diff --git a/samples/rest-notes-spring-data-rest/src/test/java/com/example/notes/ApiDocumentation.java b/samples/rest-notes-spring-data-rest/src/test/java/com/example/notes/ApiDocumentation.java
index 498eee26..cabce107 100644
--- a/samples/rest-notes-spring-data-rest/src/test/java/com/example/notes/ApiDocumentation.java
+++ b/samples/rest-notes-spring-data-rest/src/test/java/com/example/notes/ApiDocumentation.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2015 the original author or authors.
+ * Copyright 2014-2019 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.
@@ -127,8 +127,8 @@ public class ApiDocumentation {
 		createNote("REST maturity model",
 				"https://martinfowler.com/articles/richardsonMaturityModel.html");
 		createNote("Hypertext Application Language (HAL)",
-				"http://stateless.co/hal_specification.html");
-		createNote("Application-Level Profile Semantics (ALPS)", "http://alps.io/spec/");
+				"https://github.com/mikekelly/hal_specification");
+		createNote("Application-Level Profile Semantics (ALPS)", "https://github.com/alps-io/spec");
 
 		this.mockMvc.perform(get("/notes"))
 			.andExpect(status().isOk())
diff --git a/samples/rest-notes-spring-hateoas/src/test/java/com/example/notes/ApiDocumentation.java b/samples/rest-notes-spring-hateoas/src/test/java/com/example/notes/ApiDocumentation.java
index 4c72fe81..3b9983fd 100644
--- a/samples/rest-notes-spring-hateoas/src/test/java/com/example/notes/ApiDocumentation.java
+++ b/samples/rest-notes-spring-hateoas/src/test/java/com/example/notes/ApiDocumentation.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2015 the original author or authors.
+ * Copyright 2014-2019 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.
@@ -153,9 +153,9 @@ public class ApiDocumentation {
 		createNote("REST maturity model",
 				"https://martinfowler.com/articles/richardsonMaturityModel.html");
 		createNote("Hypertext Application Language (HAL)",
-				"http://stateless.co/hal_specification.html");
-		createNote("Application-Level Profile Semantics (ALPS)", "http://alps.io/spec/");
 		
+				"https://github.com/mikekelly/hal_specification");
+		createNote("Application-Level Profile Semantics (ALPS)", "https://github.com/alps-io/spec");
 		this.document.snippets(
 				responseFields(
 						fieldWithPath("_embedded.notes").description("An array of <<resources-note, Note resources>>")));
diff --git a/spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/PrettyPrintingContentModifier.java b/spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/PrettyPrintingContentModifier.java
index 8dbfaec7..67f0949d 100644
--- a/spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/PrettyPrintingContentModifier.java
+++ b/spring-restdocs-core/src/main/java/org/springframework/restdocs/operation/preprocess/PrettyPrintingContentModifier.java
@@ -82,7 +82,7 @@ public class PrettyPrintingContentModifier implements ContentModifier {
 		public byte[] prettyPrint(byte[] original) throws Exception {
 			Transformer transformer = TransformerFactory.newInstance().newTransformer();
 			transformer.setOutputProperty(OutputKeys.INDENT, "yes");
-			transformer.setOutputProperty("{https://xml.apache.org/xslt}indent-amount",
+			transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount",
 					"4");
 			transformer.setOutputProperty(OutputKeys.DOCTYPE_PUBLIC, "yes");
 			ByteArrayOutputStream transformed = new ByteArrayOutputStream();