DefaultWebClient exposes full URI template as request attribute

Closes gh-30027

spring-web/src/main/java/org/springframework/web/util/DefaultUriBuilderFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -410,6 +410,11 @@ public class DefaultUriBuilderFactory implements UriBuilderFactory {
 			}
 			return URI.create(uric.toString());
 		}
+
+		@Override
+		public String toUriString() {
+			return this.uriComponentsBuilder.build().toUriString();
+		}
 	}
 
 }

spring-web/src/main/java/org/springframework/web/util/UriBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -270,4 +270,13 @@ public interface UriBuilder {
 	 */
 	URI build(Map<String, ?> uriVariables);
 
+	/**
+	 * Return a String representation of the URI by concatenating all URI
+	 * component values into the fully formed URI String. Implementing classes
+	 * should perform simple String concatenation of current URI component
+	 * values to preserve URI template placeholders.
+	 * @since 6.1.2
+	 */
+	String toUriString();
+
 }

spring-web/src/main/java/org/springframework/web/util/UriComponentsBuilder.java

@@ -501,7 +501,8 @@ public class UriComponentsBuilder implements UriBuilder, Cloneable {
 	 * @see UriComponents#toUriString()
 	 */
 	public String toUriString() {
-		return (this.uriVariables.isEmpty() ? build().encode().toUriString() :
+		return (this.uriVariables.isEmpty() ?
+				build().encode().toUriString() :
 				buildInternal(EncodingHint.ENCODE_TEMPLATE).toUriString());
 	}
 

spring-web/src/test/java/org/springframework/web/util/DefaultUriBuilderFactoryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -186,4 +186,12 @@ public class DefaultUriBuilderFactoryTests {
 		assertThat(uri.toString()).isEqualTo("/foo/bar");
 	}
 
+	@Test // gh-30027
+	void uriTemplateString() {
+		String baseUrl = "https://github.com/spring-projects/spring-boot/releases";
+		String uriTemplate = "/tag/v{version}";
+		String actual = new DefaultUriBuilderFactory(baseUrl).uriString(uriTemplate).toUriString();
+		assertThat(actual).isEqualTo(baseUrl + uriTemplate);
+	}
+
 }

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultWebClient.java

@@ -226,8 +226,9 @@ final class DefaultWebClient implements WebClient {
 
 		@Override
 		public RequestBodySpec uri(String uriTemplate, Object... uriVariables) {
-			attribute(URI_TEMPLATE_ATTRIBUTE, uriTemplate);
+			UriBuilder uriBuilder = uriBuilderFactory.uriString(uriTemplate);
-			return uri(uriBuilderFactory.expand(uriTemplate, uriVariables));
+			attribute(URI_TEMPLATE_ATTRIBUTE, uriBuilder.toUriString());
+			return uri(uriBuilder.build(uriVariables));
 		}
 
 		@Override

spring-webflux/src/test/java/org/springframework/web/reactive/function/client/WebClientObservationTests.java

@@ -82,7 +82,7 @@ class WebClientObservationTests {
 		ClientRequest clientRequest = verifyAndGetRequest();
 
 		assertThatHttpObservation().hasLowCardinalityKeyValue("outcome", "SUCCESS")
-				.hasLowCardinalityKeyValue("uri", "/resource/{id}");
+				.hasLowCardinalityKeyValue("uri", "/base/resource/{id}");
 		assertThat(clientRequest.headers()).containsEntry("foo", Collections.singletonList("bar"));
 	}