Angular proxy config not having any effect

I have a REST API backend running at http://localhost:8000/api, my Angular 13 app runs at http://localhost:4200. Naturally, I receive a CORS error when trying to query any endpoint of that backend.

So I tried to set up the Angular proxy. I added the file src/proxy.conf.json with the following content:

{
"/api": {
"target": "http://localhost:8000",
"secure": false,
"logLevel": "debug"
}
}


After that, I added the following to angular.json:

"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"options": {
"proxyConfig": "./src/proxy.conf.json"
},
"configurations": {
"production": {
"browserTarget": "photon:buildroduction"
},
"development": {
"browserTarget": "photon:build:development"
}
},
"defaultConfiguration": "development"
},


(I also added the proxyConfig node under "development" configuration, but no change.)

Now, when I run npm start, which triggers ng serve, I do not see that the proxy is set up at all in the console output - and the API request still receives a CORS error. I believe there should be some console output that shows that the proxy was set up, like so:

Proxy created: /api -> http://localhost:8080 (I saw this here.)

I have no idea why this is not working, this should be simple.

Edit: Here is the request function itself.

get(url: string) {
return fetch(this.apiUrl + url, {
method: 'GET',
headers: {
'Content-Type': 'application/json'
}
})
.then(response => {
console.log(response);
return response.json();
});
}


The URL that this function receives is correct, I can see that in the debugger.

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