Fix Undertow compression config with invalid Mime Types

Prior to this commit, the Undertow compression configuration provided by
Spring Boot would fail and throw an exception for invalid MIME Types
when trying to check them against the list of configured types for
compression.

This commit ensures that invalid MIME Types are ignored and that
compression is disabled for those.

Fixes gh-20955

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowCompressionConfigurer.java

@@ -32,6 +32,7 @@ import io.undertow.util.HttpString;
 
 import org.springframework.boot.web.server.Compression;
 import org.springframework.http.HttpHeaders;
+import org.springframework.util.InvalidMimeTypeException;
 import org.springframework.util.MimeType;
 import org.springframework.util.MimeTypeUtils;
 
@@ -90,12 +91,18 @@ final class UndertowCompressionConfigurer {
 		public boolean resolve(HttpServerExchange value) {
 			String contentType = value.getResponseHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
 			if (contentType != null) {
+				try {
+					MimeType parsed = MimeTypeUtils.parseMimeType(contentType);
 					for (MimeType mimeType : this.mimeTypes) {
-					if (mimeType.isCompatibleWith(MimeTypeUtils.parseMimeType(contentType))) {
+						if (mimeType.isCompatibleWith(parsed)) {
 							return true;
 						}
 					}
 				}
+				catch (InvalidMimeTypeException ex) {
+					return false;
+				}
+			}
 			return false;
 		}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/reactive/server/AbstractReactiveWebServerFactoryTests.java

@@ -357,10 +357,12 @@ public abstract class AbstractReactiveWebServerFactoryTests {
 	}
 
 	protected void assertResponseIsCompressed(ResponseEntity<Void> response) {
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
 		assertThat(response.getHeaders().getFirst("X-Test-Compressed")).isEqualTo("true");
 	}
 
 	protected void assertResponseIsNotCompressed(ResponseEntity<Void> response) {
+		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);
 		assertThat(response.getHeaders().keySet()).doesNotContain("X-Test-Compressed");
 	}