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Commit018cf3f

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feature#4661 Added a short cookbook about avoiding the automatic start of the sessions (javiereguiluz)
This PR was merged into the 2.3 branch.Discussion----------Added a short cookbook about avoiding the automatic start of the sessions| Q | A| ------------- | ---| Doc fix? | no| New docs? | yes| Applies to | all| Fixed tickets |#2607Besides all the usual review, I'd like to ask doc reviewers to tell me if there is some way to avoid starting the session in the last case about defining a firewall that covers all URLs. Thanks in advance!Commits-------bbba47a Added all sugestions made by reviewers7dd3945 Added the new cookbook article to the global map0212779 Tweaks and rewordings to improve the article99781f8 Added a short cookbook about avoiding the automatic start of the sessions
2 parents208904a +bbba47a commit018cf3f

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‎cookbook/map.rst.inc‎

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* :doc:`/cookbook/session/sessions_directory`
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* :doc:`/cookbook/session/php_bridge`
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* (configuration) :doc:`/cookbook/configuration/pdo_session_storage`
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* :doc:`/cookbook/session/avoid_session_start`
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***symfony1**
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..index::
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single: Sessions, cookies
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Avoid Starting Sessions for Anonymous Users
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===========================================
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Sessions are automatically started whenever you read, write or even check for the
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existence of data in the session. This means that if you need to avoid creating
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a session cookie for some users, it can be difficult: you must *completely* avoid
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accessing the session.
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For example, one common problem in this situation involves checking for flash
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messages, which are stored in the session. The following code would guarantee
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that a session is *always* started:
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..code-block::html+jinja
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{% for flashMessage in app.session.flashbag.get('notice') %}
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<div class="flash-notice">
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{{ flashMessage }}
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</div>
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{% endfor %}
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Even if the user is not logged in and even if you haven't created any flash message,
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just calling the ``get()`` (or even ``has()``) method of the ``flashbag`` will
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start a session. This may hurt your application performance because all users will
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receive a session cookie. To avoid this behavior, add a check before trying to
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access the flash messages:
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..code-block::html+jinja
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{% if app.request.hasPreviousSession %}
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{% for flashMessage in app.session.flashbag.get('notice') %}
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<div class="flash-notice">
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{{ flashMessage }}
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</div>
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{% endfor %}
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{% endif %}

‎cookbook/session/index.rst‎

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proxy_examples
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locale_sticky_session
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sessions_directory
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php_bridge
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php_bridge
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avoid_session_start

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