has custom headers or a Content-Type that you couldnt use in a forms, exist on the same origin as the HTML document. mongodb 124 Questions I don't know the solution for php code, but I use the following code . html 1917 Questions Dont know what your computers name is? Hi there, I am currently facing an issue in the js console of my woocommerce page when GTranslate-Plugin is activated . If you used fetch and set no-cors mode then the instruction to set the Content-Type would be ignored. However, you are trying set a Content-Type of application/json which requires permission from CORS, so you can't use no-cors mode anyway. They arent passing data from one website to the JavaScript belonging to a different website just because you visited that different website. The reason why your example works when using fetch is because those options are part of the Request API (docs for mode are here ). (Note that you can, for example, display an image using an element across origins because the content of the image is not exposed to JavaScript (or Mallory) unless you throw canvas into the mix in which case you will generate a same-origin violation error). Implementations of CORS that only add Access-Control-Allow-Origin to specific URLs often get tripped up by this. 3. test if the HTML worked. The Sec-Fetch-Mode fetch metadata request header indicates the mode of the request. Obviously granting permission via CORS is something Bob would only do only if either: It depends on your server-side environment. arrays 712 Questions That doesnt mean you cant continue to use JavaScript and HTML, but you could distribute it using some other mechanism, such as Node-WebKit or PhoneGap. const allowedOrigins= [http://localhost:3000', http://(your computers name):3000]; var corsOptionsDelegate = (req, callback) => {. Hi, I have a Web app which I want to test from a Web server running using "0.0.0.0" so it's accessible from localhost and intranet hostname. Since JSONP works by appending a