Detect Undertow RequestTooBigException message in handleParseFailure

Closes gh-32549

spring-web/src/test/java/org/springframework/web/multipart/support/StandardMultipartHttpServletRequestTests.java

@@ -123,6 +123,14 @@ class StandardMultipartHttpServletRequestTests {
 				.isThrownBy(() -> requestWithException(ex)).withCause(ex);
 	}
 
+	@Test  // gh-32549
+	void undertowRequestTooBigException() {
+		IOException ex = new IOException("Connection terminated as request was larger than 10000");
+
+		assertThatExceptionOfType(MaxUploadSizeExceededException.class)
+				.isThrownBy(() -> requestWithException(ex)).withCause(ex);
+	}
+
 
 	private static StandardMultipartHttpServletRequest requestWithPart(String name, String disposition, String content) {
 		MockHttpServletRequest request = new MockHttpServletRequest();
@@ -142,4 +150,14 @@ class StandardMultipartHttpServletRequestTests {
 		return new StandardMultipartHttpServletRequest(request);
 	}
 
+	private static StandardMultipartHttpServletRequest requestWithException(IOException ex) {
+		MockHttpServletRequest request = new MockHttpServletRequest() {
+			@Override
+			public Collection<Part> getParts() throws IOException {
+				throw ex;
+			}
+		};
+		return new StandardMultipartHttpServletRequest(request);
+	}
+
 }