diff --git a/swh/web/api/views/origin.py b/swh/web/api/views/origin.py
--- a/swh/web/api/views/origin.py
+++ b/swh/web/api/views/origin.py
@@ -21,6 +21,7 @@
 from swh.web.common import archive
 from swh.web.common.exc import BadInputExc
 from swh.web.common.origin_visits import get_origin_visits
+from swh.web.common.typing import OriginInfo
 from swh.web.common.utils import origin_visit_types, reverse
 
 DOC_RETURN_ORIGIN = """
@@ -143,6 +144,7 @@
     return api_lookup(
         archive.lookup_origin,
         ori_dict,
+        lookup_similar_urls=False,
         notfound_msg=error_msg,
         enrich_fn=enrich_origin,
         request=request,
@@ -326,7 +328,7 @@
 
     """
     result = {}
-    origin_query = {"url": origin_url}
+    origin_query = OriginInfo(url=origin_url)
     notfound_msg = "No origin {} found".format(origin_url)
     url_args_next = {"origin_url": origin_url}
     per_page = int(request.query_params.get("per_page", "10"))
@@ -334,7 +336,7 @@
     last_visit = int(last_visit_str) if last_visit_str else None
 
     def _lookup_origin_visits(origin_query, last_visit=last_visit, per_page=per_page):
-        all_visits = get_origin_visits(origin_query)
+        all_visits = get_origin_visits(origin_query, lookup_similar_urls=False)
         all_visits.reverse()
         visits = []
         if not last_visit:
@@ -412,11 +414,13 @@
 
             :swh_web_api:`origin/https://github.com/hylang/hy/visit/latest/`
     """
+
     require_snapshot = request.query_params.get("require_snapshot", "false")
     return api_lookup(
         archive.lookup_origin_visit_latest,
         origin_url,
         bool(strtobool(require_snapshot)),
+        lookup_similar_urls=False,
         notfound_msg=("No visit for origin {} found".format(origin_url)),
         enrich_fn=partial(
             enrich_origin_visit, with_origin_link=True, with_origin_visit_link=False
@@ -453,10 +457,12 @@
 
             :swh_web_api:`origin/https://github.com/hylang/hy/visit/1/`
     """
+
     return api_lookup(
         archive.lookup_origin_visit,
         origin_url,
         int(visit_id),
+        lookup_similar_urls=False,
         notfound_msg=("No visit {} for origin {} found".format(visit_id, origin_url)),
         enrich_fn=partial(
             enrich_origin_visit, with_origin_link=True, with_origin_visit_link=False
diff --git a/swh/web/common/archive.py b/swh/web/common/archive.py
--- a/swh/web/common/archive.py
+++ b/swh/web/common/archive.py
@@ -232,18 +232,20 @@
     return converters.from_swh(lic, hashess={"id"})
 
 
-def lookup_origin(origin: OriginInfo) -> OriginInfo:
+def lookup_origin(origin: OriginInfo, lookup_similar_urls: bool = True) -> OriginInfo:
     """Return information about the origin matching dict origin.
 
     Args:
         origin: origin's dict with 'url' key
+        lookup_similar_urls: if :const:`True`, lookup origin with and
+            without trailing slash in its URL
 
     Returns:
         origin information as dict.
 
     """
     origin_urls = [origin["url"]]
-    if origin["url"]:
+    if origin["url"] and lookup_similar_urls:
         # handle case when user provided an origin url with a trailing
         # slash while the url in storage does not have it (e.g. GitHub)
         if origin["url"].endswith("/"):
@@ -977,9 +979,9 @@
     """Yields the origin origins' visits.
 
     Args:
-        origin_url (str): origin to list visits for
-        last_visit (int): last visit to lookup from
-        limit (int): Number of elements max to display
+        origin_url: origin to list visits for
+        last_visit: last visit to lookup from
+        limit: Number of elements max to display
 
     Yields:
        OriginVisit for that origin
@@ -1018,6 +1020,7 @@
     require_snapshot: bool = False,
     type: Optional[str] = None,
     allowed_statuses: Optional[List[str]] = None,
+    lookup_similar_urls: bool = True,
 ) -> Optional[OriginVisitInfo]:
     """Return the origin's latest visit
 
@@ -1030,12 +1033,19 @@
             ``allowed_statuses=['full']`` will only consider visits that
             have successfully run to completion.
         require_snapshot: filter out origins without a snapshot
+        lookup_similar_urls: if :const:`True`, lookup origin with and
+            without trailing slash in its URL
 
     Returns:
        The origin visit info as dict if found
 
     """
 
+    # check origin existence in the archive
+    origin_url = lookup_origin(
+        OriginInfo(url=origin_url), lookup_similar_urls=lookup_similar_urls
+    )["url"]
+
     visit_status = origin_get_latest_visit_status(
         storage,
         origin_url,
@@ -1048,12 +1058,18 @@
     )
 
 
-def lookup_origin_visit(origin_url: str, visit_id: int) -> OriginVisitInfo:
+def lookup_origin_visit(
+    origin_url: str,
+    visit_id: int,
+    lookup_similar_urls: bool = True,
+) -> OriginVisitInfo:
     """Return information about visit visit_id with origin origin.
 
