Flask Changelog

Here you can see the full list of changes between each Flask release.

Version 0.8

Relase date to be decided, codename to be chosen.

  • Refactored session support into a session interface so that the implementation of the sessions can be changed without having to override the Flask class.
  • Empty session cookies are now deleted properly automatically.
  • View functions can now opt out of getting the automatic OPTIONS implementation.
  • HTTP exceptions and Bad Request errors can now be trapped so that they show up normally in the traceback.
  • Flask in debug mode is now detecting some common problems and tries to warn you about them.
  • Flask in debug mode will now complain with an assertion error if a view was attached after the first request was handled. This gives earlier feedback when users forget to import view code ahead of time.
  • Added the ability to register callbacks that are only triggered once at the beginning of the first request. (Flask.before_first_request())
  • Malformed JSON data will now trigger a bad request HTTP exception instead of a value error which usually would result in a 500 internal server error if not handled. This is a backwards incompatible change.
  • Applications now not only have a root path where the resources and modules are located but also an instane path which is the designated place to drop files that are modified at runtime (uploads etc.). Also this is conceptionally only instance depending and outside version control so it’s the perfect place to put configuration files etc. For more information see instance-folders.
  • Added the APPLICATION_ROOT configuration variable.
  • Implemented session_transaction() to easily modify sessions from the test environment.
  • Refactored test client internally. The APPLICATION_ROOT configuration variable as well as SERVER_NAME are now properly used by the test client as defaults.
  • Added flask.views.View.decorators to support simpler decorating of pluggable (class based) views.
  • Fixed an issue where the test client if used with the with statement did not trigger the execution of the teardown handlers.
  • Added finer control over the session cookie parameters.
  • HEAD requests to a method view now automatically dispatch to the get method if no handler was implemented.
  • Implemented the virtual flask.ext package to import extensions from.
  • The context preservation on exceptions is now an integral component of Flask itself and no longer of the test client. This cleaned up some internal logic and lowers the odds of runaway request contexts in unittests.

Version 0.7.3

Bugfix release, release date to be decided

  • Fixed the Jinja2 environment’s list_templates method not returning the correct names when blueprints or modules were involved.

Version 0.7.2

Bugfix release, released on July 6th 2011

  • Fixed an issue with URL processors not properly working on blueprints.

Version 0.7.1

Bugfix release, released on June 29th 2011

  • Added missing future import that broke 2.5 compatibility.
  • Fixed an infinite redirect issue with blueprints.

Version 0.7

Released on June 28th 2011, codename Grappa

  • Added make_default_options_response() which can be used by subclasses to alter the default behaviour for OPTIONS responses.
  • Unbound locals now raise a proper RuntimeError instead of an AttributeError.
  • Mimetype guessing and etag support based on file objects is now deprecated for flask.send_file() because it was unreliable. Pass filenames instead or attach your own etags and provide a proper mimetype by hand.
  • Static file handling for modules now requires the name of the static folder to be supplied explicitly. The previous autodetection was not reliable and caused issues on Google’s App Engine. Until 1.0 the old behaviour will continue to work but issue dependency warnings.
  • fixed a problem for Flask to run on jython.
  • added a PROPAGATE_EXCEPTIONS configuration variable that can be used to flip the setting of exception propagation which previously was linked to DEBUG alone and is now linked to either DEBUG or TESTING.
  • Flask no longer internally depends on rules being added through the add_url_rule function and can now also accept regular werkzeug rules added to the url map.
  • Added an endpoint method to the flask application object which allows one to register a callback to an arbitrary endpoint with a decorator.
  • Use Last-Modified for static file sending instead of Date which was incorrectly introduced in 0.6.
  • Added create_jinja_loader to override the loader creation process.
  • Implemented a silent flag for config.from_pyfile.
  • Added teardown_request decorator, for functions that should run at the end of a request regardless of whether an exception occurred. Also the behavior for after_request was changed. It’s now no longer executed when an exception is raised. See Upgrading to new Teardown Handling
  • Implemented flask.has_request_context()
  • Deprecated init_jinja_globals. Override the create_jinja_environment() method instead to achieve the same functionality.
  • Added flask.safe_join()
  • The automatic JSON request data unpacking now looks at the charset mimetype parameter.
  • Don’t modify the session on flask.get_flashed_messages() if there are no messages in the session.
  • before_request handlers are now able to abort requests with errors.
  • it is not possible to define user exception handlers. That way you can provide custom error messages from a central hub for certain errors that might occur during request processing (for instance database connection errors, timeouts from remote resources etc.).
  • Blueprints can provide blueprint specific error handlers.
  • Implemented generic Pluggable Views (class based views).

