Update DurableClientContext.createCheckStatusResponse to return 202 (#93)

* Updated DurableClientContext.createCheckStatusResponse to return 202

* Updated CHANGELOG.md

Author: shreyas-gopalakrishna

CHANGELOG.md

@@ -16,5 +16,6 @@
 ### Breaking changes
 
 * Use java worker middleware to avoid wrapper method when create orchestrator function ([#87](https://github.com/microsoft/durabletask-java/pull/87))
+* Fixed DurableClientContext.createCheckStatusResponse to return 202 ([#92](https://github.com/microsoft/durabletask-java/pull/92))
 
 * to be updated

azurefunctions/src/main/java/com/microsoft/durabletask/azurefunctions/DurableClientContext.java

@@ -70,8 +70,8 @@ public HttpResponseMessage createCheckStatusResponse(HttpRequestMessage<?> reque
 
         String instanceStatusURL = baseUrl + "/runtime/webhooks/durabletask/instances/" + encodedInstanceId;
 
-        // Construct the response as an HTTP 201 with a JSON object payload
-        return request.createResponseBuilder(HttpStatus.CREATED)
+        // Construct the response as an HTTP 202 with a JSON object payload
+        return request.createResponseBuilder(HttpStatus.ACCEPTED)
                 .header("Location", instanceStatusURL + "?" + this.requiredQueryStringParameters)
                 .header("Content-Type", "application/json")
                 .body(new HttpCreateCheckStatusResponse(