earlier replies
Replying to @kylewmahan
@kylewmahan yes! Just make sure you urlencode each of them and use comas as "glue" :)
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@superfeedr @kylewmahan Why not use array syntax like `hub.url[]=x&hub.url[]=y`?
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@aaronpk @kylewmahan I guess we could! Feel free to add a suggestion in github issues (on mobile now!)
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Replying to @superfeedr
@superfeedr @kylewmahan cool! Also do you know the reason `hub.url` was chosen for publish rather than `hub.topic`?

Apr 26, 2015 · 5:50 PM UTC

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Replying to @aaronpk
@aaronpk @kylewmahan Not 100% sure but I think there's not a strict overlap between things one can ping and things one can subscribe to.
Replying to @aaronpk
@aaronpk @kylewmahan for example, firehoses could be subscribed to, but not "pinged"… etc.