--- a/lib/python3.8/site-packages/pip/_vendor/cachecontrol/adapter.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,133 +0,0 @@
-import types
-import functools
-import zlib
-
-from pip._vendor.requests.adapters import HTTPAdapter
-
-from .controller import CacheController
-from .cache import DictCache
-from .filewrapper import CallbackFileWrapper
-
-
-class CacheControlAdapter(HTTPAdapter):
-    invalidating_methods = {"PUT", "DELETE"}
-
-    def __init__(
-        self,
-        cache=None,
-        cache_etags=True,
-        controller_class=None,
-        serializer=None,
-        heuristic=None,
-        cacheable_methods=None,
-        *args,
-        **kw
-    ):
-        super(CacheControlAdapter, self).__init__(*args, **kw)
-        self.cache = DictCache() if cache is None else cache
-        self.heuristic = heuristic
-        self.cacheable_methods = cacheable_methods or ("GET",)
-
-        controller_factory = controller_class or CacheController
-        self.controller = controller_factory(
-            self.cache, cache_etags=cache_etags, serializer=serializer
-        )
-
-    def send(self, request, cacheable_methods=None, **kw):
-        """
-        Send a request. Use the request information to see if it
-        exists in the cache and cache the response if we need to and can.
-        """
-        cacheable = cacheable_methods or self.cacheable_methods
-        if request.method in cacheable:
-            try:
-                cached_response = self.controller.cached_request(request)
-            except zlib.error:
-                cached_response = None
-            if cached_response:
-                return self.build_response(request, cached_response, from_cache=True)
-
-            # check for etags and add headers if appropriate
-            request.headers.update(self.controller.conditional_headers(request))
-
-        resp = super(CacheControlAdapter, self).send(request, **kw)
-
-        return resp
-
-    def build_response(
-        self, request, response, from_cache=False, cacheable_methods=None
-    ):
-        """
-        Build a response by making a request or using the cache.
-
-        This will end up calling send and returning a potentially
-        cached response
-        """
-        cacheable = cacheable_methods or self.cacheable_methods
-        if not from_cache and request.method in cacheable:
-            # Check for any heuristics that might update headers
-            # before trying to cache.
-            if self.heuristic:
-                response = self.heuristic.apply(response)
-
-            # apply any expiration heuristics
-            if response.status == 304:
-                # We must have sent an ETag request. This could mean
-                # that we've been expired already or that we simply
-                # have an etag. In either case, we want to try and
-                # update the cache if that is the case.
-                cached_response = self.controller.update_cached_response(
-                    request, response
-                )
-
-                if cached_response is not response:
-                    from_cache = True
-
-                # We are done with the server response, read a
-                # possible response body (compliant servers will
-                # not return one, but we cannot be 100% sure) and
-                # release the connection back to the pool.
-                response.read(decode_content=False)
-                response.release_conn()
-
-                response = cached_response
-
-            # We always cache the 301 responses
-            elif response.status == 301:
-                self.controller.cache_response(request, response)
-            else:
-                # Wrap the response file with a wrapper that will cache the
-                #   response when the stream has been consumed.
-                response._fp = CallbackFileWrapper(
-                    response._fp,
-                    functools.partial(
-                        self.controller.cache_response, request, response
-                    ),
-                )
-                if response.chunked:
-                    super_update_chunk_length = response._update_chunk_length
-
-                    def _update_chunk_length(self):
-                        super_update_chunk_length()
-                        if self.chunk_left == 0:
-                            self._fp._close()
-
-                    response._update_chunk_length = types.MethodType(
-                        _update_chunk_length, response
-                    )
-
-        resp = super(CacheControlAdapter, self).build_response(request, response)
-
-        # See if we should invalidate the cache.
-        if request.method in self.invalidating_methods and resp.ok:
-            cache_url = self.controller.cache_url(request.url)
-            self.cache.delete(cache_url)
-
-        # Give the request a from_cache attr to let people use it
-        resp.from_cache = from_cache
-
-        return resp
-
-    def close(self):
-        self.cache.close()
-        super(CacheControlAdapter, self).close()