Transaction-Id support by resource

[zhenwan]

Some SDKs permit users to enter a custom header Transaction-Id for debugging purpose, for example IAM Policy Management:
https://test.cloud.ibm.com/apidocs/iam-policy-management#additional-headers

but this service's Terraform Provider's resource creation does not support header Transaction-Id
https://github.com/IBM-Cloud/terraform-provider-ibm/blob/master/ibm/resource_ibm_iam_user_policy.go

Question: Does IBM Terraform Provider support custom header, i.e. Transaction-Id?

It seems Google's Terraform Provider support custom header:
hashicorp/terraform-provider-google#7299

[zhenwan]

To support Transaction-Id in our service Terraform Provider, I need to do following steps:

• Get transaction-id in xxxCreate method:

	if _, ok := d.GetOk("transaction_id"); ok {
		createRuleOptions.SetTransactionID(d.Get("transaction_id").(string))
	}

• In xxxRead method. I retrieve transaction-id passed in from xxxCreate, and set getxxxOptions object which is used to read the resource back:

	if _, ok := d.GetOk("transaction_id"); ok {
		transactionIDFromInput = d.Get("transaction_id").(string)
		getRuleOptions.SetTransactionID(transactionIDFromInput)
	}

• In xxxRead method read the transaction-id from response, and set call d.Set

	transactionIDFromResponse := response.GetHeaders()["Transaction-Id"][0]
	if transactionIDFromInput != "" {
		if err = d.Set("transaction_id", transactionIDFromResponse); err != nil {
			return diag.FromErr(fmt.Errorf("Error setting transaction_id: %s", err))
		}
	}

Please let me know if this is the right way to support transaction-id in header