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//lib/python3/dist-packages/requests_toolbelt/sessions.py

import requests

from ._compat import urljoin

class BaseUrlSession(requests.Session):
    """A Session with a URL that all requests will use as a base.

Let's start by looking at an example:

.. code-block:: python

>>> from requests_toolbelt import sessions
        >>> s = sessions.BaseUrlSession(
        ...     base_url='https://example.com/resource/')
        >>> r = s.get('sub-resource/' params={'foo': 'bar'})
        >>> print(r.request.url)
        https://example.com/resource/sub-resource/?foo=bar

Our call to the ``get`` method will make a request to the URL passed in
    when we created the Session and the partial resource name we provide.

We implement this by overriding the ``request`` method so most uses of a
    Session are covered. (This, however, precludes the use of PreparedRequest
    objects).

.. note::

The base URL that you provide and the path you provide are **very**
        important.

Let's look at another *similar* example

.. code-block:: python

>>> from requests_toolbelt import sessions
        >>> s = sessions.BaseUrlSession(
        ...     base_url='https://example.com/resource/')
        >>> r = s.get('/sub-resource/' params={'foo': 'bar'})
        >>> print(r.request.url)
        https://example.com/sub-resource/?foo=bar

The key difference here is that we called ``get`` with ``/sub-resource/``,
    i.e., there was a leading ``/``. This changes how we create the URL
    because we rely on :mod:`urllib.parse.urljoin`.

To override how we generate the URL, sub-class this method and override the
    ``create_url`` method.

Based on implementation from
    https://github.com/kennethreitz/requests/issues/2554#issuecomment-109341010
    """

base_url = None

def __init__(self, base_url=None):
        if base_url:
            self.base_url = base_url
        super(BaseUrlSession, self).__init__()

def request(self, method, url, *args, **kwargs):
        """Send the request after generating the complete URL."""
        url = self.create_url(url)
        return super(BaseUrlSession, self).request(
            method, url, *args, **kwargs
        )

def create_url(self, url):
        """Create the URL based off this partial path."""
        return urljoin(self.base_url, url)