Added more headers.

org.springframework.web/src/main/java/org/springframework/http/HttpHeaders.java

@@ -61,6 +61,8 @@ public class HttpHeaders implements MultiValueMap<String, String> {
 
 	private static final String ALLOW = "Allow";
 
+	private static final String CACHE_CONTROL = "Cache-Control";
+
 	private static final String CONTENT_LENGTH = "Content-Length";
 
 	private static final String CONTENT_TYPE = "Content-Type";
@@ -71,12 +73,16 @@ public class HttpHeaders implements MultiValueMap<String, String> {
 
 	private static final String EXPIRES = "Expires";
 
+	private static final String IF_MODIFIED_SINCE = "If-Modified-Since";
+
 	private static final String IF_NONE_MATCH = "If-None-Match";
 
 	private static final String LAST_MODIFIED = "Last-Modified";
 
 	private static final String LOCATION = "Location";
 
+	private static final String PRAGMA = "Pragma";
+
 
 	private static final String[] DATE_FORMATS = new String[] {
 		"EEE, dd MMM yyyy HH:mm:ss zzz",
@@ -175,6 +181,22 @@ public class HttpHeaders implements MultiValueMap<String, String> {
 		}
 	}
 
+	/**
+	 * Sets the (new) value of the {@code Cache-Control} header.
+	 * @param cacheControl the value of the header
+	 */
+	public void setCacheControl(String cacheControl) {
+		set(CACHE_CONTROL, cacheControl);
+	}
+
+	/**
+	 * Returns the value of the {@code Cache-Control} header.
+	 * @return the value of the header
+	 */
+	public String getCacheControl() {
+		return getFirst(CACHE_CONTROL);
+	}
+
 	/**
 	 * Set the length of the body in bytes, as specified by the {@code Content-Length} header.
 	 * @param contentLength the content length
@@ -266,6 +288,24 @@ public class HttpHeaders implements MultiValueMap<String, String> {
 		return getFirstDate(EXPIRES);
 	}
 
+	/**
+	 * Sets the (new) value of the {@code If-Modified-Since} header.
+	 * <p>The date should be specified as the number of milliseconds since January 1, 1970 GMT.
+	 * @param ifModifiedSince the new value of the header
+	 */
+	public void setIfModifiedSince(long ifModifiedSince) {
+		setDate(IF_MODIFIED_SINCE, ifModifiedSince);
+	}
+
+	/**
+	 * Returns the value of the {@code IfModifiedSince} header.
+	 * <p>The date is returned as the number of milliseconds since January 1, 1970 GMT. Returns -1 when the date is unknown.
+	 * @return the header value
+	 */
+	public long getIfNotModifiedSince() {
+		return getFirstDate(IF_MODIFIED_SINCE);
+	}
+
 	/**
 	 * Sets the (new) value of the {@code If-None-Match} header.
 	 * @param ifNoneMatch the new value of the header
@@ -343,6 +383,22 @@ public class HttpHeaders implements MultiValueMap<String, String> {
 		return (value != null ? URI.create(value) : null);
 	}
 
+	/**
+	 * Sets the (new) value of the {@code Pragma} header.
+	 * @param pragma the value of the header
+	 */
+	public void setPragma(String pragma) {
+		set(PRAGMA, pragma);
+	}
+
+	/**
+	 * Returns the value of the {@code Pragma} header.
+	 * @return the value of the header
+	 */
+	public String getPragma() {
+		return getFirst(PRAGMA);
+	}
+
 	// Utility methods
 
 	private String quote(String s) {

org.springframework.web/src/test/java/org/springframework/http/HttpHeadersTests.java

@@ -167,4 +167,32 @@ public class HttpHeadersTests {
 		assertEquals("Invalid Expires header", "Thu, 18 Dec 2008 10:20:00 GMT", headers.getFirst("expires"));
 	}
 
+	@Test
+	public void ifModifiedSince() {
+		Calendar calendar = new GregorianCalendar(2008, 11, 18, 11, 20);
+		calendar.setTimeZone(TimeZone.getTimeZone("CET"));
+		long date = calendar.getTimeInMillis();
+		headers.setIfModifiedSince(date);
+		assertEquals("Invalid If-Modified-Since header", date, headers.getIfNotModifiedSince());
+		assertEquals("Invalid If-Modified-Since header", "Thu, 18 Dec 2008 10:20:00 GMT", headers.getFirst("if-modified-since"));
+	}
+
+	@Test
+	public void pragma() {
+		String pragma = "no-cache";
+		headers.setPragma(pragma);
+		assertEquals("Invalid Pragma header", pragma, headers.getPragma());
+		assertEquals("Invalid Pragma header", "no-cache", headers.getFirst("pragma"));
+	}
+
+	@Test
+	public void cacheControl() {
+		String cacheControl = "no-cache";
+		headers.setCacheControl(cacheControl);
+		assertEquals("Invalid Cache-Control header", cacheControl, headers.getCacheControl());
+		assertEquals("Invalid Cache-Control header", "no-cache", headers.getFirst("cache-control"));
+	}
+
+
+
 }