Here's my code: there is something you should do on your server config you should enable CORS is sulfur transparent translucent or opaque; 5 letter word with tact For example, if you are trying to fetch some data from your website ( my-website.com) to ( another-website.com) and you make a POST request, you can have cors issues, but if you fetch the data from your own domain you will be good. How to parse a JSON file without web request or web server? This will be in the form of additional headers like Access-Control-Allow-Methods and Access-Control-Allow-Headers. For example, if an extension contains a JSON configuration file called config.json, in a config_resources folder, the extension can retrieve the file's contents like this: var xhr = new XMLHttpRequest(); I tried to send Please be sure to answer the question.Provide details and share your research! apache MDN states that simple requests will be send if the Content-Type is one of the following: However, Content-Type: application/json is not allowed for simple requests. Sending an HTTP GET request to this URL returns the following data. It is now read-only. it hits the API and sends a response from API but not received as a response in Flutter Web. In this HTML code, we have a myFunc defined in the