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wireprotov2: server support for sending content redirects...
wireprotov2: server support for sending content redirects A "content redirect" can be sent in place of inline response content. In terms of code, we model a content redirect as a special type of response object holding the attributes describing that redirect. Sending a content redirect thus becomes as simple as the object emission layer sending an instance of that type. A cacher using externally-addressable content storage could replace the outgoing object stream with an object advertising its location. The bulk of the code in this commit is teaching the output layer which handles the object stream to recognize alternate location objects. The rules are that if an alternate location object is present, it must be the first and only object in the object stream. Otherwise the server emits an error. Differential Revision: https://phab.mercurial-scm.org/D4777
Siddharth Agarwal - - Load All Authors

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exceptions.py
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/ mercurial / thirdparty / attr / exceptions.py
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from __future__ import absolute_import, division, print_function
class FrozenInstanceError(AttributeError):
"""
A frozen/immutable instance has been attempted to be modified.
It mirrors the behavior of ``namedtuples`` by using the same error message
and subclassing :exc:`AttributeError`.
.. versionadded:: 16.1.0
"""
msg = "can't set attribute"
args = [msg]
class AttrsAttributeNotFoundError(ValueError):
"""
An ``attrs`` function couldn't find an attribute that the user asked for.
.. versionadded:: 16.2.0
"""
class NotAnAttrsClassError(ValueError):
"""
A non-``attrs`` class has been passed into an ``attrs`` function.
.. versionadded:: 16.2.0
"""
class DefaultAlreadySetError(RuntimeError):
"""
A default has been set using ``attr.ib()`` and is attempted to be reset
using the decorator.
.. versionadded:: 17.1.0
"""