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HTTP traffic mocking and expectations made easy

Project description

pook Build Status PyPI Coverage Status Documentation Status Stability Code Climate Python Versions

Versatile, expressive and hackable utility library for HTTP traffic mocking and expectations made easy in Python. Heavily inspired by gock.

To get started, see the documentation, how it works, FAQ or examples.


  • Simple, expressive and fluent API.

  • Provides both Pythonic and chainable DSL API styles.

  • Full-featured HTTP response definitions and expectations.

  • Matches any HTTP protocol primitive (URL, method, query params, headers, body…).

  • Full regular expressions capable mock expectations matching.

  • Supports most popular HTTP clients via interceptor adapters.

  • Configurable volatile, persistent or TTL limited mocks.

  • Works with any testing framework/engine (unittest, pytest, nosetests…).

  • First-class JSON & XML support matching and responses.

  • Supports JSON Schema body matching.

  • Works in both runtime and testing environments.

  • Can be used as decorator and/or via context managers.

  • Supports real networking mode with optional traffic filtering.

  • Map/filter mocks easily for generic or custom mock expectations.

  • Custom user-defined mock matcher functions.

  • Simulated raised error exceptions.

  • Network delay simulation (only available for aiohttp).

  • Pluggable and hackable API.

  • Customizable HTTP traffic mock interceptor engine.

  • Supports third-party mocking engines, such as mocket.

  • Fits good for painless test doubles.

  • Does not support WebSocket traffic mocking.

  • Works with +3.5 (including PyPy).

  • Dependency-less: just 2 small dependencies for JSONSchema and XML tree comparison.

Supported HTTP clients

pook can work with multiple mock engines, however it provides a built-in one by default, which currently supports traffic mocking in the following HTTP clients:

More HTTP clients can be supported progressively.

Note: only recent HTTP client package versions were tested.


Using pip package manager (requires pip 1.8+):

pip install --upgrade pook

Or install the latest sources from Github:

pip install -e git+git://

Getting started

See ReadTheDocs documentation:

Documentation Status


See annotated API reference documention.


See examples documentation for full featured code and use case examples.

Basic mocking:

import pook
import requests

def test_my_api():
    mock = pook.get('', reply=404, response_json={'error': 'not found'})

    resp = requests.get('')
    assert resp.status_code == 404
    assert resp.json() == {"error": "not found"}
    assert mock.calls == 1

Using the chainable API DSL:

import pook
import requests

def test_my_api():
    mock = (pook.get('')
              .json({'error': 'not found'}))

    resp = requests.get('')
    assert resp.json() == {"error": "not found"}
    assert mock.calls == 1

Using the decorator:

import pook
import requests

@pook.get('', reply=204)
@pook.get('', reply=200)
def fetch(url):
    return requests.get(url)

res = fetch('')
print('#1 status:', res.status_code)

res = fetch('')
print('#2 status:', res.status_code)

Simple unittest integration:

import pook
import unittest
import requests

class TestUnitTestEngine(unittest.TestCase):

    def test_request(self):
        res = requests.get('')
        self.assertEqual(res.status_code, 204)

    def test_request_with_context_manager(self):
        with pook.use():
            pook.get('', reply=204)
            res = requests.get('')
            self.assertEqual(res.status_code, 204)

Using the context manager for isolated HTTP traffic interception blocks:

import pook
import requests

# Enable HTTP traffic interceptor
with pook.use():
    pook.get('', reply=204)

    res = requests.get('')
    print('#1 status:', res.status_code)

# Interception-free HTTP traffic
res = requests.get('')
print('#2 status:', res.status_code)

Example using mocket Python library as underlying mock engine:

import pook
import requests
from mocket.plugins.pook_mock_engine import MocketEngine

# Use mocket library as underlying mock engine

# Explicitly enable pook HTTP mocking (optional)

# Target server URL to mock out
url = ''

# Define your mock
mock = pook.get(url,
                reply=404, times=2,
                headers={'content-type': 'application/json'},
                response_json={'error': 'foo'})

# Run first HTTP request
assert mock.calls == 1

# Run second HTTP request
res = requests.get(url)
assert mock.calls == 2

# Assert response data
assert res.status_code == 404
assert res.json() == {'error': 'foo'}

# Explicitly disable pook (optional)

Example using Hy language (Lisp dialect for Python):

(import [pook])
(import [requests])

(defn request [url &optional [status 404]]
  (doto (.mock pook url) (.reply status))
  (let [res (.get requests url)]
    (. res status_code)))

(defn run []
  (with [(.use pook)]
    (print "Status:" (request "" :status 204))))

;; Run test program
(defmain [&args] (run))


