diff --git a/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java b/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java
index 3c47048d56..5ac0c59f36 100644
--- a/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java
+++ b/spring-test/src/main/java/org/springframework/mock/web/MockHttpServletRequest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -101,7 +101,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 			new BufferedReader(new StringReader(""));
 
 	/**
-	 * Date formats as specified in the HTTP RFC
+	 * Date formats as specified in the HTTP RFC.
 	 * @see <a href="https://tools.ietf.org/html/rfc7231#section-7.1.1.1">Section 7.1.1.1 of RFC 7231</a>
 	 */
 	private static final String[] DATE_FORMATS = new String[] {
@@ -510,7 +510,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	}
 
 	/**
-	 * Adds all provided parameters <strong>without</strong> replacing any
+	 * Add all provided parameters <strong>without</strong> replacing any
 	 * existing values. To replace existing values, use
 	 * {@link #setParameters(java.util.Map)}.
 	 */
@@ -540,7 +540,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	}
 
 	/**
-	 * Removes all existing parameters.
+	 * Remove all existing parameters.
 	 */
 	public void removeAllParameters() {
 		this.parameters.clear();
@@ -702,8 +702,8 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	/**
 	 * Set the list of preferred locales, in descending order, effectively replacing
 	 * any existing locales.
-	 * @see #addPreferredLocale
 	 * @since 3.2
+	 * @see #addPreferredLocale
 	 */
 	public void setPreferredLocales(List<Locale> locales) {
 		Assert.notEmpty(locales, "Locale list must not be empty");
@@ -890,9 +890,9 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	}
 
 	/**
-	 * Add a header entry for the given name.
-	 * <p>While this method can take any {@code Object} as a parameter, it
-	 * is recommended to use the following types:
+	 * Add an HTTP header entry for the given name.
+	 * <p>While this method can take any {@code Object} as a parameter,
+	 * it is recommended to use the following types:
 	 * <ul>
 	 * <li>String or any Object to be converted using {@code toString()}; see {@link #getHeader}.</li>
 	 * <li>String, Number, or Date for date headers; see {@link #getDateHeader}.</li>
@@ -931,6 +931,15 @@ public class MockHttpServletRequest implements HttpServletRequest {
 		}
 	}
 
+	/**
+	 * Remove already registered entries for the specified HTTP header, if any.
+	 * @since 4.3.20
+	 */
+	public void removeHeader(String name) {
+		Assert.notNull(name, "Header name must not be null");
+		this.headers.remove(name);
+	}
+
 	/**
 	 * Return the long timestamp for the date header with the given {@code name}.
 	 * <p>If the internal value representation is a String, this method will try
@@ -1164,7 +1173,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	public String changeSessionId() {
 		Assert.isTrue(this.session != null, "The request does not have a session");
 		if (this.session instanceof MockHttpSession) {
-			return ((MockHttpSession) session).changeSessionId();
+			return ((MockHttpSession) this.session).changeSessionId();
 		}
 		return this.session.getId();
 	}
diff --git a/spring-web/src/test/java/org/springframework/mock/web/test/MockHttpServletRequest.java b/spring-web/src/test/java/org/springframework/mock/web/test/MockHttpServletRequest.java
index c1b9934515..733a258808 100644
--- a/spring-web/src/test/java/org/springframework/mock/web/test/MockHttpServletRequest.java
+++ b/spring-web/src/test/java/org/springframework/mock/web/test/MockHttpServletRequest.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -101,7 +101,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 			new BufferedReader(new StringReader(""));
 
 	/**
-	 * Date formats as specified in the HTTP RFC
+	 * Date formats as specified in the HTTP RFC.
 	 * @see <a href="https://tools.ietf.org/html/rfc7231#section-7.1.1.1">Section 7.1.1.1 of RFC 7231</a>
 	 */
 	private static final String[] DATE_FORMATS = new String[] {
@@ -510,7 +510,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	}
 
 	/**
-	 * Adds all provided parameters <strong>without</strong> replacing any
+	 * Add all provided parameters <strong>without</strong> replacing any
 	 * existing values. To replace existing values, use
 	 * {@link #setParameters(java.util.Map)}.
 	 */
@@ -540,7 +540,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	}
 
 	/**
-	 * Removes all existing parameters.
+	 * Remove all existing parameters.
 	 */
 	public void removeAllParameters() {
 		this.parameters.clear();
@@ -702,8 +702,8 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	/**
 	 * Set the list of preferred locales, in descending order, effectively replacing
 	 * any existing locales.
-	 * @see #addPreferredLocale
 	 * @since 3.2
+	 * @see #addPreferredLocale
 	 */
 	public void setPreferredLocales(List<Locale> locales) {
 		Assert.notEmpty(locales, "Locale list must not be empty");
@@ -890,9 +890,9 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	}
 
 	/**
-	 * Add a header entry for the given name.
-	 * <p>While this method can take any {@code Object} as a parameter, it
-	 * is recommended to use the following types:
+	 * Add an HTTP header entry for the given name.
+	 * <p>While this method can take any {@code Object} as a parameter,
+	 * it is recommended to use the following types:
 	 * <ul>
 	 * <li>String or any Object to be converted using {@code toString()}; see {@link #getHeader}.</li>
 	 * <li>String, Number, or Date for date headers; see {@link #getDateHeader}.</li>
@@ -931,6 +931,15 @@ public class MockHttpServletRequest implements HttpServletRequest {
 		}
 	}
 
+	/**
+	 * Remove already registered entries for the specified HTTP header, if any.
+	 * @since 4.3.20
+	 */
+	public void removeHeader(String name) {
+		Assert.notNull(name, "Header name must not be null");
+		this.headers.remove(name);
+	}
+
 	/**
 	 * Return the long timestamp for the date header with the given {@code name}.
 	 * <p>If the internal value representation is a String, this method will try
@@ -1164,7 +1173,7 @@ public class MockHttpServletRequest implements HttpServletRequest {
 	public String changeSessionId() {
 		Assert.isTrue(this.session != null, "The request does not have a session");
 		if (this.session instanceof MockHttpSession) {
-			return ((MockHttpSession) session).changeSessionId();
+			return ((MockHttpSession) this.session).changeSessionId();
 		}
 		return this.session.getId();
 	}