Consistent use of getLocalAddr() without DNS lookups in request adapters

Closes spring-projectsgh-28280

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -148,7 +148,7 @@ public Principal getPrincipal() {
 
 	@Override
 	public InetSocketAddress getLocalAddress() {
-		return new InetSocketAddress(this.servletRequest.getLocalName(), this.servletRequest.getLocalPort());
+		return new InetSocketAddress(this.servletRequest.getLocalAddr(), this.servletRequest.getLocalPort());
 	}
 
 	@Override
@@ -167,7 +167,8 @@ public InputStream getBody() throws IOException {
 	}
 
 	private boolean isFormPost(HttpServletRequest request) {
-		return (request.getContentType() != null && request.getContentType().contains(FORM_CONTENT_TYPE) &&
+		String contentType = request.getContentType();
+		return (contentType != null && contentType.contains(FORM_CONTENT_TYPE) &&
 				METHOD_POST.equalsIgnoreCase(request.getMethod()));
 	}