Processing the OPTIONS preflight request never actually executes GraphQL operations. That is, the endpoint does not return Access-Control-Allow-Headers in the response. Since OPTIONS is a standard method that browsers. This program and the accompanying materials 5 * are made available under the terms of the Eclipse Public License v1.0 6 * which accompanies this distribution, and is available at 7 * 8 * 9 * Contributors: 10 * IBM Corporation - Initial implementation 11 *******************************************************************************/ 12 // end::copyright 13 package it.io. ġ4 15 import static .Assertions.assertEquals Ģ1 22 import .BeforeEach Ģ6 27 String port = System.getProperty( " ") Ģ8 String pathToHost = " " + port + " / " ģ2 // JVM does not allow restricted headers by default 33 // Set to true for CORS testing 34 tProperty( " . CORS uses specific HTTP response headers as part of its protocol. The root cause of this issue is that our API does not allow cross-origin requests. When you see this error, it means your code is triggering your browser to send a CORS preflight OPTIONS request, and the servers responding with a 3xx. The value is returned in the Access-Control-Allow-Methods header in response to successful pre-flight requests. ![]() This header is required if the request has an Access-Control-Request-Headers header.
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