2.27.0 (2022-01-03)

**Improvements**

- Officially added support for Python 3.10. (#5928)

- Added a `requests.exceptions.JSONDecodeError` to unify JSON exceptions between

Python 2 and 3. This gets raised in the `response.json()` method, and is

Can be caught from `requests.exceptions.RequestException` as well. (#5856)

- Improved error text for misnamed `InvalidSchema` and `MissingSchema`

exceptions. This is a temporary fix until exceptions can be renamed

(Schema->Scheme). (#6017)

- Improved proxy parsing for proxy URLs missing a scheme. This will address

recent changes to `urlparse` in Python 3.9+. (#5917)

**Bugfixes**

- Fixed defect in `extract_zipped_paths` which could result in an infinite loop

for some paths. (#5851)

- Fixed handling for `AttributeError` when calculating length of files obtained

by `Tarfile.extractfile()`. (#5239)

- Fixed urllib3 exception leak, wrapping `urllib3.exceptions.InvalidHeader` with

`requests.exceptions.InvalidHeader`. (#5914)

- Fixed bug where two Host headers were sent for chunked requests. (#5391)

- Fixed regression in Requests 2.26.0 where `Proxy-Authorization` was

incorrectly stripped from all requests sent with `Session.send`. (#5924)

- Fixed performance regression in 2.26.0 for hosts with a large number of

proxies available in the environment. (#5924)

- Fixed idna exception leak, wrapping `UnicodeError` with

`requests.exceptions.InvalidURL` for URLs with a leading dot (.) in the

domain. (#5414)

**Deprecations**

- Requests support for Python 2.7 and 3.6 will be ending in 2022. While we

don't have exact dates, Requests 2.27.x is likely to be the last release

series providing support.