Merge branch '6.2.x'

Author: bclozel

spring-web/src/main/java/org/springframework/http/ContentDisposition.java

@@ -69,6 +69,7 @@ public final class ContentDisposition {
 		for (int i=33; i<= 126; i++) {
 			PRINTABLE.set(i);
 		}
+		PRINTABLE.set(34, false); // "
 		PRINTABLE.set(61, false); // =
 		PRINTABLE.set(63, false); // ?
 		PRINTABLE.set(95, false); // _

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

@@ -268,6 +268,13 @@ void formatWithFilenameWithQuotes() {
 		tester.accept("foo.txt\\\\\\", "foo.txt\\\\\\\\\\\\");
 	}
 
+	@Test
+	void formatWithUtf8FilenameWithQuotes() {
+		String filename = "\"中文.txt";
+		assertThat(ContentDisposition.formData().filename(filename, StandardCharsets.UTF_8).build().toString())
+				.isEqualTo("form-data; filename=\"=?UTF-8?Q?=22=E4=B8=AD=E6=96=87.txt?=\"; filename*=UTF-8''%22%E4%B8%AD%E6%96%87.txt");
+	}
+
 	@Test
 	void formatWithEncodedFilenameUsingInvalidCharset() {
 		assertThatIllegalArgumentException().isThrownBy(() ->