unreleased
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==========
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Features
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--------
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- Added an execution policy hook to the request pipeline. An execution
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policy has the ability to control creation and execution of the request
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objects before they enter rest of the pipeline. This means for a given
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request that the policy may create more than one request for retry
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purposes. See https://github.com/Pylons/pyramid/pull/2964
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Bug Fixes
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---------
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- HTTPException's accepts a detail kwarg that may be used to pass additional
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details to the exception. You may now pass objects so long as they have a
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valid __str__ method. See https://github.com/Pylons/pyramid/pull/2951
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- Fix a reference cycle causing memory leaks in which the registry
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would keep a ``Configurator`` instance alive even after the configurator
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was discarded. Another fix was also added for the ``global_registries``
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object in which the registry was stored in a closure preventing it from
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being deallocated. See https://github.com/Pylons/pyramid/pull/2967
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Deprecations
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------------
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Backward Incompatibilities
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--------------------------
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Documentation Changes
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---------------------
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