Sending XML to a third party server.

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Using the Site Events Viewer and the Trigger Backend functions I have created a FETCH POST request to send some XML to a third party server. The third party server is a test platform called webhook.site.

When I run the FETCH code in the front-end it reaches my webhook.site; it does not, however, arrive at the webhook.site when running in the back-end?

I have stripped the code right back to the basics - webhook is fully ‘open’, no authentication or whatever needed…


export async function getTPCatalogue(xml_parm) {

 const url = 'https://webhook.site/545f7ea6-c1fa-4b9b-XXXXXXXXXXXXXXXXXX';
 
 return fetch (url,
    {
       "method": "post",
       "mode": "no-cors",  
       "headers": 
        {
          "Content-Type": "text/xml",
          "Content-Length": "2023",
          "Host": "webhook.site"
        },
 
       "body": "TEST ABC"
    })
 
 .then( (httpResponse) => {
       if (httpResponse.ok) {
          console.log("RESPONSE OK");
          return httpResponse.json();
        } else {
          console.log("RESPONSE NOT OK");
          return Promise.reject("Fetch did not succeed");
        }
    })
 
    .then( (json) => console.log(json) )
 
    .catch(err => console.log(err));
}

Note: I’ve obscured the webhook URL

Any ideas how to progress this please?