File name is null bug fixed

Signed-off-by: Andras Dobrosi <dobrosi@gmail.com>

Author: dobrosi

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

@@ -252,7 +252,7 @@ public static ContentDisposition parse(String contentDisposition) {
 			String part = parts.get(i);
 			int eqIndex = part.indexOf('=');
 			if (eqIndex != -1) {
-				String attribute = part.substring(0, eqIndex);
+				String attribute = part.substring(0, eqIndex).toLowerCase();
 				String value = (part.startsWith("\"", eqIndex + 1) && part.endsWith("\"") ?
 						part.substring(eqIndex + 2, part.length() - 1) :
 						part.substring(eqIndex + 1));

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

@@ -180,6 +180,14 @@ void parseWithExtraSemicolons() {
 						.build());
 	}
 
+	@Test
+	void parseAttributesCaseIgnore() {
+		ContentDisposition cd = ContentDisposition.parse("form-data; Name=\"foo\"; FileName=\"bar.txt\"");
+		assertThat(cd.getName()).isEqualTo("foo");
+		assertThat(cd.getFilename()).isEqualTo("bar.txt");
+		assertThat(cd.toString()).isEqualTo("form-data; name=\"foo\"; filename=\"bar.txt\"");
+	}
+
 	@Test
 	void parseEmpty() {
 		assertThatIllegalArgumentException().isThrownBy(() -> parse(""));