![]() You can use ajax function to make the request to another domain (which will have the appropiate headers). ![]() Xhr.setRequestHeader('Content-Type', 'application/json') We will cover some examples with different libraries Vanilla javascript var xhr = new XMLHttpRequest() In the past doing a CORS request with javascript was tricky, today you can use axios or the mozilla Fetch API. Usually frameworks like Django or Flask supports CORS or is pretty easy to add those headers. You will need to make changes on the other server to add those response headers. The key point is that the other domain will add headers to the response and this will allow the browser to execute the XMLHttpRequest. Using CORSįirst you need to understand CORS. We are not going to cover using JSONP or build a custom proxy, but those two are possible solutions. We are going to see in this tutorial how to fix the error "'Access-Control-Allow-Origin' header is present on the requested resource". The proper way to solve this issue is using Cross-Origin Resource Sharing (CORS). Using JSONP as the response format n process using a callback. Well, i use thunder client to check if my endpoint works well, and it is correct. If you own the requested server you can add Access-Control-Allow-Origin as your application domain. Same origin policy means that request can only be made to the same domain an not another one. Hello Guys I hope you’re well, First of all sorry for my bad english, i try to make a good explanation, I have a proyect, in this i use axios to make a POST peticion, to make this peticion i use netlify serverless functions to use the entry endpoint, this endpoint point to supabase. You can use XMLHttpRequest to receive and send data to remove server, but it's limited by the same origin policy. This is a security protection on the browsers and it's an expected error. Origin 'null' is therefore not allowed access. use instead cors npm package and then get advantages of app.use(cors()), this will allow all origins to access your content. No 'Access-Control-Allow-Origin' header is present on the requested resource. ![]() When you are developing a web application that tries to access another domain using javascript for querying an API RestFUL, it common to get the following error: XMLHttpRequest cannot load.
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