Handle invalid MediaType in Jetty/Tomcat adapters

See: gh-23553

spring-web/src/main/java/org/springframework/http/server/reactive/AbstractServerHttpResponse.java

@@ -262,8 +262,13 @@ protected Mono<Void> doCommit(@Nullable Supplier<? extends Mono<Void>> writeActi
 	protected abstract void applyStatusCode();
 
 	/**
-	 * Apply header changes from {@link #getHeaders()} to the underlying response.
-	 * This method is called once only.
+	 * Invoked when the response is getting committed allowing sub-classes to
+	 * make apply header values to the underlying response.
+	 * <p>Note that most sub-classes use an {@link HttpHeaders} instance that
+	 * wraps an adapter to the native response headers such that changes are
+	 * propagated to the underlying response on the go. That means this callback
+	 * is typically not used other than for specialized updates such as setting
+	 * the contentType or characterEncoding fields in a Servlet response.
 	 */
 	protected abstract void applyHeaders();
 

spring-web/src/main/java/org/springframework/http/server/reactive/JettyHttpHandlerAdapter.java

@@ -101,8 +101,15 @@ private static HttpHeaders createHeaders(HttpServletResponse response) {
 
 		@Override
 		protected void applyHeaders() {
-			MediaType contentType = getHeaders().getContentType();
 			HttpServletResponse response = getNativeResponse();
+			MediaType contentType = null;
+			try {
+				contentType = getHeaders().getContentType();
+			}
+			catch (Exception ex) {
+				String rawContentType = getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
+				response.setContentType(rawContentType);
+			}
 			if (response.getContentType() == null && contentType != null) {
 				response.setContentType(contentType.toString());
 			}

spring-web/src/main/java/org/springframework/http/server/reactive/ServletServerHttpResponse.java

@@ -118,14 +118,25 @@ protected void applyHeaders() {
 				this.response.addHeader(headerName, headerValue);
 			}
 		});
-		MediaType contentType = getHeaders().getContentType();
+		MediaType contentType = null;
+		try {
+			contentType = getHeaders().getContentType();
+		}
+		catch (Exception ex) {
+			String rawContentType = getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
+			this.response.setContentType(rawContentType);
+		}
 		if (this.response.getContentType() == null && contentType != null) {
 			this.response.setContentType(contentType.toString());
 		}
 		Charset charset = (contentType != null ? contentType.getCharset() : null);
 		if (this.response.getCharacterEncoding() == null && charset != null) {
 			this.response.setCharacterEncoding(charset.name());
 		}
+		long contentLength = getHeaders().getContentLength();
+		if (contentLength != -1) {
+			this.response.setContentLengthLong(contentLength);
+		}
 	}
 
 	@Override

spring-web/src/main/java/org/springframework/http/server/reactive/TomcatHttpHandlerAdapter.java

@@ -204,7 +204,14 @@ else if (response instanceof HttpServletResponseWrapper) {
 		@Override
 		protected void applyHeaders() {
 			HttpServletResponse response = getNativeResponse();
-			MediaType contentType = getHeaders().getContentType();
+			MediaType contentType = null;
+			try {
+				contentType = getHeaders().getContentType();
+			}
+			catch (Exception ex) {
+				String rawContentType = getHeaders().getFirst(HttpHeaders.CONTENT_TYPE);
+				response.setContentType(rawContentType);
+			}
 			if (response.getContentType() == null && contentType != null) {
 				response.setContentType(contentType.toString());
 			}