Calling sdk's invokeMethod raise DaprException: UNKNOWN: HTTP status code: 400

[jxs1211]

HI
I recently upgrade dapr from 1.15.12 to 1.16.8, but encounter the issue when do service invocation in Java like:

        Map<String, String> headers = buildHeaders();
        log.info("Invoking search service global search. Headers: {}", headers);
        HttpExtension httpExtension = new HttpExtension(io.dapr.client.DaprHttp.HttpMethods.POST, null, headers);
        log.info("Invoking search service global search. Request: {}", request);
        log.info("Invoking search service global search. HttpExtension: {}", httpExtension);
        log.info("Invoking search service global search. Method: {}", trimLeadingSlash(apiPrefix) + "/global");
        JsonNode json = daprClient.invokeMethod(
                searchServiceAppId,
                trimLeadingSlash(apiPrefix) + "/global",
                request,
                httpExtension,
                JsonNode.class
        ).block(Duration.ofMillis(invokeTimeoutMs));

the caller's log print out error:

2026-02-13 16:49:22.531    
io.dapr.exceptions.DaprException: UNKNOWN: HTTP status code: 400
    2026-02-13 16:49:22.531    
    2026-02-13 16:49:22.531    
2026-02-13T08:49:22.500Z ERROR 1 --- [user-service] [nio-8080-exec-4] c.t.u.client.DaprDeviceServiceClient     : Error creating device for operator jiaming-operator via Dapr: UNKNOWN: HTTP status code: 400

the callee has no log, I have no idea how and why the issue happen after the dapr upgrade(the code works before) and other sdk like python works as intended. I test the code in local env successfully, but failed with the error in k8s. Any idear for that, appreciated.

Expected Behavior

Java sdk's service invocation works well as 1.15.12

Actual Behavior

2026-02-13 16:49:22.531
io.dapr.exceptions.DaprException: UNKNOWN: HTTP status code: 400
2026-02-13 16:49:22.531
2026-02-13 16:49:22.531
2026-02-13T08:49:22.500Z ERROR 1 --- [user-service] [nio-8080-exec-4] c.t.u.client.DaprDeviceServiceClient : Error creating device for operator jiaming-operator via Dapr: UNKNOWN: HTTP status code: 400

Steps to Reproduce the Problem

• upgrade dapr to 1.16.8
• re-deploy service
• call service API with java sdk (1.16.1) in application

Release Note