p. 519: To make Example 15-8 compile, you need to add a no-args constructor to the QueryString class from Chapter 7. I cut that constructor in final edits without noticing its absence would break this example.
On p. 544 in Example 15-11
package java.net
should be
package java.net;
On p. 544 in the final paragraph change
getOutputStream() to getBody().
On p. 545 in Example 15-13
public abstract class CacheRequest
should be
public abstract class CacheResponse
p. 549: In the second paragraph change Example 15-13 to Example 15-15.