services/horizon/txsub: submitting transaction with future sequence may result in 60s timeout

[sreuland]

What version are you using?

2.28.0

What did you do?

submit a tx with a sequence number that is gapped farther out than current source account seq+1.

curl --location 'https://<horizon_2.28.0_on_testnet>/transactions' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data-urlencode 'tx=AAAAAgAAAACI3DQX1QWOxLRQPgwS6hoKib4gD+mJIkI9QzQBT6aw7gAAJxAAAYJ5AAABZAAAAAAAAAABAAAAHEJXUnhramQ5V3VkdXVrZXdrakN1dVVjQlk0YWgAAAABAAAAAQAAAACI3DQX1QWOxLRQPgwS6hoKib4gD+mJIkI9QzQBT6aw7gAAAAEAAAAAO5kROA7+mIugqJAOsc/kTzZvfb6Ua+0HckD39iTfFcUAAAAAAAAAAAAAA/IAAAAAAAAAAU+msO4AAABANwm//iyoc4FjpAp4awoQLQmakCKF4HNiNZp02fm+cHZtJ1QOKR6ZjZGPUipUj/AkyhYDtqOBMNfXvR49YExTCg=='

What did you expect to see?

tx_bad_seq error returned

What did you see instead?

60 second timeout from server

[sreuland]

closing, the fix was in #5191 and merged, released on 2.28.1