@startuml
skinparam dpi 300
skinparam classFontSize 8
skinparam classFontName Helvetica
autonumber

box "Application" #LightGreen
    participant "Main Thread" as application
    participant "HTTP Thread" as httpthread
end box

box "Queues" #Orange
    participant "Request queue" as requestqueue
    participant "Response queue" as responsequeue
end box

box "HTTP Server" #Yellow
    participant "S3" as server
end box

activate application
loop until session established or all attempts exhausted
application -> server: Establish TLS session (client verifies server's certificate)
server -> application: Session established (no client authentication)
end

application -> httpthread: Start HTTP thread
activate httpthread

application -> application: Set request info parameters

application -> application: Initialize request headers (HTTPClient_InitializeRequestHeaders)
application -> application: Add range header (HTTPClient_AddRangeHeader)
application -> requestqueue: Enqueue request

requestqueue -> httpthread: Dequeue request
httpthread -> server: Send HTTP GET request (HTTPClient_Send)
activate server

application -> application: Initialize request headers (HTTPClient_InitializeRequestHeaders)
application -> application: Add range header (HTTPClient_AddRangeHeader)
application -> requestqueue: Enqueue request

server -> httpthread: Recieve HTTP response
deactivate server
httpthread -> responsequeue: Enqueue response
requestqueue -> httpthread: Dequeue request
httpthread -> server: Send HTTP GET request (HTTPClient_Send)
activate server

responsequeue -> application: Dequeue response
application -> application: Log response from contents of buffer

application -> application: Initialize request headers (HTTPClient_InitializeRequestHeaders)
application -> application: Add range header (HTTPClient_AddRangeHeader)
application -> requestqueue: Enqueue request

server -> httpthread: Recieve HTTP response
deactivate server
httpthread -> responsequeue: Enqueue response

requestqueue -> httpthread: Dequeue request
httpthread -> server: Send HTTP GET request (HTTPClient_Send)
activate server

responsequeue -> application: Dequeue response
application -> application: Log response from contents of buffer

server -> httpthread: Recieve HTTP response
deactivate server
httpthread -> responsequeue: Enqueue response

responsequeue -> application: Dequeue response
application -> application: Log response from contents of buffer

application -> server: End TLS session and disconnect from server

deactivate application
deactivate httpthread

@enduml