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https://issues.apache.org/jira/browse/TS-1381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13648587#comment-13648587
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Leif Hedstrom commented on TS-1381:
-----------------------------------
Note that is probably a general case for all transforms too, who also depend on
the chunked transform.
> Performance of server intercept without Content-Length is poor
> --------------------------------------------------------------
>
> Key: TS-1381
> URL: https://issues.apache.org/jira/browse/TS-1381
> Project: Traffic Server
> Issue Type: Improvement
> Components: HTTP
> Reporter: Leif Hedstrom
> Fix For: 3.5.0
>
>
> When using a server intercept plugin, if the plugin is unable (for whatever
> reason) to inject a Content-Length header, we perform chunked encoding on the
> body. This turns out to be pretty slow, I'm seeing at least 5-8x slowdown
> doing this chunking, vs simply setting a CL: header.
> The reason I'm filing this is because for certain server intercept plugins,
> such as an fcgi plugin, this could be bad for performance. I can see that
> there would be some overhead doing the chunking, but 800% seems very steep.
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