Version 0.6.1

Bugfix release, released on December 31st 2010

  • Fixed an issue where the default OPTIONS response was not exposing all valid methods in the Allow header.
  • Jinja2 template loading syntax now allows ”./” in front of a template load path. Previously this caused issues with module setups.
  • Fixed an issue where the subdomain setting for modules was ignored for the static folder.
  • Fixed a security problem that allowed clients to download arbitrary files if the host server was a windows based operating system and the client uses backslashes to escape the directory the files where exposed from.

Version 0.6

Released on July 27th 2010, codename Whisky

  • after request functions are now called in reverse order of registration.
  • OPTIONS is now automatically implemented by Flask unless the application explicitly adds ‘OPTIONS’ as method to the URL rule. In this case no automatic OPTIONS handling kicks in.
  • static rules are now even in place if there is no static folder for the module. This was implemented to aid GAE which will remove the static folder if it’s part of a mapping in the .yml file.
  • the config is now available in the templates as config.
  • context processors will no longer override values passed directly to the render function.
  • added the ability to limit the incoming request data with the new MAX_CONTENT_LENGTH configuration value.
  • the endpoint for the flask.Module.add_url_rule() method is now optional to be consistent with the function of the same name on the application object.
  • added a flask.make_response() function that simplifies creating response object instances in views.
  • added signalling support based on blinker. This feature is currently optional and supposed to be used by extensions and applications. If you want to use it, make sure to have blinker installed.
  • refactored the way URL adapters are created. This process is now fully customizable with the create_url_adapter() method.
  • modules can now register for a subdomain instead of just an URL prefix. This makes it possible to bind a whole module to a configurable subdomain.

Version 0.5.2

Bugfix Release, released on July 15th 2010

  • fixed another issue with loading templates from directories when modules were used.

Version 0.5.1

Bugfix Release, released on July 6th 2010

  • fixes an issue with template loading from directories when modules where used.

Version 0.5

Released on July 6th 2010, codename Calvados

  • fixed a bug with subdomains that was caused by the inability to specify the server name. The server name can now be set with the SERVER_NAME config key. This key is now also used to set the session cookie cross-subdomain wide.
  • autoescaping is no longer active for all templates. Instead it is only active for .html, .htm, .xml and .xhtml. Inside templates this behaviour can be changed with the autoescape tag.
  • refactored Flask internally. It now consists of more than a single file.
  • flask.send_file() now emits etags and has the ability to do conditional responses builtin.
  • (temporarily) dropped support for zipped applications. This was a rarely used feature and led to some confusing behaviour.
  • added support for per-package template and static-file directories.
  • removed support for create_jinja_loader which is no longer used in 0.5 due to the improved module support.
  • added a helper function to expose files from any directory.

Version 0.4

Released on June 18th 2010, codename Rakia

  • added the ability to register application wide error handlers from modules.
  • after_request() handlers are now also invoked if the request dies with an exception and an error handling page kicks in.
  • test client has not the ability to preserve the request context for a little longer. This can also be used to trigger custom requests that do not pop the request stack for testing.
  • because the Python standard library caches loggers, the name of the logger is configurable now to better support unittests.
  • added TESTING switch that can activate unittesting helpers.
  • the logger switches to DEBUG mode now if debug is enabled.

Version 0.3.1

Bugfix release, released on May 28th 2010

  • fixed a error reporting bug with flask.Config.from_envvar()
  • removed some unused code from flask
  • release does no longer include development leftover files (.git folder for themes, built documentation in zip and pdf file and some .pyc files)

Version 0.3

Released on May 28th 2010, codename Schnaps

  • added support for categories for flashed messages.
  • the application now configures a logging.Handler and will log request handling exceptions to that logger when not in debug mode. This makes it possible to receive mails on server errors for example.
  • added support for context binding that does not require the use of the with statement for playing in the console.
  • the request context is now available within the with statement making it possible to further push the request context or pop it.
  • added support for configurations.

Version 0.2

Released on May 12th 2010, codename Jägermeister

  • various bugfixes
  • integrated JSON support
  • added get_template_attribute() helper function.
  • add_url_rule() can now also register a view function.
  • refactored internal request dispatching.
  • server listens on by default now to fix issues with chrome.
  • added external URL support.
  • added support for send_file()
  • module support and internal request handling refactoring to better support pluggable applications.
  • sessions can be set to be permanent now on a per-session basis.
  • better error reporting on missing secret keys.
  • added support for Google Appengine.

Version 0.1

First public preview release.