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rpc: add method to test for subscription support (ethereum#25942)
This adds two ways to check for subscription support. First, one can now check whether the transport method (HTTP/WS/etc.) is capable of subscriptions using the new Client.SupportsSubscriptions method. Second, the error returned by Subscribe can now reliably be tested using this pattern: sub, err := client.Subscribe(...) if errors.Is(err, rpc.ErrNotificationsUnsupported) { // no subscription support } --------- Co-authored-by: Felix Lange <fjl@twurst.com>
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