android - Designing REST API for duplicate calls -

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when designing rest-ful api, need handle client connectivity status?

for example: in android, user wants send billing details email. clicks "send" button, app goes call api endpoint. @ point before api returns response, app loses network connectivity. meanwhile, transaction on server-side (sending bill details user's email) done. user doesn't know , clicks "send" button again. later when checks email, there 2 emails billing details.

now understand transactions such shopping basket, client needs include transaction id in request body make idempotent. but, need use method other api calls?


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