session: Cache http requests of trusted hosts

news/9498.feature.rst

@@ -0,0 +1 @@
+If a host is explicitly specified as trusted by the user (via the --trusted-host option), cache HTTP responses from it in addition to HTTPS ones.

src/pip/_internal/network/session.py

@@ -358,8 +358,15 @@ def add_trusted_host(
         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]:
+            self.mount(
+                build_url_from_netloc(host, scheme="http") + ":",
+                self._trusted_host_adapter,
+            )
             # Mount wildcard ports for the same host.
             self.mount(build_url_from_netloc(host) + ":", self._trusted_host_adapter)
 

tests/unit/test_network_session.py

@@ -82,6 +82,7 @@ def test_trusted_hosts_adapter(self, tmpdir):
         # Check that the "port wildcard" is present.
         assert "https://example.com:" in session.adapters
         # Check that the cache is enabled.
+        assert hasattr(session.adapters["http://example.com/"], "cache")
         assert hasattr(session.adapters["https://example.com/"], "cache")
 
     def test_add_trusted_host(self):
@@ -93,12 +94,20 @@ def test_add_trusted_host(self):
         prefix3 = "https://host3/"
         prefix3_wildcard = "https://host3:"
 
+        prefix2_http = "http://host2/"
+        prefix3_http = "http://host3/"
+        prefix3_wildcard_http = "http://host3:"
+
         # Confirm some initial conditions as a baseline.
         assert session.pip_trusted_origins == [("host1", None), ("host3", None)]
         assert session.adapters[prefix3] is trusted_host_adapter
         assert session.adapters[prefix3_wildcard] is trusted_host_adapter
 
+        assert session.adapters[prefix3_http] is trusted_host_adapter
+        assert session.adapters[prefix3_wildcard_http] is trusted_host_adapter
+
         assert prefix2 not in session.adapters
+        assert prefix2_http not in session.adapters
 
         # Test adding a new host.
         session.add_trusted_host("host2")
@@ -110,6 +119,7 @@ def test_add_trusted_host(self):
         # Check that prefix3 is still present.
         assert session.adapters[prefix3] is trusted_host_adapter
         assert session.adapters[prefix2] is trusted_host_adapter
+        assert session.adapters[prefix2_http] is trusted_host_adapter
 
         # Test that adding the same host doesn't create a duplicate.
         session.add_trusted_host("host3")
@@ -121,13 +131,15 @@ def test_add_trusted_host(self):
 
         session.add_trusted_host("host4:8080")
         prefix4 = "https://host4:8080/"
+        prefix4_http = "http://host4:8080/"
         assert session.pip_trusted_origins == [
             ("host1", None),
             ("host3", None),
             ("host2", None),
             ("host4", 8080),
         ]
         assert session.adapters[prefix4] is trusted_host_adapter
+        assert session.adapters[prefix4_http] is trusted_host_adapter
 
     def test_add_trusted_host__logging(self, caplog):
         """