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  <div class="section" id="flask-changelog">
<h1>Flask Changelog<a class="headerlink" href="#flask-changelog" title="Permalink to this headline">¶</a></h1>
<p>Here you can see the full list of changes between each Flask release.</p>
<div class="section" id="version-0-9">
<h2>Version 0.9<a class="headerlink" href="#version-0-9" title="Permalink to this headline">¶</a></h2>
<p>Relase date to be decided, codename to be chosen.</p>
</div>
<div class="section" id="version-0-8">
<h2>Version 0.8<a class="headerlink" href="#version-0-8" title="Permalink to this headline">¶</a></h2>
<p>Released on September 29th 2011, codename Rakija</p>
<ul class="simple">
<li>Refactored session support into a session interface so that
the implementation of the sessions can be changed without
having to override the Flask class.</li>
<li>Empty session cookies are now deleted properly automatically.</li>
<li>View functions can now opt out of getting the automatic
OPTIONS implementation.</li>
<li>HTTP exceptions and Bad Request errors can now be trapped so that they
show up normally in the traceback.</li>
<li>Flask in debug mode is now detecting some common problems and tries to
warn you about them.</li>
<li>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.</li>
<li>Added the ability to register callbacks that are only triggered once at
the beginning of the first request. (<tt class="xref py py-meth docutils literal"><span class="pre">Flask.before_first_request()</span></tt>)</li>
<li>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.</li>
<li>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&#8217;s
the perfect place to put configuration files etc.  For more information
see <a class="reference internal" href="config.html#instance-folders"><em>Instance Folders</em></a>.</li>
<li>Added the <tt class="docutils literal"><span class="pre">APPLICATION_ROOT</span></tt> configuration variable.</li>
<li>Implemented <tt class="xref py py-meth docutils literal"><span class="pre">session_transaction()</span></tt> to
easily modify sessions from the test environment.</li>
<li>Refactored test client internally.  The <tt class="docutils literal"><span class="pre">APPLICATION_ROOT</span></tt> configuration
variable as well as <tt class="docutils literal"><span class="pre">SERVER_NAME</span></tt> are now properly used by the test client
as defaults.</li>
<li>Added <a class="reference internal" href="api.html#flask.views.View.decorators" title="flask.views.View.decorators"><tt class="xref py py-attr docutils literal"><span class="pre">flask.views.View.decorators</span></tt></a> to support simpler decorating of
pluggable (class based) views.</li>
<li>Fixed an issue where the test client if used with the with statement did not
trigger the execution of the teardown handlers.</li>
<li>Added finer control over the session cookie parameters.</li>
<li>HEAD requests to a method view now automatically dispatch to the <cite>get</cite>
method if no handler was implemented.</li>
<li>Implemented the virtual <tt class="xref py py-mod docutils literal"><span class="pre">flask.ext</span></tt> package to import extensions from.</li>
<li>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.</li>
</ul>
</div>
<div class="section" id="version-0-7-3">
<h2>Version 0.7.3<a class="headerlink" href="#version-0-7-3" title="Permalink to this headline">¶</a></h2>
<p>Bugfix release, release date to be decided</p>
<ul class="simple">
<li>Fixed the Jinja2 environment&#8217;s list_templates method not returning the
correct names when blueprints or modules were involved.</li>
</ul>
</div>
<div class="section" id="version-0-7-2">
<h2>Version 0.7.2<a class="headerlink" href="#version-0-7-2" title="Permalink to this headline">¶</a></h2>
<p>Bugfix release, released on July 6th 2011</p>
<ul class="simple">
<li>Fixed an issue with URL processors not properly working on
blueprints.</li>
</ul>
</div>
<div class="section" id="version-0-7-1">
<h2>Version 0.7.1<a class="headerlink" href="#version-0-7-1" title="Permalink to this headline">¶</a></h2>
<p>Bugfix release, released on June 29th 2011</p>
<ul class="simple">
<li>Added missing future import that broke 2.5 compatibility.</li>
<li>Fixed an infinite redirect issue with blueprints.</li>
</ul>
</div>
<div class="section" id="version-0-7">
<h2>Version 0.7<a class="headerlink" href="#version-0-7" title="Permalink to this headline">¶</a></h2>
<p>Released on June 28th 2011, codename Grappa</p>
<ul class="simple">
<li>Added <a class="reference internal" href="api.html#flask.Flask.make_default_options_response" title="flask.Flask.make_default_options_response"><tt class="xref py py-meth docutils literal"><span class="pre">make_default_options_response()</span></tt></a>
which can be used by subclasses to alter the default
behaviour for <cite>OPTIONS</cite> responses.</li>
<li>Unbound locals now raise a proper <a class="reference external" href="http://docs.python.org/dev/library/exceptions.html#RuntimeError" title="(in Python v3.3)"><tt class="xref py py-exc docutils literal"><span class="pre">RuntimeError</span></tt></a> instead
of an <a class="reference external" href="http://docs.python.org/dev/library/exceptions.html#AttributeError" title="(in Python v3.3)"><tt class="xref py py-exc docutils literal"><span class="pre">AttributeError</span></tt></a>.</li>
<li>Mimetype guessing and etag support based on file objects is now
deprecated for <a class="reference internal" href="api.html#flask.send_file" title="flask.send_file"><tt class="xref py py-func docutils literal"><span class="pre">flask.send_file()</span></tt></a> because it was unreliable.
