Chrome和Firefox CORS AJAX调用在一些Mac电脑上被中止

Question

我们在 www.saddleback.com/live 有一个网页，铬和火狐CORS AJAX呼叫在某些Mac机器上中止。在装有 OSX 10.9（最新更新）、铬和火狐（具有最新更新）的 Mac 上，AJAX 会调用 http://api.saddleback.com/WorshipService?version=2

这种行为是孤立的，但在某些机器上可以重现，而在其他机器上则不行。我们有其他Mac电脑，它们有相同的操作系统和浏览器版本，可以成功打开网页。

我已验证 Web 服务器在 500 毫秒内成功响应了 AJAX 请求。然而，Chrome一直等待大约30秒的响应，并最终中止了通话。我在下面包含了失败呼叫的 chrome://net-internals：

11645: URL_REQUEST
http://api.saddleback.com/WorshipService?version=2&null&_=1386201207191
Start Time: 2013-12-04 15:53:27.469

t=1386201207469 [st=    0] +REQUEST_ALIVE  [dt=30398]
t=1386201207470 [st=    1]   +URL_REQUEST_START_JOB  [dt=30397]
                              --> load_flags = 143540480 (DO_NOT_SAVE_COOKIES | DO_NOT_SEND_AUTH_DATA | DO_NOT_SEND_COOKIES | ENABLE_LOAD_TIMING | MAYBE_USER_GESTURE | REPORT_RAW_HEADERS | VERIFY_EV_CERT)
                              --> method = "GET"
                              --> priority = 2
                              --> url = "http://api.saddleback.com/WorshipService?version=2&null&_=1386201207191"
t=1386201207470 [st=    1]      HTTP_CACHE_GET_BACKEND  [dt=0]
t=1386201207470 [st=    1]      HTTP_CACHE_OPEN_ENTRY  [dt=0]
                                --> net_error = -2 (ERR_FAILED)
t=1386201207470 [st=    1]      HTTP_CACHE_CREATE_ENTRY  [dt=0]
t=1386201207470 [st=    1]      HTTP_CACHE_ADD_TO_ENTRY  [dt=0]
t=1386201207470 [st=    1]     +HTTP_STREAM_REQUEST  [dt=2]
t=1386201207472 [st=    3]        HTTP_STREAM_REQUEST_BOUND_TO_JOB
                                  --> source_dependency = 11647 (HTTP_STREAM_JOB)
t=1386201207472 [st=    3]     -HTTP_STREAM_REQUEST
t=1386201207472 [st=    3]     +HTTP_TRANSACTION_SEND_REQUEST  [dt=0]
t=1386201207472 [st=    3]        HTTP_TRANSACTION_SEND_REQUEST_HEADERS
                                  --> GET /WorshipService?version=2&null&_=1386201207191 HTTP/1.1
                                      Host: api.saddleback.com
                                      Connection: keep-alive
                                      Accept: application/json, text/javascript, */*; q=0.01
                                      Origin: http://www.saddleback.com
                                      User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
                                      Content-Type: application/json
                                      Referer: http://www.saddleback.com/onlinecampus/
                                      Accept-Encoding: gzip,deflate,sdch
                                      Accept-Language: en-US,en;q=0.8
t=1386201207472 [st=    3]     -HTTP_TRANSACTION_SEND_REQUEST
t=1386201207472 [st=    3]     +HTTP_TRANSACTION_READ_HEADERS  [dt=30395]
t=1386201207472 [st=    3]       +HTTP_STREAM_PARSER_READ_HEADERS  [dt=30395]
t=1386201237867 [st=30398]          CANCELLED
t=1386201237867 [st=30398]   -URL_REQUEST_START_JOB
                              --> net_error = -3 (ERR_ABORTED)
t=1386201237867 [st=30398] -REQUEST_ALIVE

以下是Wireshark的请求和响应：

请求

GET /WorshipService?version=2&null&_=1386192341441 HTTP/1.1
    [Expert Info (Chat/Sequence): GET /WorshipService?version=2&null&_=1386192341441 HTTP/1.1]
        [Message: GET /WorshipService?version=2&null&_=1386192341441 HTTP/1.1]
        [Severity level: Chat]
        [Group: Sequence]
    Request Method: GET
    Request URI: /WorshipService?version=2&null&_=1386192341441
    Request Version: HTTP/1.1
Host: api.saddleback.com
Connection: keep-alive
Cache-Control: max-age=0
Accept: application/json, text/javascript, */*; q=0.01
Origin: http://www.saddleback.com
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36
Content-Type: application/json
Referer: http://www.saddleback.com/onlinecampus/
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8

响应

HTTP/1.1 200 OK
    [Expert Info (Chat/Sequence): HTTP/1.1 200 OK]
        [Message: HTTP/1.1 200 OK]
        [Severity level: Chat]
        [Group: Sequence]
    Request Version: HTTP/1.1
    Status Code: 200
    Response Phrase: OK
Cache-Control: no-cache
Pragma: no-cache
Content-Type: application/json; charset=utf-8
Expires: -1
Server: Microsoft-IIS/7.5
Access-Control-Allow-Origin: http://www.saddleback.com
Access-Control-Allow-Credentials: true
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Wed, 04 Dec 2013 21:25:41 GMT
Content-Length: 2841
    [Content length: 2841]
Set-Cookie: NSC_ndxfc1-45*80=ffffffffaf181c9545525d5f4f58455e445a4a423660;expires=Wed, 04-Dec-2013 14:44:34 GMT;path=/;httponly

我花了太多时间试图找出为什么这在一些Mac配置上失败了，而在其他配置上却没有。任何帮助都将不胜感激。

Answer 1

在花了很长时间查看低级网络数据包后，尝试查找问题。结果病毒扫描程序阻止了通话。关闭web扫描后，它开始工作。

简而言之，索福斯在火狐浏览器和Chrome上屏蔽了 api.saddleback.com，但在野生动物园上却没有。去图。