errata: p.272 s/request/response/

Change-Id: I470023ab54a7c079c17d4a45ad420688715d0eea

errata.html

@@ -149,11 +149,16 @@ pre {
   </p>
 
   <p>
-    <b>p.222. Exercise 8.1</b>: The port numbers for <code>London</code>
+    <b>p.222, Exercise 8.1</b>: The port numbers for <code>London</code>
     and <code>Tokyo</code> should be swapped in the final command to
     match the earlier commands.
     (Thanks to Kiyoshi Kamishima, 2016-01-08.)
   </p>
+ 
+  <p>
+    <b>p.272, ¶3</b>: for "the request body", read "the response body".
+    (Thanks to 曹春晖, 2016-01-19.)
+  </p>
 
   <p>
     <b>p.288, code display following ¶4</b>: In the import declaration, for