adutra commented on code in PR #10314:
URL: https://github.com/apache/iceberg/pull/10314#discussion_r1601396353


##########
core/src/main/java/org/apache/iceberg/rest/auth/OAuth2Util.java:
##########
@@ -763,11 +763,19 @@ private static AuthSession fromTokenResponse(
         long startTimeMillis,
         AuthSession parent,
         String credential) {
+      // issued token type is not present in every OAuth2 response:
+      // assume type is access token if none provided.
+      // See https://datatracker.ietf.org/doc/html/rfc6749#section-4.4.3

Review Comment:
   Indeed, Keycloak does not fully implement it. Quoting from their [Securing 
Applications and Services 
Guide](https://www.keycloak.org/docs/latest/securing_apps/index.html#how-token-exchange-works):
 
   
   > Token exchange in Keycloak is a very loose implementation of the OAuth 
Token Exchange specification at the IETF. We have extended it a little, ignored 
some of it, and loosely interpreted other parts of the specification. It is a 
simple grant type invocation on a realm’s OpenID Connect token endpoint.



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