SendEachAsync sends one HTTP request to V1 Send endpoint for each message in the list. SendAllAsync sends only one HTTP request to V1 Batch Send endpoint to send all messages in the list.
SendEachAsync calls Task.WhenAll to wait for all httpClient.SendAndDeserializeAsync calls to complete and construct a BatchResponse with all SendResponses. An httpClient.SendAndDeserializeAsync call to V1 Send endpoint either completes with a success or throws an exception. So if an exception is thrown out, the exception will be caught in SendEachAsync and turned into a SendResponse with an exception. Therefore, unlike SendAllAsync, SendEachAsync does not always throw an exception for a total failure. It can also return a BatchResponse with only exceptions in it.
SendEachForMulticastAsync calls SendEachAsync under the hood.
SendEachAsyncvsSendAllAsyncSendEachAsyncsends one HTTP request to V1 Send endpoint for each message in the list.SendAllAsyncsends only one HTTP request to V1 Batch Send endpoint to send all messages in the list.SendEachAsynccallsTask.WhenAllto wait for allhttpClient.SendAndDeserializeAsynccalls to complete and construct aBatchResponsewith allSendResponses. AnhttpClient.SendAndDeserializeAsynccall to V1 Send endpoint either completes with a success or throws an exception. So if an exception is thrown out, the exception will be caught inSendEachAsyncand turned into aSendResponsewith an exception. Therefore, unlikeSendAllAsync,SendEachAsyncdoes not always throw an exception for a total failure. It can also return aBatchResponsewith only exceptions in it.SendEachForMulticastAsynccallsSendEachAsyncunder the hood.