In what area(s)?

/area runtime

What version of Dapr?

1.10.x
current master

Description

The feature flag ServiceInvocationStreaming was added in 1.10 and should enable:

• Using CallLocalStream for sidecar-to-sidecar communication
• Responses from onDirectMessage return data as a stream

It appears that the second thing isn't actually working.

This seems to be related to the fact that when the HTTP API object is initialized (here), this line was not included:

IsStreamingEnabled: a.globalConfig.IsFeatureEnabled(config.ServiceInvocationStreaming),

Sadly, adding the line above isn't the end of the issue. Because HTTP requests go through a conversion from fasthttp to net/http (for applying the middlewares), and then back to fasthttp, when a handler calls reqCtx.Hijack() (which is necessary to use streaming), that is then lost. So setting IsStreamingEnabled would actually cause no data to be returned to the client.