Fix: GCP flush before error thrown. #1249
Merged
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This adds a new flush method called FlushBeforeRequestCompleted, instead of flushing after the request is sent like in FlushOnCompletedRequest, this flag sends the envelopes before sending the response to the user.
It's a required flow for some serverless/Faas platforms that will kill the process after flushing the HttpResponse to the receiver.
I made it internal for now and ideally in the future we could have a simple enum that will set the flush type (none, on completed, before completed).
Close #1213