Access-Control-Allow-Origin added to firebase.json but not in the response header of the file

Question

Below is my simple firebase.json. If I read the documents correctly, it should mark all the files with "Access-Control-Allow-Origin". Unfortunately, none of the files are marked, which leads to an error:

An imported resource from the source ' https://gaspush.firebaseapp.com ' has been blocked from downloading by the Cross-Origin resource sharing policy: No The header of the Access-Control-Allow-Origin header is present in the requested resource.

Can someone take a look and let me know how to properly resolve all files for all endpoints?

{
  "firebase": "gaspush",
  "headers": [ {
    "source" : "**",
    "headers" : [ {
      "key" : "Access-Control-Allow-Origin",
      "value" : "*"
    } ]
  } ],
  "public": ".",
  "ignore": [
    "firebase.json",
    "**/.*",
    "**/node_modules/**"
  ]
}

Answer 1

, , Firebase. "headers" "hosting". .

{ "hosting": { "public": ".", "headers": [ { "source" : "**", "headers" : [ { "key" : "Access-Control-Allow-Origin", "value" : "*" } ] } ] } }