danielcweeks commented on code in PR #18080:
URL: https://github.com/apache/iceberg/pull/18080#discussion_r4023245265


##########
open-api/rest-catalog-open-api.yaml:
##########
@@ -1410,12 +1400,35 @@ paths:
       - $ref: '#/components/parameters/prefix'
       - $ref: '#/components/parameters/namespace'
       - $ref: '#/components/parameters/table'
+      - $ref: '#/components/parameters/data-access'
 
     post:
       tags:
         - Catalog API
       summary: Remotely signs requests to object storage
       operationId: signRequest
+      description: >
+        Signs one request to object storage on the client's behalf.
+
+
+        `RemoteSignResult` takes one of two forms. With `remote-signing`, 
`uri` is the
+        requested URI and `headers` carries the signature. With 
`presigned-urls`, `uri`
+        carries the signature and `headers` is empty.
+
+
+        `X-Iceberg-Access-Delegation` on this operation is not a capability 
negotiation.
+        When used, the client selects the form of the result for this request, 
and the
+        server SHOULD answer in that form. A server that does not implement 
the requested
+        mode SHOULD respond with 406 rather than answer in another form.
+
+
+        Only `remote-signing` and `presigned-urls` are evaluated on this 
operation. A request
+        that selects both modes is malformed, 400. When no mode is present the 
request is
+        treated as `remote-signing`.

Review Comment:
   I don't agree with this.  If both modes are provided, it means that the 
client will support and use either one. The header was intended to allow for 
multiple modes, so that should be supported.



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