and Client(backend='asyncio') API. (Pull #585)
• Added response.stream_lines() API. (Pull #575)
• Added response.is_error API. (Pull #574)
• Added support for timeout=Timeout(5.0, connect_timeout=60.0) styles. (Pull #593)

Fixed

• Requests or Clients with timeout=None now correctly always disable timeouts. (Pull #592)
• Request 'Authorization' headers now have priority over .netrc authentication info. (Commit 095b691)
• Files without a filename no longer set a Content-Type in multipart data. (Commit ed94950)

Changed

• Added httpx.stream() API. Using stream=True now results in a warning. (Pull #600, #610)
• HTTP/2 support is switched to "off by default", but can be enabled explicitly. (Pull #584)
• Switched to Client(http2=True) API from Client(http_versions=["HTTP/1.1", "HTTP/2"]). (Pull #586)
• Removed all private types from the top-level package export. (Pull #608)
• The SSL configuration settings of verify, cert, and trust_env now raise warnings if used per-request when using a Client instance. They should always be set on the Client instance itself. (Pull #597)
• Use plain strings "TUNNEL_ONLY" or "FORWARD_ONLY" on the HTTPProxy proxy_mode argument. The HTTPProxyMode enum still exists, but its usage will raise warnings. (#610)
• Pool timeouts are now on the timeout configuration, not the pool limits configuration. (Pull #563)
• The timeout configuration is now named httpx.Timeout(...), not httpx.TimeoutConfig(...). The old version currently remains as a synonym for backwards compatability. (Pull #591)

---

0.8.0 (November 27, 2019)

Removed

• The synchronous API has been removed, in order to allow us to fundamentally change how we approach supporting both sync and async variants. (See #588 for more details.)

---

0.7.8 (November 17, 2019)

Added

• Add support for proxy tunnels for Python 3.6 + asyncio. (Pull #521)

0.7.7 (November 15, 2019)

Fixed

• Resolve an issue with cookies behavior on redirect requests. (Pull #529)

Added

• Add request/response DEBUG logs. (Pull #502)
• Use TRACE log level for low level info. (Pull #500)

0.7.6 (November 2, 2019)

Removed

• Drop proxies parameter from the high-level API. (Pull #485)

Fixed

• Tweak multipart files: omit null filenames, add support for str file contents. (Pull #482)
• Cache NETRC authentication per-client. (Pull #400)
• Rely on getproxies for all proxy environment variables. (Pull #470)
• Wait for the asyncio stream to close when closing a connection. (Pull #494)

0.7.5 (October 10, 2019)

Added

• Allow lists of values to be passed to params. (Pull #386)
• ASGIDispatch, WSGIDispatch are now available in the httpx.dispatch namespace. (Pull #407)
• HTTPError is now available in the httpx namespace. (Pull #421)
• Add support for start_tls() to the Trio concurrency backend. (Pull #467)

Fixed

• Username and password are no longer included in the Host header when basic authentication credentials are supplied via the URL. (Pull #417)

Removed

• The .delete() function no longer has json, data, or files parameters to match the expected semantics of the DELETE method. (Pull #408)
• Removed the trio extra. Trio support is detected automatically. (Pull #390)

0.7.4 (September 25, 2019)

Added

• Add Trio concurrency backend. (Pull #276)
• Add params parameter to Client for setting default query parameters. (Pull #372)
• Add support for SSL_CERT_FILE and SSL_CERT_DIR environment variables. (Pull #307)
• Add debug logging to calls into ASGI apps. (Pull #371)
• Add debug logging to SSL configuration. (Pull #378)

Fixed

• Fix a bug when using Client without timeouts in Python 3.6. (Pull #383)
• Propagate Client configuration to HTTP proxies. (Pull #377)

0.7.3 (September 20, 2019)

Added

• HTTP Proxy support. (Pulls #259, #353)
• Add Digest authentication. (Pull #332)
• Add .build_request() method to Client and AsyncClient. (Pull #319)
• Add .elapsed property on responses. (Pull #351)
• Add support for SSLKEYLOGFILE in Python 3.8b4+. (Pull #301)