     Args:
         origin: origin concerned by the visit
         visit_id: the visit identifier to lookup
+        lookup_similar_urls: if :const:`True`, lookup origin with and
+            without trailing slash in its URL
 
     Raises:
         NotFoundExc if no origin visit matching the criteria is found
@@ -1062,6 +1078,11 @@
        The dict origin_visit concerned
 
     """
+    # check origin existence in the archive
+    origin_url = lookup_origin(
+        OriginInfo(url=origin_url), lookup_similar_urls=lookup_similar_urls
+    )["url"]
+
     visit = storage.origin_visit_get_by(origin_url, visit_id)
     visit_status = storage.origin_visit_status_get_latest(origin_url, visit_id)
     if not visit:
diff --git a/swh/web/common/origin_visits.py b/swh/web/common/origin_visits.py
--- a/swh/web/common/origin_visits.py
+++ b/swh/web/common/origin_visits.py
@@ -13,7 +13,9 @@
 from swh.web.common.utils import parse_iso8601_date_to_utc
 
 
-def get_origin_visits(origin_info: OriginInfo) -> List[OriginVisitInfo]:
+def get_origin_visits(
+    origin_info: OriginInfo, lookup_similar_urls: bool = True
+) -> List[OriginVisitInfo]:
     """Function that returns the list of visits for a swh origin.
     That list is put in cache in order to speedup the navigation
     in the swh web browse ui.
@@ -23,6 +25,8 @@
 
     Args:
         origin_info: dict describing the origin to fetch visits from
+        lookup_similar_urls: if :const:`True`, lookup origin with and
+            without trailing slash in its URL
 
     Returns:
         A list of dict describing the origin visits
@@ -33,10 +37,9 @@
 
     from swh.web.common import archive
 
-    if "url" in origin_info:
-        origin_url = origin_info["url"]
-    else:
-        origin_url = archive.lookup_origin(origin_info)["url"]
+    origin_url = archive.lookup_origin(
+        origin_info, lookup_similar_urls=lookup_similar_urls
+    )["url"]
 
     cache_entry_id = "origin_visits_%s" % origin_url
     cache_entry = cache.get(cache_entry_id)
diff --git a/swh/web/tests/api/views/test_origin.py b/swh/web/tests/api/views/test_origin.py
--- a/swh/web/tests/api/views/test_origin.py
+++ b/swh/web/tests/api/views/test_origin.py
@@ -32,24 +32,26 @@
 from swh.web.tests.utils import check_api_get_responses
 
 
-def test_api_lookup_origin_visits_raise_error(api_client, mocker):
+def test_api_lookup_origin_visits_raise_error(api_client, origin, mocker):
     mock_get_origin_visits = mocker.patch("swh.web.api.views.origin.get_origin_visits")
     err_msg = "voluntary error to check the bad request middleware."
 
     mock_get_origin_visits.side_effect = BadInputExc(err_msg)
 
-    url = reverse("api-1-origin-visits", url_args={"origin_url": "http://foo"})
+    url = reverse("api-1-origin-visits", url_args={"origin_url": origin["url"]})
     rv = check_api_get_responses(api_client, url, status_code=400)
     assert rv.data == {"exception": "BadInputExc", "reason": err_msg}
 
 
-def test_api_lookup_origin_visits_raise_swh_storage_error_db(api_client, mocker):
+def test_api_lookup_origin_visits_raise_swh_storage_error_db(
+    api_client, origin, mocker
+):
     mock_get_origin_visits = mocker.patch("swh.web.api.views.origin.get_origin_visits")
     err_msg = "Storage exploded! Will be back online shortly!"
 
     mock_get_origin_visits.side_effect = StorageDBError(err_msg)
 
-    url = reverse("api-1-origin-visits", url_args={"origin_url": "http://foo"})
+    url = reverse("api-1-origin-visits", url_args={"origin_url": origin["url"]})
     rv = check_api_get_responses(api_client, url, status_code=503)
     assert rv.data == {
         "exception": "StorageDBError",
@@ -57,13 +59,15 @@
     }
 
 
-def test_api_lookup_origin_visits_raise_swh_storage_error_api(api_client, mocker):
+def test_api_lookup_origin_visits_raise_swh_storage_error_api(
+    api_client, origin, mocker
+):
     mock_get_origin_visits = mocker.patch("swh.web.api.views.origin.get_origin_visits")
     err_msg = "Storage API dropped dead! Will resurrect asap!"
 
     mock_get_origin_visits.side_effect = StorageAPIError(err_msg)
 
-    url = reverse("api-1-origin-visits", url_args={"origin_url": "http://foo"})
+    url = reverse("api-1-origin-visits", url_args={"origin_url": origin["url"]})
     rv = check_api_get_responses(api_client, url, status_code=503)
     assert rv.data == {
         "exception": "StorageAPIError",
@@ -837,3 +841,27 @@
         assert {o["url"] for o in rv.data} == {
             o["url"] for o in archived_origins if o["type"] == visit_type
         }
+
+
+@pytest.mark.parametrize(
+    "view_name, extra_args",
+    [
+        ("api-1-origin", {}),
+        ("api-1-origin-visits", {}),
+        ("api-1-origin-visit", {"visit_id": 1}),
+        ("api-1-origin-visit-latest", {}),
+        ("api-origin-intrinsic-metadata", {}),
+    ],
+)
+def test_api_origin_by_url_with_extra_trailing_slash(
+    api_client, origin, view_name, extra_args
+):
+    origin_url = origin["url"]
+    assert not origin_url.endswith("/")
+    origin_url = origin_url + "/"
+    url = reverse(view_name, url_args={"origin_url": origin_url, **extra_args})
+    rv = check_api_get_responses(api_client, url, status_code=404)
+    assert rv.data == {
+        "exception": "NotFoundExc",
+        "reason": f"Origin with url {origin_url} not found!",
+    }