Don't provide dist-info-metadata attribute

Fixes issue when pip tries to get unprovided metadata

src/proxpi/_cache.py

@@ -228,7 +228,14 @@ def _list_files(self, package_name: str):
             if child.tag == "a":
                 name = child.text
                 url = urllib.parse.urljoin(response.request.url, child.attrib["href"])
-                attributes = {k: v for k, v in child.attrib.items() if k != "href"}
+                attributes = {
+                    k: v
+                    for k, v in child.attrib.items()
+                    # Specifically ignore dist-info-metadat attribute: this version of
+                    # proxpi doesn't support serving the file. See GitHub issue
+                    # EpicWink/proxpi#23
+                    if k not in ("href", "data-dist-info-metadata")
+                }
                 fragment = urllib.parse.urlsplit(url).fragment
                 package.files[name] = File(name, url, fragment, attributes)
         self._packages[package_name] = package

tests/test_integration.py

@@ -48,6 +48,7 @@ def test_pip_download(server, tmp_path):
         "download",
         "--index-url",
         "http://127.0.0.1:5042/index/",
+        "--no-deps",
     ]
     p = subprocess.run(
         [*args, "--dest", str(tmp_path / "dest1"), "Jinja2", "marshmallow"]
@@ -62,6 +63,9 @@ def test_pip_download(server, tmp_path):
     contents = list((tmp_path / "dest2").iterdir())
     print(contents)
     assert any("jinja2" in p.name.lower() for p in contents)
+    subprocess.run(
+        [*args, "--dest", str(tmp_path / "dest3"), "sphinx == 7.0.1"], check=True
+    )
 
 
 def test_list(server):