refactor(proxy/http): a concrete orig_proto
error
#3901
Merged
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this commit introduces a concrete error type for the
orig_proto
upgrade layer.this layer is used by the proxy's http client to transparently upgrade outbound http/1 traffic to http/2. rather than boxing errors, we define a concrete error type to facilitate inspecting errors in the future.
for now, the top-level http client continues to box errors thrown by the "orig_proto" upgrade client.
nb: this is based upon #3894.