Extension API with Authorization fails: SELF_SIGNED_CERT_IN_CHAIN

[geertclaes-rwe]

We are getting the following error when trying to call an API in one of our extensions (we are behind a zscaler proxy). The API call works fine in postman and our test python code.

TypeError: fetch failed
    at node:internal/deps/undici/undici:13178:13
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  [cause]: Error: self-signed certificate in certificate chain
      at TLSSocket.onConnectSecure (node:_tls_wrap:1674:34)
      at TLSSocket.emit (node:events:519:28)
      at TLSSocket._finishInit (node:_tls_wrap:1085:8)
      at ssl.onhandshakedone (node:_tls_wrap:871:12)
      at TLSWrap.callbackTrampoline (node:internal/async_hooks:130:17) {
    code: 'SELF_SIGNED_CERT_IN_CHAIN'