diff --git a/repo2docker/contentproviders/doi.py b/repo2docker/contentproviders/doi.py
index 64b93202..ee51a83e 100644
--- a/repo2docker/contentproviders/doi.py
+++ b/repo2docker/contentproviders/doi.py
@@ -49,7 +49,9 @@ def doi2url(self, doi):
             doi = normalize_doi(doi)
 
             try:
-                resp = self._request(f"https://doi.org/{doi}")
+                # We don't need to fetch the *contents* of the page the doi resolves to -
+                # only need to know what it redirects to.
+                resp = self._request(f"https://doi.org/{doi}", allow_redirects=False)
                 resp.raise_for_status()
             except HTTPError as e:
                 # If the DOI doesn't exist, just return URL
@@ -60,7 +62,7 @@ def doi2url(self, doi):
                 # default Git provider as this leads to a misleading error.
                 self.log.error(f"DOI {doi} does not resolve: {e}")
                 raise
-            return resp.url
+            return resp.headers["Location"]
         else:
             # Just return what is actulally just a URL
             return doi
diff --git a/tests/unit/contentproviders/test_dataverse.py b/tests/unit/contentproviders/test_dataverse.py
index abdfe456..54e45863 100644
--- a/tests/unit/contentproviders/test_dataverse.py
+++ b/tests/unit/contentproviders/test_dataverse.py
@@ -70,8 +70,8 @@ def doi_resolver(req, context):
     assert requests_mock.call_count == 0
     # valid Dataverse DOIs trigger this content provider
     assert Dataverse().detect(test_input[0]) == expected[0]
-    # 4: doi resolution (302), File, doi resolution (302), then dataset
-    assert requests_mock.call_count == 4
+    # 4: doi resolution (302), doi resolution (302)
+    assert requests_mock.call_count == 2
     requests_mock.reset_mock()
 
     assert Dataverse().detect(test_input[1]) == expected[0]
diff --git a/tests/unit/contentproviders/test_doi.py b/tests/unit/contentproviders/test_doi.py
index 301b50be..58cae5f5 100644
--- a/tests/unit/contentproviders/test_doi.py
+++ b/tests/unit/contentproviders/test_doi.py
@@ -33,7 +33,7 @@ def test_url_headers(requests_mock):
 @pytest.mark.parametrize(
     "requested_doi, expected",
     [
-        ("10.5281/zenodo.3242074", "https://zenodo.org/records/3242074"),
+        ("10.5281/zenodo.3242074", "https://zenodo.org/record/3242074"),
         # Unresolving DOI:
         ("10.1/1234", "10.1/1234"),
     ],
diff --git a/tests/unit/contentproviders/test_hydroshare.py b/tests/unit/contentproviders/test_hydroshare.py
index 0c8acfd1..fba7c686 100755
--- a/tests/unit/contentproviders/test_hydroshare.py
+++ b/tests/unit/contentproviders/test_hydroshare.py
@@ -75,8 +75,8 @@ def test_detect_hydroshare(requests_mock):
     assert (
         Hydroshare().detect("10.4211/hs.b8f6eae9d89241cf8b5904033460af61") == expected
     )
-    # assert 3 calls were made, 2 to resolve the DOI (302 + 200) and another to fetch the version
-    assert requests_mock.call_count == 3
+    # assert 2 calls were made, 1 to resolve the DOI (302) and another to fetch the version
+    assert requests_mock.call_count == 2
     requests_mock.reset_mock()
 
     assert (
diff --git a/tests/unit/contentproviders/test_zenodo.py b/tests/unit/contentproviders/test_zenodo.py
index 38737ae1..185cb737 100644
--- a/tests/unit/contentproviders/test_zenodo.py
+++ b/tests/unit/contentproviders/test_zenodo.py
@@ -66,8 +66,8 @@ def test_detect_zenodo(test_input, expected, requests_mock):
     assert Zenodo().detect(test_input[0]) == expected
     assert Zenodo().detect(test_input[1]) == expected
     assert Zenodo().detect(test_input[2]) == expected
-    # only two of the three calls above have to resolve a DOI (2 req per doi resolution)
-    assert requests_mock.call_count == 4
+    # only two of the three calls above have to resolve a DOI (1 req per doi resolution)
+    assert requests_mock.call_count == 2
     requests_mock.reset_mock()
 
     # Don't trigger the Zenodo content provider