Bugfix release

• Proactively refresh credentials when applying and treat a missing
  access_token as invalid. Note: This change reveals surprising behavior
  between default credentials and batches. If you allow
  googleapiclient.discovery.build to use default credentials and specify
  different credentials by providing batch.execut() with an explicit http
  argument, your individual requests will use the default credentials and
  not the credentials specified to the batch http. To avoid this, tell
  build explicitly not to use default credentials by specifying
  build(..., http=httplib2.Http(). (#469)
• Remove mutual exclusivity check for developerKey and credentials (#465)
• Handle unknown media length. (#406)
• Handle variant error format gracefully. (#459)
• Avoid testing against Django >= 2.0.0 on Python 2. (#460)

Bugfix release

• Warn when google-auth credentials are used but google-auth-httplib2 isn't available. (#443)

Version 1.6.3

Bugfix release

• Add notification of maintenance mode to README. (#410)
• Fix generation of methods with abnormal page token conventions. (#338)
• Raise ValueError is credentials and developerKey are both specified. (#358)
• Re-generate documentation. (#364, #373, #401)
• Fix method signature documentation for multiline required parameters. (#374)
• Fix ZeroDivisionError in MediaDownloadProgress.progress. (#377)
• Fix dead link to WebTest in README. (#378)
• Fix details missing in googleapiclient.errors.HttpError. (#412)
• Don't treat httplib2.Credentials as oauth credentials. (#425)
• Various fixes to the Django sample. (#413)

Version 1.6.2

Bugfix release

• Fixed a bug where application default credentials would still be used even
  when a developerKey was specified. (#347)
• Official support for Python 3.5 and 3.6. (#341)

v1.6.1
Version 1.6.1

Bugfix release

• Fixed a bug where using google-auth with scoped credentials would fail. (#328)

v1.6.0
Version 1.6.0

Release to drop support for Python 2.6 and add support for google-auth.

• Support for Python 2.6 has been dropped. (#319)
• The credentials argument to discovery.build and discovery.build_from_document
  can be either oauth2client credentials or google-auth credentials. (#319)
• discovery.build and discovery.build_from_document now unambiguously use the
  http argument to make all requests, including the request for the discovery
  document. (#319)
• The http and credentials arguments to discovery.build and
  discovery.build_from_document are now mutually exclusive, eliminating a
  buggy edge case. (#319)
• If neither http or credentials is specified to discovery.build and
  discovery.build_from_document, then Application Default Credentials will
  be used. The library prefers google-auth for this if it is available, but
  can also use oauth2client's implementation. (#319)
• Fixed resumable upload failure when receiving a 308 response. (#312)
• Clarified the support versions of Python 3. (#316)

Version 1.5.5

Bugfix release

• Allow explicit MIME type specification with media_mime_type keyword argument.
• Fix unprintable representation of BatchError with default constructor. (#165)
• Refresh all discovery docs, not just the preferred ones. (#298)
• Update minimum httplib2 dependency to >=0.9.2.

Version 1.5.4

Bugfix release

• Properly handle errors when the API returns a mapping or sequence. (#289)
• Upgrade to unified uritemplate 3.0.0. (#293)
• Allow oauth2client 4.0.0, with the caveat that file-based discovery
  caching is disabled.

Version 1.5.2

Bugfix release

• Allow using oauth2client >= 1.5.0, < 4.0.0. (#265)
• Fix project_id argument description. (#257)
• Retry chunk uploaded on rate limit exceeded errors. (#255)
• Obtain access token if necessary in BatchHttpRequest.execute(). (#232)
• Warn when running tests using HttpMock without having a cache. (#261)

Version 1.5.1

Bugfix release

• Allow using versions of oauth2client < 2.0.0. (#197)
• Check both current and new API discovery URL. (#202)
• Retry http requests on connection errors and timeouts. (#218)
• Retry http requests on rate limit responses. (#201)
• Import guards for ssl (for Google App Engine). (#220)
• Use named loggers instead of the root logger. (#206)
• New search console example. (#212)