Support escape character in ContentDisposition

Closes gh-23077

spring-web/src/test/java/org/springframework/http/ContentDispositionTests.java

@@ -79,6 +79,14 @@ public class ContentDispositionTests {
 				.filename("中文.txt", StandardCharsets.UTF_8).build(), disposition);
 	}
 
+	@Test // gh-23077
+	public void parseWithEscapedQuote() {
+		ContentDisposition disposition = ContentDisposition.parse(
+				"form-data; name=\"file\"; filename=\"\\\"The Twilight Zone\\\".txt\"; size=123");
+		assertEquals(ContentDisposition.builder("form-data").name("file")
+				.filename("\\\"The Twilight Zone\\\".txt").size(123L).build(), disposition);
+	}
+
 	@Test(expected = IllegalArgumentException.class)
 	public void parseEmpty() {
 		ContentDisposition.parse("");