Submitting a transaction from a query method

From within a “query” method is it possible to invoke a “mutate” method on the same canister or on another canister within the same subnet? If so, how is the transaction signed? Thanks in advance.

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No, it is not possible. The one ‘exception’ being the upgrade from http_request to http_request_update, but in that case it’s the boundary node that does the conversion

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