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https://issues.apache.org/jira/browse/TS-1125?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13507359#comment-13507359
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Jan-Frode Myklebust commented on TS-1125:
-----------------------------------------
It seems to be waiting more than a little while. We see a full 2 second delay
for POST with large responses from origin server, on ATS 3.2.3.
> POST's with Expect: 100-continue are slowed by delayed 100 response.
> --------------------------------------------------------------------
>
> Key: TS-1125
> URL: https://issues.apache.org/jira/browse/TS-1125
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Affects Versions: 3.0.2
> Environment: TS 3.0.2 going to Apache 2.2 web server
> Reporter: William Bardwell
> Priority: Minor
> Fix For: 3.3.1
>
>
> Sending a post like:
> POST / HTTP/1.1
> Host: www.example.com
> Content-Length: 10
> Expect: 100-continue
> directly to the web server immediately sends back:
> HTTP/1.1 100 Continue
> And then when the post data is sent, a status 200 response comes back.
> But when going through ATS the "HTTP/1.1 100 Continue" is not sent
> immediately, and instead is sent after the POST data has been received. This
> is legal, but it makes clients that are hoping for a 100 continue to wait a
> little while hoping to get that, ATS should forward that response through
> immediately.
> Note: I see curl using "Expect: 100-continue" with > 1024 bytes of post data,
> but web searching indicates that some Microsoft products also use it.
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