How solve Acces has been blocked by CORS policy?-CodePudding

hello I have this common error, and I don't understand how to remove it, useful in front of Angular14 and I try to call an https URL which works if I enter it in the navigation bar.

i try to use anuglar proxy but not working

I know that I can use a browser plugin to disable it, I would like none of the users to install it.

And I would like to know if it is possible and how to simulate another orgins because I work in localhost for the front and my back and on a server.

Access to XMLHttpRequest at '<my https url back' from origin 'localhost' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

proxy-prod.conf.json/proxy-dev.conf.json

    "/api": {
      "target": ["http://localhost:8080","https://myurl.com",...],
      "secure": false
    }

angular.json

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

CodePudding user response：

Is server side err, they need to accept your host url in the cors polocy.

CodePudding user response：

The CORS mechanism is implemented by the browser. It means that if you bypass the browser (with a proxy server, for instance) you will be able to bypass this validation.

In angular application you can use the proxy on development server.

Create a file name proxy.conf.json with following content:

{
    "/": {
      "target": "http://localhost:5000",
      "secure": false
    }
}

Note: replace for your hostname

Then, run the angular application with following command:

ng serve --proxy-config=proxy.conf.json

See this for reference