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[1.16] Adds note about new Service Invocation headers (#4819) 

* [1.16] Adds not about new SA headers

Adds docs on Service Invocation app ID & namespace headers.

Fixes https://github.com/dapr/docs/issues/4816

Signed-off-by: joshvanl <me@joshvanl.dev>

* Fixes the headers in the service invocation calls

Signed-off-by: joshvanl <me@joshvanl.dev>

---------

Signed-off-by: joshvanl <me@joshvanl.dev>
Co-authored-by: Mark Fussell <markfussell@gmail.com>
Co-authored-by: Marc Duiker <marcduiker@users.noreply.github.com>
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Josh van Leeuwen 2025-08-29 01:59:50 -03:00 committed by GitHub
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daprdocs/content/en/reference/api/service_invocation_api.md
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@ -134,6 +134,18 @@ In case you are invoking `mathService` on a different namespace, you can use the
In this URL, `testing` is the namespace that `mathService` is running in.
### Headers in Service Invocation Requests
When Dapr invokes a service, it automatically adds the following headers to the request:
| Header | Description | Example |
|--------|-------------|---------|
| `dapr-caller-app-id` | The ID of the calling application | `myapp` |
| `dapr-caller-namespace` | The namespace of the calling application | `production` |
| `dapr-callee-app-id` | The ID of the called application | `mathService` |
These headers are available in both HTTP and gRPC service invocation requests.
#### Non-Dapr Endpoint Example
If the `mathService` service was a non-Dapr application, then it could be invoked using service invocation via an `HTTPEndpoint`, as well as a Fully Qualified Domain Name (FQDN) URL.