[jira] [Updated] (TS-4042) Add feature to buffer request body before making downstream requests

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TS-4042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leif Hedstrom updated TS-4042:
------------------------------
    Fix Version/s:     (was: 7.0.0)
                   7.1.0

> 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: Thomas Jackson
>             Fix For: 7.1.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> 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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