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https://issues.apache.org/jira/browse/TS-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15056190#comment-15056190
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ASF GitHub Bot commented on TS-4042:
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Github user sudheerv commented on the pull request:
https://github.com/apache/trafficserver/pull/351#issuecomment-164477764
Cool, thanks!
> Add feature to buffer request body before making downstream requests
> --------------------------------------------------------------------
>
> Key: TS-4042
> URL: https://issues.apache.org/jira/browse/TS-4042
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core, CPP API, TS API
> Reporter: Brian Geffon
> Assignee: Brian Geffon
> Fix For: 6.1.0
>
>
> We need a way to examine the request body without making a downstream
> request, this feature has many use cases including:
> - Ability to buffer the body and ensure a full post is received before
> committing downstream resources.
> - Ability to choose an origin based on request body
> - Ability to do request content filtering such as a WAF might provide
> before the origin is involved.
> Today you have two options to inspect a request body:
> 1) Transformations: the problem with transformations is that you only start
> receiving the request bytes after a sink has been established, which in this
> case is the downstream origin.
> 2) Create an intercept and use fetch apis to then send the downstream
> request: while this technically works it turns out to be a ton of code and is
> in general pretty problematic, we actually tried this approach for a while
> and had nothing but problems with it.
> We feel it would be ideal if we could intercept the body without breaking the
> normal ATS state flow. There used to exist code (and it's still in the core
> just #ifdefed out) to drain the request body. I use that code as the basis
> for this request buffering code. We added APIs to both the C and C++ APIs so
> that this request buffering can be enabled from a plugin and the plugin can
> inspect the body as chunks arrive or when it's complete. We've included an
> example plugin that will error a transaction if a minimum rate of transfer is
> not maintained.
> I'm confident that this feature will bring plenty of questions / feedback, so
> let's get that party started.
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