Github user ushachar commented on the issue: https://github.com/apache/trafficserver/pull/712 The reason for wanting this feature is to support prolonged content related actions -- in @davidbz case out-of-process content malware analysis. When acting as a forward proxy and handling a request for a very large file, he needs to support an initial analysis on the first N MBs of the file in order to decide if he must analyze the full file or can release it to the client. This analysis can take a significant amount of time and continuing to buffer the contents can lead to resource exhaustion. (When combined with turning on flow control to make sure that we throttle the proxy<->upstream tcp connection) @bgaff - I know you had some concerns regarding this - does this use case seem reasonable to you?
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