Created question in FIWARE Q/A platform on 27-02-2022 at 08:02
Please, ANSWER this question AT https://stackoverflow.com/questions/71283416/js-cant-receive-json-data-from-orion-ld-broker-a-cors-related-issue-occurred

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

Description:
I use orion-ld context brocker
{
"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&quot ;
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?