diff --git a/spring-web/src/main/java/org/springframework/http/HttpHeaders.java b/spring-web/src/main/java/org/springframework/http/HttpHeaders.java
index f0432d50502..c9dc894eeca 100644
--- a/spring-web/src/main/java/org/springframework/http/HttpHeaders.java
+++ b/spring-web/src/main/java/org/springframework/http/HttpHeaders.java
@@ -491,6 +491,25 @@ public class HttpHeaders implements Serializable {
 		}
 	}
 
+	/**
+	 * Create a new {@code HttpHeaders} mutable instance and copy all header values given as a parameter.
+	 * @param headers the headers to copy
+	 * @since 7.0
+	 */
+	public static HttpHeaders copyOf(MultiValueMap<String, String> headers) {
+		HttpHeaders httpHeadersCopy = new HttpHeaders();
+		headers.forEach((key, values) -> httpHeadersCopy.put(key, new ArrayList<>(values)));
+		return httpHeadersCopy;
+	}
+
+	/**
+	 * Create a new {@code HttpHeaders} mutable instance and copy all header values given as a parameter.
+	 * @param httpHeaders the headers to copy
+	 * @since 7.0
+	 */
+	public static HttpHeaders copyOf(HttpHeaders httpHeaders) {
+		return copyOf(httpHeaders.headers);
+	}
 
 	/**
 	 * Get the list of header values for the given header name, if any.
diff --git a/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java b/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java
index eb5fafdc41d..8ec4278c569 100644
--- a/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java
+++ b/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java
@@ -49,7 +49,6 @@ class ReadOnlyHttpHeaders extends HttpHeaders {
 	@SuppressWarnings("serial")
 	private @Nullable List<MediaType> cachedAccept;
 
-
 	ReadOnlyHttpHeaders(MultiValueMap<String, String> headers) {
 		super(headers);
 	}
diff --git a/spring-web/src/test/java/org/springframework/http/HttpHeadersTests.java b/spring-web/src/test/java/org/springframework/http/HttpHeadersTests.java
index 9045bcdfefb..0fdc071b407 100644
--- a/spring-web/src/test/java/org/springframework/http/HttpHeadersTests.java
+++ b/spring-web/src/test/java/org/springframework/http/HttpHeadersTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 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.
@@ -77,6 +77,22 @@ class HttpHeadersTests {
 		writeable.setContentType(MediaType.APPLICATION_JSON);
 	}
 
+	@Test
+	void copyOfCopiesHeaders() {
+		headers.setContentType(MediaType.APPLICATION_JSON);
+		headers.add("X-Project", "Spring");
+		headers.add("X-Project", "Framework");
+		HttpHeaders readOnly = HttpHeaders.readOnlyHttpHeaders(headers);
+		assertThat(readOnly.getContentType()).isEqualTo(MediaType.APPLICATION_JSON);
+
+		HttpHeaders writable = HttpHeaders.copyOf(readOnly);
+		writable.setContentType(MediaType.TEXT_PLAIN);
+		// content-type value is cached by ReadOnlyHttpHeaders
+		assertThat(readOnly.getContentType()).isEqualTo(MediaType.APPLICATION_JSON);
+		assertThat(writable.getContentType()).isEqualTo(MediaType.TEXT_PLAIN);
+		assertThat(writable.get("X-Project")).contains("Spring", "Framework");
+	}
+
 	@Test
 	void getOrEmpty() {
 		String key = "FOO";