Harden DHMV WCS request headers

backend/tests/test_sprint205_dhmv_terrain.py

@@ -200,6 +200,28 @@ def test_dhmv_multipart_geotiff_is_extracted_and_invalid_response_fails_closed()
     assert exc_info.value.code == "DHMV_PROVIDER_INVALID_RESPONSE"
 
 
+def test_dhmv_fetch_sends_explicit_accept_header_required_by_official_wcs() -> None:
+    observed_headers: dict[str, str | None] = {}
+
+    def opener(request, **_kwargs):
+        observed_headers["accept"] = request.get_header("Accept")
+        observed_headers["user_agent"] = request.get_header("User-agent")
+        return FakeResponse(b"II*\x00test", "image/tiff")
+
+    content, content_type = DhmvAcquisitionService._fetch(
+        "https://geo.api.vlaanderen.be/DHMV/wcs?bounded=true",
+        Settings(_env_file=None),
+        opener,
+    )
+
+    assert content == b"II*\x00test"
+    assert content_type == "image/tiff"
+    assert observed_headers == {
+        "accept": "*/*",
+        "user_agent": "GeoIntel/0.1 bounded-dhmv-acquisition",
+    }
+
+
 def test_dhmv_acquisition_clips_validates_and_persists_via_dataset_service(tmp_path) -> None:
     project_id = uuid4()
     area_id = uuid4()