diff --git a/alfa-service/src/main/java/de/ozgcloud/alfa/vorgang/VorgangURIResolver.java b/alfa-service/src/main/java/de/ozgcloud/alfa/vorgang/VorgangURIResolver.java
index c3b6a185dce5c3e3189fabe78e6301c23ccce5a0..3a7549d4eac9459c604e2bbdc454e69616b173d1 100644
--- a/alfa-service/src/main/java/de/ozgcloud/alfa/vorgang/VorgangURIResolver.java
+++ b/alfa-service/src/main/java/de/ozgcloud/alfa/vorgang/VorgangURIResolver.java
@@ -15,7 +15,7 @@ class VorgangURIResolver implements OzgcloudResourceURIResolver {
 
 	static final String REL_NAME = "vorgang";
 
-	private final Pattern pattern = Pattern.compile("ozgcloud://[^/]+/vorgangs/([0-9a-fA-F]+)");
+	private final Pattern pattern = Pattern.compile(".+/vorgangs/([0-9a-fA-F]+)");
 
 	@Override
 	public Optional<Link> resolve(String uri) {
diff --git a/alfa-service/src/test/java/de/ozgcloud/alfa/resource/OzgcloudResourceControllerITCase.java b/alfa-service/src/test/java/de/ozgcloud/alfa/resource/OzgcloudResourceControllerITCase.java
index a545d2ee05325037544e883b529b7c39d4d9c991..3efe0e5735528b084a6137ecea2a6dbb584182d0 100644
--- a/alfa-service/src/test/java/de/ozgcloud/alfa/resource/OzgcloudResourceControllerITCase.java
+++ b/alfa-service/src/test/java/de/ozgcloud/alfa/resource/OzgcloudResourceControllerITCase.java
@@ -31,34 +31,35 @@ class OzgcloudResourceControllerITCase {
 	class TestGetOzgcloudResource {
 
 		private static final String VORGANG_ID = AlfaTestUtils.createMongoDbObjectId();
+		private static final String VALID_URI = "dns:///dummy.service:123/vorgangs/" + VORGANG_ID;
+		private static final String INVALID_URI = "dns:///dummy.service:123/" + VORGANG_ID;
 
 		@Test
 		void shouldReturnStatusOk() throws Exception {
-			var response = doRequest("ozgcloud://test.de/vorgangs/" + VORGANG_ID);
+			var response = doRequest("dns:///test.de/vorgangs/" + VORGANG_ID);
 
 			response.andExpect(status().isOk());
 		}
 
 		@Test
 		void shouldHaveVorgangLink() throws Exception {
-			var response = doRequest("ozgcloud://test.de/vorgangs/" + VORGANG_ID);
+			var response = doRequest(VALID_URI);
 
 			response.andExpect(jsonPath("$._links.vorgang.href").value(StringEndsWith.endsWith("/api/vorgangs/" + VORGANG_ID)));
 		}
 
 		@Test
 		void shouldHaveSelfLink() throws Exception {
-			var uri = "ozgcloud://test.de/vorgangs/" + VORGANG_ID;
-			var encodedUri = URLEncoder.encode(uri, StandardCharsets.UTF_8);
+			var encodedUri = URLEncoder.encode(VALID_URI, StandardCharsets.UTF_8);
 
-			var response = doRequest(uri);
+			var response = doRequest(VALID_URI);
 
 			response.andExpect(jsonPath("$._links.self.href").value(StringEndsWith.endsWith(OzgcloudResourceController.PATH + "?uri=" + encodedUri)));
 		}
 
 		@Test
 		void shouldReturnStatusNotFound() throws Exception {
-			var response = doRequest("dummy://test.de");
+			var response = doRequest(INVALID_URI);
 
 			response.andExpect(status().isNotFound());
 		}
diff --git a/alfa-service/src/test/java/de/ozgcloud/alfa/vorgang/VorgangURIResolverTest.java b/alfa-service/src/test/java/de/ozgcloud/alfa/vorgang/VorgangURIResolverTest.java
index 1d691c621cc7e42d207861ccb6503bd04026a74c..d6751ed39774791873a025506c2eb7c46ed06747 100644
--- a/alfa-service/src/test/java/de/ozgcloud/alfa/vorgang/VorgangURIResolverTest.java
+++ b/alfa-service/src/test/java/de/ozgcloud/alfa/vorgang/VorgangURIResolverTest.java
@@ -2,10 +2,11 @@ package de.ozgcloud.alfa.vorgang;
 
 import static org.assertj.core.api.Assertions.*;
 
