Another method type (such as GET, PUT, or POST) isn't configured to return the required CORS headers.The API isn't configured with an OPTIONS method that returns the required CORS headers.Note: The No 'Access-Control-Allow-Origin' header present error can occur for any of the following reasons: For example: Method not supported under Access-Control-Allow-Methods header errors and No ‘Access-Control-Allow-Headers’ headers present errors. However, you can use a similar procedure to troubleshoot all CORS errors. ![]() The following example procedure shows how to troubleshoot the No ‘Access-Control-Allow-Origin’ header present CORS error. Note: CORS must be configured at the resource level and can be handled using API Gateway configurations or backend integrations, such as AWS Lambda. For HTTP APIs, see Configuring CORS for an HTTP API. To resolve a CORS error from an API Gateway REST API or HTTP API, you must reconfigure the API to meet the CORS standard.įor more information on configuring CORS for REST APIs, see Turning on CORS for a REST API resource. If so, this is still an issue that needs to be solved on the backend by configuring your server to reply with the proper headers.Cross-Origin Resource Sharing (CORS) errors occur when a server doesn’t return the HTTP headers required by the CORS standard. Manually inspect the failing request and see if the response is missing the header. The easiest way to check is to look at the browser's dev tools and open the network tab. So my feeling is that you did the right thing by configuring your server to append the missing header, but it's possible that something went wrong with this process. The question is whether the server is responding with the correct headers. ![]() In terms of the header, setting it in the browser shouldn't make a difference. edit - disregard this, looks like the third argument specifies whether the request should be async or not. In the sample you posted, the status will never be 200. It's been a while since I've manually sent an XMLHttpRequest but I think you need to set the onload property to a function that will be called when the response is received. I would recommend using esri/request for HTTP requests if that's possible. send ( ) //console.log(http.status) if (http. open ( 'HEAD', reportPath, false ) //tRequestHeader('Access-Control-Allow-Headers', '*') Var http = new XMLHttpRequest ( ) var contentResult = "" This checks to see if the report has already been generated, and if so, returns it to the popup. I think the section that's causing all the errors is below. I wrote everything in ArcGIS-JS-API, yes. I tried adding the URL of our webserver and it didn't help.ģ. Yes, they are on the same Windows Server 2012 machine.Ģ. I'm pulling my hair out trying figure this out.ġ. Origin 'null' is therefore not allowed access." ![]() I've also tried removing these lines from the webconfig and adding " Access-Control-Allow-Origin, * " under HTTP response headers in our IIS web server manager and I get this error "The 'Access-Control-Allow-Origin' header contains multiple values 'null, *', but only one is allowed. I tried adding this to my JavaScript code and it worked in once instance, but not another.Į.corsEnabledServers.push("") I've tried adding this to our webconfig file, and it doesn't help. I get the CORS error when the server tries to return the report PDF to the popup in the map window. ![]() I have a geoprocessing tool on the ArcGIS server that generates a report from a map click. I've been dealing with this issue for a while.
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