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book/http.md

@@ -988,8 +988,10 @@ the `Connection: close` header (send `Connection: keep-alive` instead).
 When reading the body from the socket, only read as many bytes as given
 in the `Content-Length` header and don't close the socket afterward.
 Instead, save the socket, and if another request is made to the same server
-reuse the same socket instead of creating a new one. This will speed up repeated
-requests to the same server, which are common.
+reuse the same socket instead of creating a new one. 
+(You'll also need to pass the `"rb"` option to `makefile` or the value reported
+by `Content-Length` might not match the length of the string you're reading.)
+This will speed up repeated requests to the same server, which are common.
 
 1-7 *Redirects*. Error codes in the 300 range request a redirect. When
 your browser encounters one, it should make a new request to the URL