Summary

Add DaprClient.invokeHttpClient(appId) — an SDK-native factory that returns an HTTP client preconfigured for Dapr service invocation, as the successor to the invokeMethod(...) overloads deprecated by #1666.

Motivation

After #1666, every DaprClient.invokeMethod(...) overload is @Deprecated, with the javadoc telling users to "use language-native HTTP clients or gRPC clients for service invocation instead." However, the SDK provides no SDK-native replacement, so any user who wants to keep going through DaprClient must hand-roll:

• Dapr endpoint/port resolution,
• /v1.0/invoke/<app-id>/method/<method> URL composition,
• dapr-api-token header injection,
• and the lifecycle of their own java.net.http.HttpClient.

The .NET SDK already solves this with DaprClient.CreateInvokeHttpClient(appId), which returns a System.Net.Http.HttpClient whose BaseAddress is the Dapr invoke prefix for the target app and which auto-attaches the api token — letting users write await httpClient.GetAsync("weatherforecast") directly.

Proposed API

DaprInvokeHttpClient invoker = daprClient.invokeHttpClient("orderprocessor");

HttpRequest request = invoker.newRequestBuilder("orders")
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString(json))
    .build();

HttpResponse<String> response = invoker.send(request, HttpResponse.BodyHandlers.ofString());

The returned DaprInvokeHttpClient:

• resolves relative paths against {daprHttpEndpoint}/v1.0/invoke/{appId}/method/,
• attaches the dapr-api-token header when configured,
• reuses the SDK's shared java.net.http.HttpClient (no extra lifecycle for the caller),
• and exposes the underlying httpClient() and baseUri() as escape hatches.

References

• Deprecated by: chore: Deprecate invoke methods #1666
• Implemented in: feat: add DaprClient.invokeHttpClient(appId) factory #1742
• Inspired by .NET's DaprClient.CreateInvokeHttpClient(appId).

Release Note

RELEASE NOTE: ADD DaprClient.invokeHttpClient(appId) factory — an SDK-native HTTP client preconfigured for service invocation, mirroring .NET's CreateInvokeHttpClient and serving as the successor to the deprecated invokeMethod APIs.