topic Cross-Origin problem with NPrinting API in Qlik NPrinting

Cross-Origin problem with NPrinting API

master_t — Wed, 25 Sep 2019 18:40:54 GMT

Hello everyone

I'm trying to invoke the NPrinting API from a mashup website, which is located on a different domain.

However, when I try to invoke the API, like this:

let requestBody = {
  type: "Report",
  config: {
    reportId: reportUid,
    outputFormat: outFormat
  }
};
$.ajax({
  method: "POST",
  url: npEndpoint + '/ondemand/requests',
  data: requestBody,
  xhrFields: {
    withCredentials: true
  }
});

The browser gives the following error:

Failed to load https://alt157vir:4993/api/v1/ondemand/requests: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:61817' is therefore not allowed access. The response had HTTP status code 502.

The thing is, the NPrinting documentation states that:

All endpoints also support the HTTP OPTIONS verb, and will respond with the correct CORS headers (cross-origin resource sharing) based on the Qlik NPrinting Server settings.

(from here: https://help.qlik.com/en-US/nprinting/September2017/Content/Extending/Intro-Extending.htm)

but I cannot find those settings! Where can I configure this?

Re: Cross-Origin problem with NPrinting API

Ruggero_Piccoli — Wed, 14 Mar 2018 14:53:36 GMT

Hi,

I'm not a developer so I asked the help of a colleague. If seems an authentication issue, so you should check the code

return $.ajax( {

method: 'POST',

url: url,

xhrFields: {

withCredentials: true

headers: headers,

dataType: 'json',

contentType: 'application/json; charset=utf-8',

data: objData

} );

Here there is an example in Python NPrinting API script Example - Python different language but you can see how to connect.

Best Regards,

Ruggero

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Re: Cross-Origin problem with NPrinting API

master_t — Wed, 14 Mar 2018 15:01:23 GMT

Well, I found out the problem.

You have to add the origin domain to the "trusted QlikView server" in NPrinting web console -> admin -> settings -> on-demand settings.

I didn't try that at first because I thought it was a specific setting for QlikView (as the name implies), when in reality it lets you add trusted origins of any kind. They should really change the name of that setting, it's confusing imho.

Re: Cross-Origin problem with NPrinting API

master_t — Wed, 14 Mar 2018 15:02:07 GMT

Thanks for your reply, but I found out the problem, and it wasn't an authentication issue. Check my answer for details. THanks again for your time.

Re: Cross-Origin problem with NPrinting API

Marc — Sun, 06 May 2018 06:22:02 GMT

After Authentication, you will receive a Cookie. you need to add the Cookie Token to the Header X-XSRF-TOKEN

Not very obvious, but found it while debugging the same issue.

Re: Cross-Origin problem with NPrinting API

Anonymous — Thu, 17 May 2018 03:21:36 GMT

Hi, Marc. Thank you for this information.

> you need to add the Cookie Token to the Header X-XSRF-TOKEN

How is this done on the client? I thought cross-site cookies were inaccessible to script code?

Re: Cross-Origin problem with NPrinting API

Lech_Miszkiewicz — Thu, 17 May 2018 03:36:01 GMT

Hi Andrew,

since i am not a dev my knowledge limits to what i understand. Have a look at PDF from the link below; pages 9-11 describe where you get a cookie from.

How to use Qlik NPrinting APIs inside a Qlik Sense load script

that should help you.

cheers

Lech

Re: Cross-Origin problem with NPrinting API

andrewferguson — Thu, 24 May 2018 03:27:32 GMT

Very helpful link. Thank you!