![]() This config indicates if the server should respond to preflight requests.īelow you can find the common patterns to use the plugin. If this header is not present in the response headers, it means that CORS has not been set up on the server. The value of this header consists of origins that are allowed to access the resources. Response with OPTIONS request with 3 HTTP request headers: The Access-Control-Allow-Origin response header is perhaps the most important HTTP header set by the CORS mechanism. The preflight request is a request sent to check if the CORS protocol is understood and if a server is aware of using specific methods and headers. Indicates how long the results of a preflight request (that is the information contained in the Access-Control-Allow-Methods and Access-Control-Allow-Headers headers) can be cached. ![]() When a request's credentials mode Request.credentials is include, browsers will only expose the response to the frontend JavaScript code if the Access-Control-Allow-Credentials value is true.Ĭredentials are cookies, authorization headers, or TLS client certificates.Īssign Access-Control-Allow-Credentials header. The Access-Control-Allow-Credentials response header tells browsers whether to expose the response to the frontend JavaScript code when the request's credentials mode Request.credentials is include. string - Expects either a single header or a comma-delimited string.string - Allow multiple HTTP headers.Īssign Access-Control-Expose-Headers header.string - Allow multiple HTTP methods.Īssign Access-Control-Allow-Headers header.string - Expects either a single method or a comma-delimited string.undefined | null | '' - Ignore all methods.The target must be the url of the real api server, for example. You defined a proxy on in the Vite server, but I think you made a mistake there. You can only set CORS on the server side, in your case this is the Vite server. Array - iterate through all cases above in order, allowed if any of the values are true.Īllowed methods for cross-origin requests.Īssign Access-Control-Allow-Methods header. First, you do not need the Access-Control.Typescript cors (context: Context) => boolean | void cors (context: Context) => boolean | void What you saw in Firefox was not the actual request note that the HTTP method is OPTIONS, not POST.
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