Clone the repository:

git clone

Install dependencies:

pip install -r requirements.txt -r requirements-dev.txt

Install Python dependencies:

make install

Lint code:

make lint

Run tests:

make test

Generate documentation:

make htmldocs


MIT - Tomas Aparicio

v1.1.0 / 2023-01-01

  • chore(version): bump minor v1.1.0

  • Switch to Python >= 3.5 and fix latest aiohttp compatability (#83)

  • fix: remove print call (#81)

v1.0.2 / 2021-09-10

  • fix(urllib3): interceptor is never really disabled (#68)

  • Closes #75 Re consider @fluent decorator (#76)

  • fix(#69): use match keyword in pytest.raises

  • fix(History): invalid rst syntax

v1.0.1 / 2020-03-24

  • fix(aiohttp): compatible with non aiohttp projects (#67)

  • feat(History): add release changes

v1.0.0 / 2020-03-18

  • fix(aiohttp): use latest version, allow Python 3.5+ for async http client

v0.2.8 / 2019-10-31

  • fix collections import warning (#61)

v0.2.7 / 2019-10-21

  • fix collections import warning (#61)

v0.2.6 / 2019-02-01

  • Add mock.reply(new_response=True) to reset response definition object

v0.2.5 / 2017-10-19

  • refactor(setup): remove extra install dependency

  • Fix py27 compatibility (#49)

  • Add activate_async decorator (#48)

  • fix typo in pook.mock.Mock.ismatched.__doc__ (#47)

  • fix README example (#46)

v0.2.4 / 2017-10-03

  • fix(#45): regex URL issue

  • fix(travis): allow failures in pypy

  • feat(docs): add sponsor banner

  • refactor(History): normalize style

v0.2.3 / 2017-04-28

  • feat(docs): add supported version for aiohttp

  • Merge branch ‘master’ of

  • fix(api): export missing symbol “disable_network”

  • Update README.rst (#43)

v0.2.2 / 2017-04-03

  • refactor(compare): disable maxDiff length limit while comparing values

v0.2.1 / 2017-03-25

  • fix(engine): enable new mock engine on register if needed

  • fix(engine): remove activate argument before instantiating the Mock

v0.2.0 / 2017-03-18

  • refactor(engine): do not activate engine on mock declaration if not explicitly requested. This introduces a behavioral library change: you must explicitly use pook.on() to enable pook mock engine.

v0.1.14 / 2017-03-17

  • feat(docs): list supported HTTP client versions

  • fix(#41): disable mocks after decorator call invokation

  • feat(examples): add mock context manager example file

  • feat(#40): support context manager definitions

  • feat(#39): improve unmatched request output

  • feat(docs): add mocket example file

  • feat(#33): add mocket examples and documentation

v0.1.13 / 2017-01-29

  • fix(api): mock.calls property should be an int.

v0.1.12 / 2017-01-28

  • feat(#33): proxy mock definitions into mock.Request

  • refactor(api): pook.unmatched_requests() now returns a list instead of a lazy tuple.

v0.1.11 / 2017-01-14

  • refactor(query)

  • fix(#37): fix URL comparison

  • fix(#38): proper mock engine interface validation.

v0.1.10 / 2017-01-13

  • fix(#37): decode byte bodies

  • feat( add author email

v0.1.9 / 2017-01-06

  • fix(Makefile): remove proper egg file

  • feat(package): add wheel package distribution support

  • feat(docs): add documentation links

v0.1.8 / 2016-12-24

  • fix(assertion): extract regex pattern only when required

  • feat(examples): add regular expression example

v0.1.7 / 2016-12-18

  • feat(#33): add support for user defined custom mock engine

v0.1.6 / 2016-12-14

  • fix( force utf-8 encoding

  • feat( add encoding header

  • feat(api): add debug mode

  • refactor(docs): minor enhancements

  • refactor(tests): update URL matcher test cases

  • refactor(docs): add note about HTTP clients and update features list

  • fix( remove encoding param

  • fix(tests): use strict equality assertion

0.1.5 / 2016-12-12

  • fix(matchers): fix matching issue in URL.

  • refactor(assertion): regex expression based matching must be explicitly enabled.

  • feat(tests): add initial matchers tests.

0.1.4 / 2016-12-08

  • refactor(README): minor changes

  • fix( lint error

  • fix(#32): use explicit encoding while reading files in

0.1.3 / 2016-12-08

  • fix(core): several bug fixes.

  • feat(core): add pending features and major refactors.

  • feat(matchers): use unittest.TestCase matching engine by default.

0.1.2 / 2016-12-01

  • fix(matchers): runtime missing variable.

0.1.1 / 2016-12-01

  • fix: Python 2 dictionary iteration syntax.

  • feat(docs): add more examples.

  • fix(matchers): better regular expression comparison support.

0.1.0 / 2016-11-30

  • First version (still beta)

0.1.0-rc.1 / 2016-11-27

  • First release candidate version (still beta)

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