bpo-32021: Support brotli .br encoding in mimetypes

[philmcmahon]

Currently python mimetypes does not support the brotli file extension. Brotli has decent browser support at this point.

My particular use case for this is that I would like the AWS S3 CLI to automatically set the Content-Type and Content-Encoding headers on brotli files uploaded to it - so for example a file script.js.br would have Content-Type: 'application/javascript' and Content-Encoding br. This relies on mimetypes.

https://bugs.python.org/issue32021

[the-knights-who-say-ni]

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[ned-deily]

@bitdancer, @warsaw Any reason you can think of to not merge this?

[maxking]

It looks like .br is now an officially recognized content-encoding as per https://www.iana.org/assignments/http-parameters/http-parameters.xhtml#content-coding, so I think we should get this merged.

[maxking]

LGTM

[bedevere-bot]

@maxking: Please replace # with GH- in the commit message next time. Thanks!

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot x86 Gentoo Installed with X 3.x has failed when building commit b2b4a51.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/all/#builders/128/builds/133) and take a look at the build logs.
4. Check if the failure is related to this commit (b2b4a51) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/all/#builders/128/builds/133

Failed tests:

• test_smtpnet

Failed subtests:

• test_connect_starttls - test.test_smtpnet.SmtpTest
• test_connect - test.test_smtpnet.SmtpSSLTest
• test_connect_using_sslcontext - test.test_smtpnet.SmtpSSLTest

Summary of the results of the build (if available):

== Tests result: FAILURE then FAILURE ==

406 tests OK.

1 test failed:
test_smtpnet

13 tests skipped:
test_asdl_parser test_check_c_globals test_clinic test_devpoll
test_gdb test_ioctl test_kqueue test_msilib test_startfile
test_winconsoleio test_winreg test_winsound test_zipfile64

1 re-run test:
test_smtpnet

Total duration: 31 min 50 sec

Click to see traceback logs

Traceback (most recent call last):
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/test/test_smtpnet.py", line 68, in test_connect_using_sslcontext
    server = smtplib.SMTP_SSL(self.testServer, self.remotePort, context=context)
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 1032, in __init__
    SMTP.__init__(self, host, port, local_hostname, timeout,
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 253, in __init__
    (code, msg) = self.connect(host, port)
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 339, in connect
    (code, msg) = self.getreply()
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 396, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
smtplib.SMTPServerDisconnected: Connection unexpectedly closed


Traceback (most recent call last):
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/test/test_smtpnet.py", line 51, in test_connect
    server = smtplib.SMTP_SSL(self.testServer, self.remotePort)
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 1032, in __init__
    SMTP.__init__(self, host, port, local_hostname, timeout,
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 253, in __init__
    (code, msg) = self.connect(host, port)
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 339, in connect
    (code, msg) = self.getreply()
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 396, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
smtplib.SMTPServerDisconnected: Connection unexpectedly closed


Traceback (most recent call last):
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/test/test_smtpnet.py", line 34, in test_connect_starttls
    server.starttls(context=context)
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/smtplib.py", line 772, in starttls
    self.sock = context.wrap_socket(self.sock,
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/ssl.py", line 500, in wrap_socket
    return self.sslsocket_class._create(
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/ssl.py", line 1040, in _create
    self.do_handshake()
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/ssl.py", line 1309, in do_handshake
    self._sslobj.do_handshake()
OSError: [Errno 0] Error