How to chain requests one after another using Promises -


i have create code login request consists of 4 steps:

  • send username , password values url (http post) => response#1
  • extract header info response#1 , send url (http get) => response#2
  • extract , modify header info response#2 , send 3rd url (http get) => response#3
  • if response#3 ok user data based on response#2 4th url => response#4

each of these steps can either fail or succeed.
steps can fail multiple ways (wrong status code, wrong response etc.)

what need way create function returns promise being resolved response#4 or rejected reason comes previous requests.

i writing in swift solution (language) accepted, i'll make fit swift
:)

here imagine great think it's not possible:

promise() { resolve, reject in     //resolve(response#1)     //reject(some reason) }.then(sendsecond) // can use response#1 .then(sendthird) // cannot use response#2 since isn't syncronous .then(sendfourth) // same sendthird


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