Do not inject base URI components to absolute URIs.

PrefixAwareUriBuilderFactory now no longer injects components from a base URI into a URI that is considered an absolute one (URI starting with https: or http: protocol schemes).

Resolves gh-377.

spring-vault-core/src/main/java/org/springframework/vault/client/VaultClients.java

@@ -219,6 +219,10 @@ public class VaultClients {
 		@Override
 		public UriBuilder uriString(String uriTemplate) {
 
+			if (uriTemplate.startsWith("http:") || uriTemplate.startsWith("https:")) {
+				return UriComponentsBuilder.fromUriString(uriTemplate);
+			}
+
 			VaultEndpoint endpoint = endpointProvider.getVaultEndpoint();
 
 			String baseUri = toBaseUri(endpoint);

spring-vault-core/src/test/java/org/springframework/vault/client/VaultClientsUnitTests.java

@@ -23,6 +23,7 @@ import org.springframework.http.HttpEntity;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.test.web.client.MockRestServiceServer;
+import org.springframework.vault.client.VaultClients.PrefixAwareUriBuilderFactory;
 import org.springframework.vault.client.VaultClients.PrefixAwareUriTemplateHandler;
 import org.springframework.web.client.RestTemplate;
 
@@ -40,7 +41,7 @@ import static org.springframework.test.web.client.response.MockRestResponseCreat
 public class VaultClientsUnitTests {
 
 	@Test
-	public void shouldPrefixRelativeUrl() {
+	public void uriHandlerShouldPrefixRelativeUrl() {
 
 		VaultEndpoint localhost = VaultEndpoint.create("localhost", 8200);
 		PrefixAwareUriTemplateHandler handler = new PrefixAwareUriTemplateHandler(
@@ -52,7 +53,7 @@ public class VaultClientsUnitTests {
 	}
 
 	@Test
-	public void shouldNotPrefixAbsoluteUrl() {
+	public void uriHandlerShouldNotPrefixAbsoluteUrl() {
 
 		VaultEndpoint localhost = VaultEndpoint.create("localhost", 8200);
 		PrefixAwareUriTemplateHandler handler = new PrefixAwareUriTemplateHandler(
@@ -64,6 +65,31 @@ public class VaultClientsUnitTests {
 				.hasPath("/path/bar");
 	}
 
+	@Test
+	public void uriBuilderShouldPrefixRelativeUrl() {
+
+		VaultEndpoint localhost = VaultEndpoint.create("localhost", 8200);
+		PrefixAwareUriBuilderFactory handler = new PrefixAwareUriBuilderFactory(
+				() -> localhost);
+
+		URI uri = handler.expand("/path/{bar}", "bar");
+
+		assertThat(uri).hasHost("localhost").hasPort(8200).hasPath("/v1/path/bar");
+	}
+
+	@Test
+	public void uriBuilderShouldNotPrefixAbsoluteUrl() {
+
+		VaultEndpoint localhost = VaultEndpoint.create("localhost", 8200);
+		PrefixAwareUriBuilderFactory handler = new PrefixAwareUriBuilderFactory(
+				() -> localhost);
+
+		URI uri = handler.expand("https://foo/path/{bar}", "bar");
+
+		assertThat(uri).hasScheme("https").hasHost("foo").hasPort(-1)
+				.hasPath("/path/bar");
+	}
+
 	@Test
 	public void shouldApplyNamespace() {