You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@trafficserver.apache.org by "Bryan Call (JIRA)" <ji...@apache.org> on 2015/11/10 18:15:11 UTC
[jira] [Comment Edited] (TS-3995) "[hcoofsr] conditional request,
200 response, send back 304 if possible [crc=304]" breaks akamaihd.net live
streaming
[ https://issues.apache.org/jira/browse/TS-3995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14998912#comment-14998912 ]
Bryan Call edited comment on TS-3995 at 11/10/15 5:15 PM:
----------------------------------------------------------
Are you ignoring If-Modified-Since on the origin server? The origin looks to be broken by passing back a 200 response when the object doesn't look like it has been modified (based on the Last-Modified date).
You are violating the HTTP/1.1 protocol on the client/origin and this is going to cause problems since you need to have all other intermediaries violate the protocol the same way.
You can remove the If-Modified-Since header on ATS with the header_rewrite plugin since it looks like the origin doesn't use it. However, I think it would be best to figure out why time stamps are equal. Is the client incorrectly updated the time or is the origin updating the object in less then a second?
was (Author: bcall):
Are you ignoring If-Modified-Since on the origin server? The origin looks to be broken by passing back a 200 response when the object doesn't look like it has been modified (based on the Last-Modified date).
You are violating the HTTP/1.1 protocol on the client/origin and this is going to cause problems since you need to have all other intermediaries violate the protocol the same way.
> "[hcoofsr] conditional request, 200 response, send back 304 if possible [crc=304]" breaks akamaihd.net live streaming
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: TS-3995
> URL: https://issues.apache.org/jira/browse/TS-3995
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache, Core, HTTP
> Affects Versions: 5.3.2
> Reporter: Nikolai Gorchilov
> Labels: review
> Fix For: 6.1.0
>
>
> Caching proxy running ATS 5.3.x (5.3.0, 5.3.1, 5.3.2 all fail) with proxy.config.http.cache.when_to_revalidate = 4 breaks akamaihd.net live streaming.
> The actual problem is that ATS rewrites origin response from 200 to 304, due to If-Modified-Since conditional header in client's request. As per ATS logic object is unmodified, but in fact it is. Most probably player and server somehow play with if-modified-since/last-modified headers pair to communicate position in the live stream. What is obvious is that Last-Modified = If-Modified-Since.
> As result, Akamai player keeps repeating the said request, expecting it's 200, but getting 304 thus live video freezes forever, just a few seconds after start.
> IMHO when proxy.config.http.cache.when_to_revalidate = 4, ATS shall not interfere with origin response in this manner.
> Here's a debug log of request and response headers at different states in a single transaction:
> {noformat}
> +++++++++ Incoming Request +++++++++
> -- State Machine Id: 168
> GET http:///z/delayed/indvsa2015_INDVSSATEST1DAY1_1@336263/464_209823ecd2922291-p.bootstrap?g=YCEAMIWDQZQT&hdntl=exp=1446809835~acl=%2f*~data=hdntl~hmac=ebaedb13781605ce7f9f26b84e1346a7d43ecf0dfcc99e6b53e32487565ba3f8&hdcore=3.7.0&plugin=aasp-3.7.0.39.44 HTTP/1.1
> Host: sshds5-lh.akamaihd.net
> Connection: keep-alive
> User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36
> X-Requested-With: ShockwaveFlash/19.0.0.226
> Accept: */*
> DNT: 1