Removed

• Drop NPN support for HTTP version negotiation. (Pull #314)

Fixed

• Fix distribution of type annotations for mypy (Pull #361).
• Set Host header when redirecting cross-origin. (Pull #321)
• Drop Content-Length headers on GET redirects. (Pull #310)
• Raise KeyError if header isn't found in Headers. (Pull #324)
• Raise NotRedirectResponse in response.next() if there is no redirection to perform. (Pull #297)
• Fix bug in calculating the HTTP/2 maximum frame size. (Pull #153)

0.7.2 (August 28, 2019)

• Enforce using httpx.AsyncioBackend for the synchronous client. (Pull #232)
• httpx.ConnectionPool will properly release a dropped connection. (Pull #230)
• Remove the raise_app_exceptions argument from Client. (Pull #238)
• DecodeError will no longer be raised for an empty body encoded with Brotli. (Pull #237)
• Added http_versions parameter to Client. (Pull #250)
• Only use HTTP/1.1 on short-lived connections like httpx.get(). (Pull #284)
• Convert Client.cookies and Client.headers when set as a property. (Pull #274)
• Setting HTTPX_DEBUG=1 enables debug logging on all requests. (Pull #277)

0.7.1 (August 18, 2019)

• Include files with source distribution to be installable. (Pull #233)

0.7.0 (August 17, 2019)

• Add the trust_env property to BaseClient. (Pull #187)
• Add the links property to BaseResponse. (Pull #211)
• Accept ssl.SSLContext instances into SSLConfig(verify=...). (Pull #215)
• Add Response.stream_text() with incremental encoding detection. (Pull #183)
• Properly updated the Host header when a redirect changes the origin. (Pull #199)
• Ignore invalid Content-Encoding headers. (Pull #196)
• Use ~/.netrc and ~/_netrc files by default when trust_env=True. (Pull #189)
• Create exception base class HTTPError with request and response properties. (Pull #162)
• Add HSTS preload list checking within BaseClient to upgrade HTTP URLs to HTTPS. (Pull #184)
• Switch IDNA encoding from IDNA 2003 to IDNA 2008. (Pull #161)
• Expose base classes for alternate concurrency backends. (Pull #178)
• Improve Multipart parameter encoding. (Pull #167)
• Add the headers proeprty to BaseClient. (Pull #159)
• Add support for Google's brotli library. (Pull #156)
• Remove deprecated TLS versions (TLSv1 and TLSv1.1) from default SSLConfig. (Pull #155)
• Fix URL.join(...) to work similarly to RFC 3986 URL joining. (Pull #144)

---

0.6.8 (July 25, 2019)

• Check for disconnections when searching for an available connection in ConnectionPool.keepalive_connections (Pull #145)
• Allow string comparison for URL objects (Pull #139)
• Add HTTP status codes 418 and 451 (Pull #135)
• Add support for client certificate passwords (Pull #118)
• Enable post-handshake client cert authentication for TLSv1.3 (Pull #118)
• Disable using commonName for hostname checking for OpenSSL 1.1.0+ (Pull #118)
• Detect encoding for Response.json() (Pull #116)

0.6.7 (July 8, 2019)

• Check for connection aliveness on re-acquiry (Pull #111)

0.6.6 (July 3, 2019)

• Improve USER_AGENT (Pull #110)
• Add Connection: keep-alive by default to HTTP/1.1 connections. (Pull #110)

0.6.5 (June 27, 2019)

• Include Host header by default. (Pull #109)
• Improve HTTP protocol detection. (Pull #107)

0.6.4 (June 25, 2019)

• Implement read and write timeouts (Pull #104)

0.6.3 (June 24, 2019)

• Handle early connection closes (Pull #103)

0.6.2 (June 23, 2019)

• Use urllib3's DEFAULT_CIPHERS for the SSLConfig object. (Pull #100)

0.6.1 (June 21, 2019)

• Add support for setting a base_url on the Client.

0.6.0 (June 21, 2019)

• Honor local_flow_control_window for HTTP/2 connections (Pull #98)