+import java.util.stream.Stream;
+
 import org.junit.jupiter.api.Nested;
-import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
-import org.junit.jupiter.params.provider.ValueSource;
+import org.junit.jupiter.params.provider.MethodSource;
 import org.springframework.hateoas.Link;
 import org.springframework.hateoas.LinkRelation;
 
@@ -18,24 +19,20 @@ class VorgangURIResolverTest {
 	@Nested
 	class TestResolve {
 
-		private final String VORGANG_ID = AlfaTestUtils.createMongoDbObjectId();
-		private final String VORGANG_URI = "ozgcloud://dummy.de/vorgangs/" + VORGANG_ID;
+		private static final String VORGANG_ID = AlfaTestUtils.createMongoDbObjectId();
 
 		@ParameterizedTest
-		@ValueSource(strings = {
-				"http://dummy.de/vorgangs/123",
-				"ozgcloud://dummy.de/res-a/123",
-				"ozgcloud://dummy.de/xyz/vorgangs/123",
-				"ozgcloud://dummy.de/vorgangs/xyz/123" })
+		@MethodSource("invalidVorgangUris")
 		void shouldReturnEmptyIfUriIsNotRecognized(String uri) {
 			var result = resolver.resolve(uri);
 
 			assertThat(result).isEmpty();
 		}
 
-		@Test
-		void shouldReturnLink() {
-			var result = resolver.resolve(VORGANG_URI);
+		@ParameterizedTest
+		@MethodSource("validVorgangUris")
+		void shouldReturnLink(String uri) {
+			var result = resolver.resolve(uri);
 
 			assertThat(result).isPresent();
 		}
@@ -43,19 +40,36 @@ class VorgangURIResolverTest {
 		@Nested
 		class TestVorgangLink {
 
-			@Test
-			void shouldHaveCorrectRelValue() {
-				var result = resolver.resolve(VORGANG_URI);
+			@ParameterizedTest
+			@MethodSource("de.ozgcloud.alfa.vorgang.VorgangURIResolverTest$TestResolve#validVorgangUris")
+			void shouldHaveCorrectRelValue(String uri) {
+				var result = resolver.resolve(uri);
 
 				assertThat(result).get().extracting(Link::getRel).extracting(LinkRelation::value).isEqualTo(VorgangURIResolver.REL_NAME);
 			}
 
-			@Test
-			void shouldHaveHrefOfVorgang() {
-				var result = resolver.resolve(VORGANG_URI);
+			@ParameterizedTest
+			@MethodSource("de.ozgcloud.alfa.vorgang.VorgangURIResolverTest$TestResolve#validVorgangUris")
+			void shouldHaveHrefOfVorgang(String uri) {
+				var result = resolver.resolve(uri);
 
 				assertThat(result).get().extracting(Link::getHref).isEqualTo("/api/vorgangs/" + VORGANG_ID);
 			}
 		}
+
+		private static Stream<String> validVorgangUris() {
+			return Stream.of(
+					"dns:///dummy.service/vorgangs/" + VORGANG_ID,
+					"dns:///dummy.service:123/vorgangs/" + VORGANG_ID,
+					"http://dummy.web.url/vorgangs/" + VORGANG_ID);
+		}
+
+		private static Stream<String> invalidVorgangUris() {
+			return Stream.of("dns:///dummy.service/res-a/" + VORGANG_ID,
+					"dns:///dummy.service/" + VORGANG_ID,
+					"dns:///dummy.service/vorgangs/xyz/" + VORGANG_ID,
+					"dns:///dummy.service/vorgangs/not-a-vorgang-id",
+					"dns:///dummy.service/vorgangs/" + VORGANG_ID + "/not-a-vorgang-id");
+		}
 	}
 }