When I analyze the network traffic, I can see that the client has requested Cache-Control: no-cache
GET /chromebug/124357__hoobtastic__ping.wav HTTP/1.1
Connection: keep-alive
Cache-Control: no-cache
Pragma: no-cache
Accept-Encoding: identity;q=1, *;q=0
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_2) AppleWebKit/537.22 (KHTML, like Gecko) Chrome/25.0.1364.26 Safari/537.22
Accept: */*
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: __utma=200997559.1418160322.1351250958.1351250958.1351250958.1; __utmz=200997559.1351250958.1.1.utmcsr=google|utmccn=(organic)|utmcmd=organic|utmctr=(not%20provided)
Range: bytes=0-
HTTP/1.1 206 Partial Content
Date: Wed, 09 Jan 2013 11:13:41 GMT
Server: Apache/2.2.17 (Fedora)
Last-Modified: Fri, 04 Jan 2013 00:00:43 GMT
ETag: "a3edf-697e-4d26b2bb20bc2"
Accept-Ranges: bytes
Content-Length: 27006
Content-Range: bytes 0-27005/27006
Connection: close
Content-Type: audio/x-wav
Is this by design? Is there a way to tell the audio object to cache the sound file?