我在提供 CORS 请求之间遇到了延迟，但可以正常处理直接请求。我正在使用它通过 HTTP 分发媒体流，因此减少启动延迟非常重要。
从通过 CloudFront 分配（通过来自浏览器或 curl 的直接请求）提供媒体清单到我们网站上的播放器发出的 CORS 请求返回成功之间大约有 90-180 秒。我已经在 CloudFront 分配中启用了 OPTIONS 请求转发，并且也包含了 OPTIONS 请求的结果。我在下面的 Chrome 开发工具中包含了 curl 请求的结果和网络选项卡的相应结果。请注意，这些请求是在 15 秒内从同一客户端发出的（首先发送 curl 请求）。
=== CURL 请求 ===
* Trying 54.192.135.101...
* Connected to <exampleDistributionID>.cloudfront.net (1.1.1.1) port 443 (#0)
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
* CAfile: /opt/local/share/curl/curl-ca-bundle.crt
CApath: none
* TLSv1.2 (OUT), TLS header, Certificate Status (22):
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Client hello (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use http/1.1
* Server certificate:
* subject: C=US; ST=Washington; L=Seattle; O=Amazon.com, Inc.; CN=*.cloudfront.net
* start date: Sep 17 00:00:00 2015 GMT
* expire date: Dec 15 23:59:59 2016 GMT
* subjectAltName: <exampleDistributionID>.cloudfront.net matched
* issuer: C=US; O=Symantec Corporation; OU=Symantec Trust Network; CN=Symantec Class 3 Secure Server CA - G4
* SSL certificate verify ok.
> GET /path/to/manifest/stream.m3u8 HTTP/1.1
> Host: <exampleDistributionID>.cloudfront.net
> User-Agent: curl/7.47.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Type: application/vnd.apple.mpegurl
< Content-Length: 1435
< Connection: keep-alive
< Server: nginx/1.9.10
< Date: Sun, 17 Apr 2016 00:26:06 GMT
< Last-Modified: Sun, 17 Apr 2016 00:26:05 GMT
< ETag: "5712d81d-59b"
< Cache-Control: no-cache
< Access-Control-Allow-Origin: *
< Accept-Ranges: bytes
< X-Cache: Miss from cloudfront
< Via: 1.1 f687c6e8ce478528ab87681ac35779ab.cloudfront.net (CloudFront)
< X-Amz-Cf-Id: P01_dDWZRWZ0lzAqROqOMnaipstK484vPWnicw3F0kcG_7elxBGNkQ==
<...Content of stream.m3u8...>
===Chrome 请求===
显示收到的 404 错误的 Chrome 开发工具网络选项卡的屏幕截图
===选项请求===
* Trying 1.1.1.1...
* Connected to <exampleDistributionID>.cloudfront.net (1.1.1.1) port 443 (#0)
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
* CAfile: /opt/local/share/curl/curl-ca-bundle.crt
CApath: none
* TLSv1.2 (OUT), TLS header, Certificate Status (22):
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Client hello (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use http/1.1
* Server certificate:
* subject: C=US; ST=Washington; L=Seattle; O=Amazon.com, Inc.; CN=*.cloudfront.net
* start date: Sep 17 00:00:00 2015 GMT
* expire date: Dec 15 23:59:59 2016 GMT
* subjectAltName: <exampleDistributionID>.cloudfront.net matched
* issuer: C=US; O=Symantec Corporation; OU=Symantec Trust Network; CN=Symantec Class 3 Secure Server CA - G4
* SSL certificate verify ok.
> OPTIONS /path/to/manifest/stream.m3u8 HTTP/1.1
> Host: <exampleDistributionID>.cloudfront.net
> User-Agent: curl/7.47.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Content-Type: text/plain
< Content-Length: 0
< Connection: keep-alive
< Server: nginx/1.9.10
< Date: Sun, 17 Apr 2016 22:05:15 GMT
< Access-Control-Allow-Origin: http://my.origin.com
< Access-Control-Allow-Methods: GET, OPTIONS
< Access-Control-Allow-Headers: Authorization
< Access-Control-Allow-Credentials: true
< X-Cache: Miss from cloudfront
< Via: 1.1 ed2825b48bb51b4febd93a82e71f7ed9.cloudfront.net (CloudFront)
< X-Amz-Cf-Id: WY-KPfTlNTenTjWyYF9GS4ikyrGMQONAm4mXpbuKpHzfBk_xKfxG2w==
<
* Connection #0 to host <exampleDistributionID>.cloudfront.net left intact
不知所措地看到我的配置中的错误，任何帮助将不胜感激。