Agent Solution

TASK OBJECTIVE

psf/requests

Why can't a Python Requests Response object be pickled?

A compatibility record separating serializable response data from live transport state across Requests and urllib3 versions.

TypeErrorPython traceback repairs

SOURCE BOUNDARY

Why both claims can be true

A Response can define a pickle state while still retaining raw transport objects that cannot be serialized directly. Body consumption, the Response field allow-list, excluded connection state, and reconstruction semantics determine whether a particular object becomes a detached snapshot or raises an exception.

VERSIONED RECORD

Field map by version and response state

The versioned record aligns each Response field with __getstate__, the body-consumption boundary, urllib3 ownership, the resulting exception, and the behavior available after unpickling. That field map is the evidence boundary for deciding what a specific application can safely preserve.

REQUEST ENDPOINT

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GET/tasks/psf-requests-typeerror-response/view{?model,framework,task,tried,why}

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Agent clients can use the task-specific llms.txt evidence-search guide.

01

TASK STATEMENT

verbatim agent-facing issue statement

allow Response class to be pickled
```
Python 2.7.4 (default, Apr 19 2013, 18:32:33) 
[GCC 4.7.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import pickle, requests
>>> pickle.dumps(requests.get('http://example.org'))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/pickle.py", line 1374, in dumps
    Pickler(file, protocol).dump(obj)
  File "/usr/lib/python2.7/pickle.py", line 224, in dump
    self.save(obj)
  File "/usr/lib/python2.7/pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "/usr/lib/python2.7/pickle.py", line 419, in save_reduce
    save(state)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems
    save(v)
  File "/usr/lib/python2.7/pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "/usr/lib/python2.7/pickle.py", line 419, in save_reduce
    save(state)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems
    save(v)
  File "/usr/lib/python2.7/pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "/usr/lib/python2.7/pickle.py", line 419, in save_reduce
    save(state)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems
    save(v)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 725, in save_inst
    save(stuff)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems
    save(v)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 600, in save_list
    self._batch_appends(iter(obj))
  File "/usr/lib/python2.7/pickle.py", line 615, in _batch_appends
    save(x)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 725, in save_inst
    save(stuff)
  File "/usr/lib/python2.7/pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/lib/python2.7/pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "/usr/lib/python2.7/pickle.py", line 663, in _batch_setitems
    save(v)
  File "/usr/lib/python2.7/pickle.py", line 306, in save
    rv = reduce(self.proto)
  File "/usr/lib/python2.7/copy_reg.py", line 77, in _reduce_ex
    raise TypeError("a class that defines __slots__ without "
TypeError: a class that defines __slots__ without defining __getstate__ cannot be pickled
```

Match evidence

Primary terms

TypeErrorResponserequests/models.pypsf/requestsallow Response class to be pickledrequests.Responsepickle.dumps__getstate____setstate____slots__copy_reg._reduce_exPickler.save_reduce

Technical objective

Make a requests.Response object serialisable with pickle and restorable from the pickled form. The deliverable is whatever serialisation support the Response object graph needs so that pickle.dumps on a response succeeds and the round-tripped object is usable.

Success condition

pickle.dumps(...) on a response produced by a normal request completes without raising, the result can be loaded back, and the restored object exposes the response data a caller would expect (status, headers, body/content, and the associated request information) with no change to the behaviour of live, un-pickled responses.

Search fingerprints

  • Error signature: TypeError
  • Traceback path: requests/models.py
  • Repository: psf/requests
  • Issue title: allow Response class to be pickled.
  • Symbols: requests.Response, pickle.dumps, __getstate__, __setstate__, __slots__, copy_reg._reduce_ex, Pickler.save_reduce, save_inst, _batch_setitems.
  • Files: requests/models.py, requests/structures.py, requests/cookies.py, requests/sessions.py.
  • Verbatim error string: TypeError: a class that defines __slots__ without defining __getstate__ cannot be pickled.
  • Reproduction: import pickle, requests then pickle.dumps(requests.get('http://example.org')).
  • Environment quoted in the report: Python 2.7.4 (default, Apr 19 2013, 18:32:33), [GCC 4.7.3] on linux2.

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