Issue 1684: Chrome does not properly cache 'proxy.pac' file on Vista w/
WinHTTP AutoProxy service running, causing excessing requests and
performance penalty.
http://code.google.com/p/chromium/issues/detail?id=1684
New issue report by griffinz:
Product Version : 0.2.149.27 (1583)
URLs (if applicable) : n/a
Other browsers tested:
Add OK or FAIL after other browsers where you have tested this issue:
Safari 3: OK
Firefox 3: OK
IE 7: OK
What steps will reproduce the problem?
1. Place a "proxy.pac" file on a webserver, set Use automatic configuration
script to url of proxy.pac file, and verify service "WinHTTP Web Proxy
Auto-Discovery Service" is running.
2. Request url, example http://cnn.com/ and watch the webserver log
containg "proxy.pac" file. A request will be generated for each request,
doubling the number of requests.
3. Now stop "WinHTTP Web Proxy Auto-Discovery Service", restart chrome and
request the same page, only 1 request will be generated per session and
"Resolving proxy..." slowness will be eliminated for this case.
Please provide any additional information below. Attach a screenshot if
possible.
curl -i http://192.168.1.100/proxy.pac output:
HTTP/1.1 200 OK
Expires: Sun, 07 Sep 2008 23:36:16 GMT
Cache-Control: max-age=86400
Content-Type: application/x-ns-proxy-autoconfig
Accept-Ranges: bytes
ETag: "969089335"
Last-Modified: Mon, 27 Aug 2007 15:59:23 GMT
Content-Length: 618
Date: Sat, 06 Sep 2008 23:36:16 GMT
Server: lighttpd/1.4.19
function FindProxyForURL(url, host)
{
var host1 = host.toLowerCase();
var urll = url.toLowerCase();
// proxy rules removed for privacy.
return "DIRECT";
}
----
access log when Service is enabled:
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:37 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:37 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:38 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:38 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:38 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:38 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:38 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:38 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:39 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:39 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:39 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:39 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:39 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:40 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:40 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:40 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:40 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:40 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:41 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:41 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:41 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:41 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:41 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:41 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:42 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:42 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:42 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:42 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:39:42 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
etc... etc... 1:1 request per real request, I can only imagine how much
slower this would be over a higher latency network connection then a local
network.
with service disabled, 3 requests are browser first request and _thats_ it.
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:41:10 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "WinHttp-Autoproxy-Service/5.1"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:41:10 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "-"
192.168.1.111 192.168.1.100 - [06/Sep/2008:18:41:22 -0500] "GET /proxy.pac
HTTP/1.1" 200 618 "-" "-"
--- notes on the service itself.
What is WinHTTP Auto proxy service?
This service implements the Web Proxy Auto-Discovery (WPAD) protocol for
Windows HTTP Services (WinHTTP). WPAD is a protocol to enable an HTTP
client to automatically discover a proxy configuration. If this service is
stopped or disabled, the WPAD protocol will be executed within the HTTP
client's process instead of an external service process; there would be no
loss of functionality as a result.
Issue attributes:
Status: Unconfirmed
Owner: [EMAIL PROTECTED]
Labels: Type-Bug Pri-2 OS-All Area-Unknown
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