Pass filenames instead or attach your own etags and provide a
proper mimetype by hand.</li>
<li>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&#8217;s App Engine.  Until
1.0 the old behaviour will continue to work but issue dependency
warnings.</li>
<li>fixed a problem for Flask to run on jython.</li>
<li>added a <cite>PROPAGATE_EXCEPTIONS</cite> configuration variable that can be
used to flip the setting of exception propagation which previously
was linked to <cite>DEBUG</cite> alone and is now linked to either <cite>DEBUG</cite> or
<cite>TESTING</cite>.</li>
<li>Flask no longer internally depends on rules being added through the
<cite>add_url_rule</cite> function and can now also accept regular werkzeug
rules added to the url map.</li>
<li>Added an <cite>endpoint</cite> method to the flask application object which
allows one to register a callback to an arbitrary endpoint with
a decorator.</li>
<li>Use Last-Modified for static file sending instead of Date which
was incorrectly introduced in 0.6.</li>
<li>Added <cite>create_jinja_loader</cite> to override the loader creation process.</li>
<li>Implemented a silent flag for <cite>config.from_pyfile</cite>.</li>
<li>Added <cite>teardown_request</cite> decorator, for functions that should run at the end
of a request regardless of whether an exception occurred.  Also the behavior
for <cite>after_request</cite> was changed.  It&#8217;s now no longer executed when an exception
is raised.  See <a class="reference internal" href="upgrading.html#upgrading-to-new-teardown-handling"><em>Upgrading to new Teardown Handling</em></a></li>
<li>Implemented <a class="reference internal" href="api.html#flask.has_request_context" title="flask.has_request_context"><tt class="xref py py-func docutils literal"><span class="pre">flask.has_request_context()</span></tt></a></li>
<li>Deprecated <cite>init_jinja_globals</cite>.  Override the
<a class="reference internal" href="api.html#flask.Flask.create_jinja_environment" title="flask.Flask.create_jinja_environment"><tt class="xref py py-meth docutils literal"><span class="pre">create_jinja_environment()</span></tt></a> method instead to
achieve the same functionality.</li>
<li>Added <a class="reference internal" href="api.html#flask.safe_join" title="flask.safe_join"><tt class="xref py py-func docutils literal"><span class="pre">flask.safe_join()</span></tt></a></li>
<li>The automatic JSON request data unpacking now looks at the charset
mimetype parameter.</li>
<li>Don&#8217;t modify the session on <a class="reference internal" href="api.html#flask.get_flashed_messages" title="flask.get_flashed_messages"><tt class="xref py py-func docutils literal"><span class="pre">flask.get_flashed_messages()</span></tt></a> if there
are no messages in the session.</li>
<li><cite>before_request</cite> handlers are now able to abort requests with errors.</li>
<li>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.).</li>
<li>Blueprints can provide blueprint specific error handlers.</li>
<li>Implemented generic <a class="reference internal" href="views.html#views"><em>Pluggable Views</em></a> (class based views).</li>
</ul>
</div>
<div class="section" id="version-0-6-1">
<h2>Version 0.6.1<a class="headerlink" href="#version-0-6-1" title="Permalink to this headline">¶</a></h2>
<p>Bugfix release, released on December 31st 2010</p>
<ul class="simple">
<li>Fixed an issue where the default <cite>OPTIONS</cite> response was
not exposing all valid methods in the <cite>Allow</cite> header.</li>
<li>Jinja2 template loading syntax now allows &#8221;./&#8221; in front of
a template load path.  Previously this caused issues with
module setups.</li>
<li>Fixed an issue where the subdomain setting for modules was
ignored for the static folder.</li>
<li>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.</li>
</ul>
</div>
<div class="section" id="version-0-6">
<h2>Version 0.6<a class="headerlink" href="#version-0-6" title="Permalink to this headline">¶</a></h2>
<p>Released on July 27th 2010, codename Whisky</p>
<ul class="simple">
<li>after request functions are now called in reverse order of
registration.</li>
<li>OPTIONS is now automatically implemented by Flask unless the
application explicitly adds &#8216;OPTIONS&#8217; as method to the URL rule.
