session: Cache http requests to trusted hosts

Author: Noah Gorny

src/pip/_internal/network/session.py

@@ -327,12 +327,20 @@ def add_trusted_host(self, host, source=None, suppress_logging=False):
         if host_port not in self.pip_trusted_origins:
             self.pip_trusted_origins.append(host_port)
 
+        self.mount(
+            build_url_from_netloc(host, scheme='http') + '/',
+            self._trusted_host_adapter
+        )
         self.mount(
             build_url_from_netloc(host) + '/',
             self._trusted_host_adapter
         )
         if not host_port[1]:
             # Mount wildcard ports for the same host.
+            self.mount(
+                build_url_from_netloc(host, scheme='http') + ':',
+                self._trusted_host_adapter
+            )
             self.mount(
                 build_url_from_netloc(host) + ':',
                 self._trusted_host_adapter