Missing User-Agent header in Post request to cognito

[abcJo]

When using a Congito User Pool with a WAF attached the following scenario occurs:
The post request to exchange the authorization token to Cognito /oauth/token endpoint is blocked by a WAF that contains the AWS managed rule AWSManagedRulesCommonRuleSet.
Specifically, the NoUserAgent_HEADER rule blocks the request.

Is it possible to update the request configurations, so that the User-Agent header is set?

[ottokruse]

Sure thing, wanna send a PR?

Just inject a default user agent header option here:

cloudfront-authorization-at-edge/src/lambda-edge/shared/shared.ts

Lines 498 to 502 in 612fddc

	return await fetch(url, data, {
	agent: AGENT,
	...options,
	method: "POST",
	}).then((res) => {

[abcJo]

Great.
I'd love to, however, I'm not at all familiar with typescript.
It's probably much faster if you could do it :)
Thanks!

[ottokruse]

No worries, but I don't know when I'll have bandwidth for it.