In this case no automatic OPTIONS handling kicks in.</li>
<li>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&#8217;s part of a mapping in the .yml
file.</li>
<li>the <a class="reference internal" href="api.html#flask.Flask.config" title="flask.Flask.config"><tt class="xref py py-attr docutils literal"><span class="pre">config</span></tt></a> is now available in the templates
as <cite>config</cite>.</li>
<li>context processors will no longer override values passed directly
to the render function.</li>
<li>added the ability to limit the incoming request data with the
new <tt class="docutils literal"><span class="pre">MAX_CONTENT_LENGTH</span></tt> configuration value.</li>
<li>the endpoint for the <tt class="xref py py-meth docutils literal"><span class="pre">flask.Module.add_url_rule()</span></tt> method
is now optional to be consistent with the function of the
same name on the application object.</li>
<li>added a <a class="reference internal" href="api.html#flask.make_response" title="flask.make_response"><tt class="xref py py-func docutils literal"><span class="pre">flask.make_response()</span></tt></a> function that simplifies
creating response object instances in views.</li>
<li>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 <a class="reference external" href="http://pypi.python.org/pypi/blinker">blinker</a> installed.</li>
<li>refactored the way URL adapters are created.  This process is now
fully customizable with the <a class="reference internal" href="api.html#flask.Flask.create_url_adapter" title="flask.Flask.create_url_adapter"><tt class="xref py py-meth docutils literal"><span class="pre">create_url_adapter()</span></tt></a>
method.</li>
<li>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.</li>
</ul>
</div>
<div class="section" id="version-0-5-2">
<h2>Version 0.5.2<a class="headerlink" href="#version-0-5-2" title="Permalink to this headline">¶</a></h2>
<p>Bugfix Release, released on July 15th 2010</p>
<ul class="simple">
<li>fixed another issue with loading templates from directories when
modules were used.</li>
</ul>
</div>
<div class="section" id="version-0-5-1">
<h2>Version 0.5.1<a class="headerlink" href="#version-0-5-1" title="Permalink to this headline">¶</a></h2>
<p>Bugfix Release, released on July 6th 2010</p>
<ul class="simple">
<li>fixes an issue with template loading from directories when modules
where used.</li>
</ul>
</div>
<div class="section" id="version-0-5">
<h2>Version 0.5<a class="headerlink" href="#version-0-5" title="Permalink to this headline">¶</a></h2>
<p>Released on July 6th 2010, codename Calvados</p>
<ul class="simple">
<li>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 <cite>SERVER_NAME</cite> config key.  This key is now also used to set
the session cookie cross-subdomain wide.</li>
<li>autoescaping is no longer active for all templates.  Instead it
is only active for <tt class="docutils literal"><span class="pre">.html</span></tt>, <tt class="docutils literal"><span class="pre">.htm</span></tt>, <tt class="docutils literal"><span class="pre">.xml</span></tt> and <tt class="docutils literal"><span class="pre">.xhtml</span></tt>.
Inside templates this behaviour can be changed with the
<tt class="docutils literal"><span class="pre">autoescape</span></tt> tag.</li>
<li>refactored Flask internally.  It now consists of more than a
single file.</li>
<li><a class="reference internal" href="api.html#flask.send_file" title="flask.send_file"><tt class="xref py py-func docutils literal"><span class="pre">flask.send_file()</span></tt></a> now emits etags and has the ability to
do conditional responses builtin.</li>
<li>(temporarily) dropped support for zipped applications.  This was a
rarely used feature and led to some confusing behaviour.</li>
<li>added support for per-package template and static-file directories.</li>
<li>removed support for <cite>create_jinja_loader</cite> which is no longer used
in 0.5 due to the improved module support.</li>
<li>added a helper function to expose files from any directory.</li>
</ul>
</div>
<div class="section" id="version-0-4">
<h2>Version 0.4<a class="headerlink" href="#version-0-4" title="Permalink to this headline">¶</a></h2>
<p>Released on June 18th 2010, codename Rakia</p>
<ul class="simple">
<li>added the ability to register application wide error handlers
from modules.</li>
<li><a class="reference internal" href="api.html#flask.Flask.after_request" title="flask.Flask.after_request"><tt class="xref py py-meth docutils literal"><span class="pre">after_request()</span></tt></a> handlers are now also invoked
if the request dies with an exception and an error handling page
kicks in.</li>
<li>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.</li>
<li>because the Python standard library caches loggers, the name of
the logger is configurable now to better support unittests.</li>
