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JS can't receive JSON data from orion-ld broker, a CORS related issue occurred

I use orion-ld context broker

{
"orionld version": "post-v1.0.0",
"orion version": "1.15.0-next",
"uptime": "0 d, 0 h, 25 m, 17 s",
"git_hash": "nogitversion",
"compile_time": "Wed Jan 26 15:58:47 UTC 2022",
"compiled_by": "root",
"compiled_in": "",
"release_date": "Wed Jan 26 15:58:47 UTC 2022",
"doc": "https://fiware-orion.readthedocs.org/en/master/"
}

If I try to request JSON data in an HTML file via JS like

var myRequest = new XMLHttpRequest();
myRequest.open("GET", "http://192.168.0.18:1028/ngsi-ld/v1/entities/urn:ngsi-ld:OffStreetParking:XXX_102700") ;
myRequest.setRequestHeader("Accept", "application/ld+json")       
myRequest.onload = function () {
    console.log(myRequest.responseText);
};
myRequest.send();

I got a error: "Access to XMLHttpRequest at 'http://192.168.0.18:1028/ngsi-ld/v1/entities/urn:ngsi-ld:OffStreetParking:XXX_102700' from origin 'http://192.168.0.18' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource."

If I login to the docker container console and check the variable ORIONLD_CORS_ALLOWED_ORIGIN, it contains the necessary value "__ALL".

What could be wrong here?

Update at 03/01/2022: Now I create a simple webpage based on JS functions from NGSI.js, as Jason Fox yesterday suggested. There you are able to test the "v2" related calls to the orion-ld and the "ld" related calls. In the browser console, you can see the logged results. You can also change the orion-ld URL on the website so that you can test your environment. Nevertheless, the CORS settings for orion-ld server did not work as expected. 'v2' calls work well, 'ld' calls failed. I create my orion-ld test environment with the following docker-compose.yml:

version: "3.5"
services:
  orion-ld:
    image: fiware/orion-ld
    hostname: orion-ld
    ports:
      - "1029:1026"
    depends_on:
      - mongo-db  
    environment:
      ORIONLD_CORS_ALLOWED_ORIGIN: __ALL
      corsOrigin: __ALL
      ORIONLD_CORS_MAX_AGE: 86400
    command: -dbhost mongo-db-vm -logLevel DEBUG

  mongo-db:
    image: mongo:3.6 
    hostname: mongo-db-vm
    volumes:
      - /SOMEWHERE/data:/data

Please test my and your environment on simple webpage and give feedback.

about 4 years ago · Juan Pablo Isaza

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Answer 1 · 2022-07-03T20:22:08.132Z

Orion-LD architect and developer here. All Orion-LD has about CORS is what was inherited from Orion. This is the first time anybody asks for CORS for Orion-LD, so, I'll try to fix it asap.

Answer 2 · 2022-07-03T20:22:08.237Z

I guess this is all about a local development setup. Thus you probably call your frontend at "localhost" or "127.0.0.1", leading to the CORS-issue when it calls orion at "192.168.0.18". You basically have 2 options to still make it work:

disable CORS in your browser when developing. Concrete solution depends on your browser.
Put Orion-LD on localhost, thus calling it with the same origin as your frontend. The docker-compose snippet that you posted already puts orion on "localhost:1029"/"127.0.0.1:1029"(see ports-section). Thus, you should configure the orion endpoint in your frontend to "localhost:1029"/"127.0.0.1:1029"(depending on the address you use when calling orion) instead of the current container-ip(e.g. "192.168.0.18:1028")

I do not think it worth implementing the CORS-support directly in Orion-LD, since this is not a real deployment scenario. In real-world scenarios, you would have one of the following:

A very small scenario, that does not even use any kind of security framework and only one broker instance. In such environments, its very unusual to have the frontend running on a different origin.
A security framework between orion and the frontend. In this case, the requests from the frontend will never directly reach the broker, but the security-layer instead. Thus, the security component has to provide the CORS-header.
A scenario with any kind of additional infrastructure(most probably a load-balancer or f.e. an lb+an ingress controller in k8s-environemnts). Similar to scenario 2, this would lead to no request directly reaching the broker and the component between frontend and broker needs to handle CORS.

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JS can't receive JSON data from orion-ld broker, a CORS related issue occurred

What could be wrong here?

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Andres GPT