diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java
index a2223c29ea5..4775d37f2bc 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/function/DefaultServerRequest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 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.
@@ -26,10 +26,13 @@ import java.nio.charset.Charset;
 import java.security.Principal;
 import java.time.Instant;
 import java.util.AbstractMap;
+import java.util.AbstractSet;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.Enumeration;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -55,6 +58,7 @@ import org.springframework.http.converter.GenericHttpMessageConverter;
 import org.springframework.http.converter.HttpMessageConverter;
 import org.springframework.http.server.RequestPath;
 import org.springframework.http.server.ServletServerHttpRequest;
+import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.LinkedMultiValueMap;
@@ -73,6 +77,7 @@ import org.springframework.web.util.UriBuilder;
  *
  * @author Arjen Poutsma
  * @author Sam Brannen
+ * @author Patrick Strawderman
  * @since 5.2
  */
 class DefaultServerRequest implements ServerRequest {
@@ -433,18 +438,77 @@ class DefaultServerRequest implements ServerRequest {
 
 		@Override
 		public void clear() {
-			List<String> attributeNames = Collections.list(this.servletRequest.getAttributeNames());
-			attributeNames.forEach(this.servletRequest::removeAttribute);
+			this.servletRequest.getAttributeNames().asIterator().forEachRemaining(this.servletRequest::removeAttribute);
 		}
 
 		@Override
 		public Set<Entry<String, Object>> entrySet() {
-			return Collections.list(this.servletRequest.getAttributeNames()).stream()
-					.map(name -> {
-						Object value = this.servletRequest.getAttribute(name);
-						return new SimpleImmutableEntry<>(name, value);
-					})
-					.collect(Collectors.toSet());
+			return new AbstractSet<>() {
+				@Override
+				public Iterator<Entry<String, Object>> iterator() {
+					return new Iterator<>() {
+
+						private final Iterator<String> attributes = ServletAttributesMap.this.servletRequest.getAttributeNames().asIterator();
+
+						@Override
+						public boolean hasNext() {
+							return this.attributes.hasNext();
+						}
+
+						@Override
+						public Entry<String, Object> next() {
+							String attribute = this.attributes.next();
+							Object value = ServletAttributesMap.this.servletRequest.getAttribute(attribute);
+							return new SimpleImmutableEntry<>(attribute, value);
+						}
+					};
+				}
+
+				@Override
+				public boolean isEmpty() {
+					return ServletAttributesMap.this.isEmpty();
+				}
+
+				@Override
+				public int size() {
+					return ServletAttributesMap.this.size();
+				}
+
+				@Override
+				public boolean contains(Object o) {
+					if (!(o instanceof Map.Entry<?,?> entry)) {
+						return false;
+					}
+					String attribute = (String) entry.getKey();
+					Object value = ServletAttributesMap.this.servletRequest.getAttribute(attribute);
+					return value != null && value.equals(entry.getValue());
+				}
+
+				@Override
+				public boolean addAll(@NonNull Collection<? extends Entry<String, Object>> c) {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public boolean remove(Object o) {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public boolean removeAll(Collection<?> c) {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public boolean retainAll(@NonNull Collection<?> c) {
+					throw new UnsupportedOperationException();
+				}
+
+				@Override
+				public void clear() {
+					throw new UnsupportedOperationException();
+				}
+			};
 		}
 
 		@Override
@@ -467,6 +531,22 @@ class DefaultServerRequest implements ServerRequest {
 			this.servletRequest.removeAttribute(name);
 			return value;
 		}
+
+		@Override
+		public int size() {
+			Enumeration<String> attributes = this.servletRequest.getAttributeNames();
+			int size = 0;
+			while (attributes.hasMoreElements()) {
+				size++;
+				attributes.nextElement();
+			}
+			return size;
+		}
+
+		@Override
+		public boolean isEmpty() {
+			return !this.servletRequest.getAttributeNames().hasMoreElements();
+		}
 	}
 
 
diff --git a/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultServerRequestTests.java b/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultServerRequestTests.java
index 30707f1a8ec..bce1120ddcd 100644
--- a/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultServerRequestTests.java
+++ b/spring-webmvc/src/test/java/org/springframework/web/servlet/function/DefaultServerRequestTests.java
@@ -27,10 +27,12 @@ import java.security.Principal;
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
 import java.util.Collections;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.OptionalLong;
+import java.util.Set;
 
 import jakarta.servlet.http.Cookie;
 import jakarta.servlet.http.Part;
@@ -61,8 +63,8 @@ import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
 
 /**
+ * Tests for {@link DefaultServerRequest}.
  * @author Arjen Poutsma
- * @since 5.1
  */
 class DefaultServerRequestTests {
 
@@ -114,6 +116,46 @@ class DefaultServerRequestTests {
 		assertThat(request.attribute("foo")).contains("bar");
 	}
 
+	@Test
+	void attributes() {
+		MockHttpServletRequest servletRequest = PathPatternsTestUtils.initRequest("GET", "/", true);
+		servletRequest.setAttribute("foo", "bar");
+		servletRequest.setAttribute("baz", "qux");
+
+		DefaultServerRequest request = new DefaultServerRequest(servletRequest, this.messageConverters);
+
+		Map<String, Object> attributesMap = request.attributes();
+		assertThat(attributesMap).isNotEmpty();
+		assertThat(attributesMap).containsEntry("foo", "bar");
+		assertThat(attributesMap).containsEntry("baz", "qux");
+		assertThat(attributesMap).doesNotContainEntry("foo", "blah");
+
+		Set<Map.Entry<String, Object>> entrySet = attributesMap.entrySet();
+		assertThat(entrySet).isNotEmpty();
+		assertThat(entrySet).hasSize(attributesMap.size());
+		assertThat(entrySet).contains(Map.entry("foo", "bar"));
+		assertThat(entrySet).contains(Map.entry("baz", "qux"));
+		assertThat(entrySet).doesNotContain(Map.entry("foo", "blah"));
+		assertThat(entrySet).isUnmodifiable();
+
+		assertThat(entrySet.iterator()).toIterable().contains(Map.entry("foo", "bar"), Map.entry("baz", "qux"));
+		Iterator<String> attributes = servletRequest.getAttributeNames().asIterator();
+		Iterator<Map.Entry<String, Object>> entrySetIterator = entrySet.iterator();
+		while (attributes.hasNext()) {
+			attributes.next();
+			assertThat(entrySetIterator).hasNext();
+			entrySetIterator.next();
+		}
+		assertThat(entrySetIterator).isExhausted();
+
+		attributesMap.clear();
+		assertThat(attributesMap).isEmpty();
+		assertThat(attributesMap).hasSize(0);
+		assertThat(entrySet).isEmpty();
+		assertThat(entrySet).hasSize(0);
+		assertThat(entrySet.iterator()).isExhausted();
+	}
+
 	@Test
 	void params() {
 		MockHttpServletRequest servletRequest = PathPatternsTestUtils.initRequest("GET", "/", true);