<li>added <cite>TESTING</cite> switch that can activate unittesting helpers.</li>
<li>the logger switches to <cite>DEBUG</cite> mode now if debug is enabled.</li>
</ul>
</div>
<div class="section" id="version-0-3-1">
<h2>Version 0.3.1<a class="headerlink" href="#version-0-3-1" title="Permalink to this headline">¶</a></h2>
<p>Bugfix release, released on May 28th 2010</p>
<ul class="simple">
<li>fixed a error reporting bug with <a class="reference internal" href="api.html#flask.Config.from_envvar" title="flask.Config.from_envvar"><tt class="xref py py-meth docutils literal"><span class="pre">flask.Config.from_envvar()</span></tt></a></li>
<li>removed some unused code from flask</li>
<li>release does no longer include development leftover files (.git
folder for themes, built documentation in zip and pdf file and
some .pyc files)</li>
</ul>
</div>
<div class="section" id="version-0-3">
<h2>Version 0.3<a class="headerlink" href="#version-0-3" title="Permalink to this headline">¶</a></h2>
<p>Released on May 28th 2010, codename Schnaps</p>
<ul class="simple">
<li>added support for categories for flashed messages.</li>
<li>the application now configures a <tt class="xref py py-class docutils literal"><span class="pre">logging.Handler</span></tt> 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.</li>
<li>added support for context binding that does not require the use of
the with statement for playing in the console.</li>
<li>the request context is now available within the with statement making
it possible to further push the request context or pop it.</li>
<li>added support for configurations.</li>
</ul>
</div>
<div class="section" id="version-0-2">
<h2>Version 0.2<a class="headerlink" href="#version-0-2" title="Permalink to this headline">¶</a></h2>
<p>Released on May 12th 2010, codename Jägermeister</p>
<ul class="simple">
<li>various bugfixes</li>
<li>integrated JSON support</li>
<li>added <a class="reference internal" href="api.html#flask.get_template_attribute" title="flask.get_template_attribute"><tt class="xref py py-func docutils literal"><span class="pre">get_template_attribute()</span></tt></a> helper function.</li>
<li><a class="reference internal" href="api.html#flask.Flask.add_url_rule" title="flask.Flask.add_url_rule"><tt class="xref py py-meth docutils literal"><span class="pre">add_url_rule()</span></tt></a> can now also register a
view function.</li>
<li>refactored internal request dispatching.</li>
<li>server listens on 127.0.0.1 by default now to fix issues with chrome.</li>
<li>added external URL support.</li>
<li>added support for <a class="reference internal" href="api.html#flask.send_file" title="flask.send_file"><tt class="xref py py-func docutils literal"><span class="pre">send_file()</span></tt></a></li>
<li>module support and internal request handling refactoring
to better support pluggable applications.</li>
<li>sessions can be set to be permanent now on a per-session basis.</li>
<li>better error reporting on missing secret keys.</li>
<li>added support for Google Appengine.</li>
</ul>
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<div class="section" id="version-0-1">
<h2>Version 0.1<a class="headerlink" href="#version-0-1" title="Permalink to this headline">¶</a></h2>
<p>First public preview release.</p>
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  <h3><a href="index.html">Table Of Contents</a></h3>
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<li><a class="reference internal" href="#">Flask Changelog</a><ul>
<li><a class="reference internal" href="#version-0-9">Version 0.9</a></li>
<li><a class="reference internal" href="#version-0-8">Version 0.8</a></li>
<li><a class="reference internal" href="#version-0-7-3">Version 0.7.3</a></li>
<li><a class="reference internal" href="#version-0-7-2">Version 0.7.2</a></li>
<li><a class="reference internal" href="#version-0-7-1">Version 0.7.1</a></li>
<li><a class="reference internal" href="#version-0-7">Version 0.7</a></li>
<li><a class="reference internal" href="#version-0-6-1">Version 0.6.1</a></li>
<li><a class="reference internal" href="#version-0-6">Version 0.6</a></li>
<li><a class="reference internal" href="#version-0-5-2">Version 0.5.2</a></li>
<li><a class="reference internal" href="#version-0-5-1">Version 0.5.1</a></li>
<li><a class="reference internal" href="#version-0-5">Version 0.5</a></li>
<li><a class="reference internal" href="#version-0-4">Version 0.4</a></li>
<li><a class="reference internal" href="#version-0-3-1">Version 0.3.1</a></li>
<li><a class="reference internal" href="#version-0-3">Version 0.3</a></li>
<li><a class="reference internal" href="#version-0-2">Version 0.2</a></li>
<li><a class="reference internal" href="#version-0-1">Version 0.1</a></li>
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<h3>Related Topics</h3>
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