> Referer: http://www.hotstar.com/
> Accept-Encoding: gzip
> Accept-Language: en-US,en;q=0.8,bg;q=0.6
> Cookie: _alid_=PmjLqgcUUqw6TP5gtK/xbg==; hdntl=exp=1446809835~acl=%2f*~data=hdntl~hmac=ebaedb13781605ce7f9f26b84e1346a7d43ecf0dfcc99e6b53e32487565ba3f8
> If-Modified-Since: Thu, 05 Nov 2015 02:30:28 GMT
> +++++++++ Proxy's Request +++++++++
> -- State Machine Id: 168
> GET /z/delayed/indvsa2015_INDVSSATEST1DAY1_1@336263/464_209823ecd2922291-p.bootstrap?g=YCEAMIWDQZQT&hdntl=exp=1446809835~acl=%2f*~data=hdntl~hmac=ebaedb13781605ce7f9f26b84e1346a7d43ecf0dfcc99e6b53e32487565ba3f8&hdcore=3.7.0&plugin=aasp-3.7.0.39.44 HTTP/1.1
> Host: sshds5-lh.akamaihd.net
> User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36
> X-Requested-With: ShockwaveFlash/19.0.0.226
> Accept: */*
> DNT: 1
> Referer: http://www.hotstar.com/
> Accept-Encoding: gzip
> Accept-Language: en-US,en;q=0.8,bg;q=0.6
> Cookie: _alid_=PmjLqgcUUqw6TP5gtK/xbg==; hdntl=exp=1446809835~acl=%2f*~data=hdntl~hmac=ebaedb13781605ce7f9f26b84e1346a7d43ecf0dfcc99e6b53e32487565ba3f8
> If-Modified-Since: Thu, 05 Nov 2015 02:30:28 GMT
> +++++++++ Proxy's Request after hooks +++++++++
> -- State Machine Id: 168
> GET /z/delayed/indvsa2015_INDVSSATEST1DAY1_1@336263/464_209823ecd2922291-p.bootstrap?g=YCEAMIWDQZQT&hdntl=exp=1446809835~acl=%2f*~data=hdntl~hmac=ebaedb13781605ce7f9f26b84e1346a7d43ecf0dfcc99e6b53e32487565ba3f8&hdcore=3.7.0&plugin=aasp-3.7.0.39.44 HTTP/1.1
> Host: sshds5-lh.akamaihd.net
> User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36
> X-Requested-With: ShockwaveFlash/19.0.0.226
> Accept: */*
> DNT: 1
> Referer: http://www.hotstar.com/
> Accept-Encoding: gzip
> Accept-Language: en-US,en;q=0.8,bg;q=0.6
> Cookie: _alid_=PmjLqgcUUqw6TP5gtK/xbg==; hdntl=exp=1446809835~acl=%2f*~data=hdntl~hmac=ebaedb13781605ce7f9f26b84e1346a7d43ecf0dfcc99e6b53e32487565ba3f8
> If-Modified-Since: Thu, 05 Nov 2015 02:30:28 GMT
> +++++++++ Incoming O.S. Response +++++++++
> -- State Machine Id: 168
> HTTP/1.1 200 OK
> Server: AkamaiGHost
> Mime-Version: 1.0
> Content-Type: video/abst
> Content-Length: 122
> Last-Modified: Thu, 05 Nov 2015 02:30:28 GMT
> Expires: Thu, 05 Nov 2015 11:38:01 GMT
> Cache-Control: max-age=0, no-cache
> Pragma: no-cache
> Date: Thu, 05 Nov 2015 11:38:01 GMT
> Connection: keep-alive
> Set-Cookie: _alid_=PmjLqgcUUqw6TP5gtK/xbg==; path=/z/delayed/indvsa2015_INDVSSATEST1DAY1_1@336263/; domain=sshds5-lh.akamaihd.net
> +++++++++ Base Header for Building Response +++++++++
> -- State Machine Id: 168
> HTTP/1.1 200 OK
> Server: AkamaiGHost
> Mime-Version: 1.0
> Content-Type: video/abst
> Content-Length: 122
> Last-Modified: Thu, 05 Nov 2015 02:30:28 GMT
> Expires: Thu, 05 Nov 2015 11:38:01 GMT
> Cache-Control: max-age=0, no-cache
> Pragma: no-cache
> Date: Thu, 05 Nov 2015 11:38:01 GMT
> Connection: keep-alive
> Set-Cookie: _alid_=PmjLqgcUUqw6TP5gtK/xbg==; path=/z/delayed/indvsa2015_INDVSSATEST1DAY1_1@336263/; domain=sshds5-lh.akamaihd.net
> +++++++++ Proxy's Response 2 +++++++++
> -- State Machine Id: 168
> HTTP/1.1 304 Not Modified
> Date: Thu, 05 Nov 2015 11:38:01 GMT
> Expires: Thu, 05 Nov 2015 11:38:01 GMT
> Cache-Control: max-age=0, no-cache
> Connection: keep-alive
> +++++++++ Proxy's Response (Client Conditionals) +++++++++
> -- State Machine Id: 168
> HTTP/1.1 304 Not Modified
> Date: Thu, 05 Nov 2015 11:38:01 GMT
> Expires: Thu, 05 Nov 2015 11:38:01 GMT
> Cache-Control: max-age=0, no-cache
> Connection: keep-alive
> {noformat}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)