Unable to make async rest request from a before business rule?

[dachtman]

I have a business rule that runs on insert and update on a app scoped table.The business rule calls a restful webservice and based on the response the operation should either be aborted or continue.

When I run this as a before rule I get an error stating Use an async business rule to perform outbound HTTP requests. I have tried switching the webservice to use executeasync and that has caused more errors with truncation of the endpoint. I have also tried switching the business rule to async but that doesn't allow for me to stop the current operation.

[Pradeep Sharma]

Hi Darrin,

Please refer section 3.1 for more info on BR.

Business Rules - ServiceNow Wiki

[dachtman]

All the scripts and tables are in the same scope. So according to section 3.1 I should be able to abort the action using a before business rule.

[aklimenko]

I had the same problem but it was resolved by executeAsync and later waiting for it. Something like this:

var response = (new MyRestUtil()).execute(serviceNowEndPoint, typeMethod, parameters, domain);

response.waitForResponse(60);

MyRestUtil has something like:

var restCall = new sn_ws.RESTMessageV2(serviceNowEndPoint, typeMethod);

return restCall.executeAsync();

Hope this helps

[xMTinkerer]

Ok, so I'm having trouble with this. When using the "executeAsync" with "waitForResponse" the UI freezes until the request finishes. But if I use just execute, it completes and comes back quickly.

Take this business rule (I've put all the code here, but it shouldn't matter if it was in a script include or not):

Name: REST Call Testing

Table: Incident

Active: checked

Advanced: checked

When: before

Script:

function onBefore(current, previous) {

     //This function will be automatically called when this rule is processed.



var doAsync = false;

var bin = 'http://requestb.in/1jgih3k1'



try{

       var restMessage = new sn_ws.RESTMessageV2();

       restMessage.setBasicAuth("admin", "admin" );

       restMessage.setHttpMethod( "post" );

       restMessage.setEndpoint( bin );

       restMessage.setRequestBody("{\"short_description\" : \"Test incident\"}");



       if( !doAsync )

           var response = restMessage.execute();

       else {

           response = restMessage.executeAsync(); //Might throw exception if http connection timed out or some issue with sending request itself because of encryption/decryption of password.

           response.waitForResponse(60);// In seconds. Wait at most 60 seconds to get response from ECC Queue/Mid Server //Might throw exception timing out waiting for response in ECC queue.

       }



   responseBody = response.haveError() ? response.getErrorMessage() : response.getBody();

   status = response.getStatusCode();

} catch(ex) {

   responseBody = '' + ex; //ex.getMessage();

   status = '500';

} finally {

   requestBody = restMessage? restMessage.getRequestBody():null;

}

gs.info("Request Body: " + requestBody);

gs.info("Response: " + responseBody);

gs.info("HTTP Status: " + status);



   gs.addInfoMessage( 'Finished' );

}

If I have "doSync=true", then I get the big nasty message posted above: Illegal access to outbound HTTP in Testing6. Use an async business rule to perform outbound HTTP requests. But the request completes anyway!

However, if I have doSync=false, then the UI freezes until the request completes.

Did either of you experience this, or am I doing something wrong?