Add a default value for httpVersion

datadog/resource_datadog_synthetics_test_.go

@@ -1284,6 +1284,7 @@ func syntheticsFollowRedirectsOption() *schema.Schema {
 func syntheticsHttpVersionOption() *schema.Schema {
 	return &schema.Schema{
 		Description:      "HTTP version to use for an HTTP request in an API test or step.",
+		Default:          datadogV1.SYNTHETICSTESTOPTIONSHTTPVERSION_ANY,
 		Type:             schema.TypeString,
 		Optional:         true,
 		ValidateDiagFunc: validators.ValidateEnumValue(datadogV1.NewSyntheticsTestOptionsHTTPVersionFromValue),
@@ -3345,6 +3346,12 @@ func updateSyntheticsAPITestLocalState(d *schema.ResourceData, syntheticsTest *d
 			localRequest := buildLocalRequest(stepRequest)
 			localRequest["allow_insecure"] = stepRequest.GetAllowInsecure()
 			localRequest["follow_redirects"] = stepRequest.GetFollowRedirects()
+			if step.GetSubtype() == "grpc" {
+				// the schema defines a default value of `http_version` for any kind of step,
+				// but it's not supported for `grpc` - so we save `any` in the local state to avoid diffs
+				localRequest["http_version"] = datadogV1.SYNTHETICSTESTOPTIONSHTTPVERSION_ANY
+			}
+
 			localStep["request_definition"] = []map[string]interface{}{localRequest}
 			localStep["request_headers"] = stepRequest.GetHeaders()
 			localStep["request_query"] = stepRequest.GetQuery()