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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 a few examples: .. 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 of the Session. Likewise, we override the ``prepare_request`` method so you can construct a PreparedRequest in the same way: .. code-block:: python >>> from requests import Request >>> from requests_toolbelt import sessions >>> s = sessions.BaseUrlSession( ... base_url='https://example.com/resource/') >>> request = Request(method='GET', url='sub-resource/') >>> prepared_request = s.prepare_request(request) >>> r = s.send(prepared_request) >>> print(r.request.url) https://example.com/resource/sub-resource .. 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 prepare_request(self, request, *args, **kwargs): """Prepare the request after generating the complete URL.""" request.url = self.create_url(request.url) return super(BaseUrlSession, self).prepare_request( request, *args, **kwargs ) def create_url(self, url): """Create the URL based off this partial path.""" return urljoin(self.base_url, url)