@startuml

skinparam dpi 300

Application -> HTTP_Client_Lib: HTTPClient_Send(<font color=red>Request Headers</font>, <font color=blue>Request Body</font>, <font color=green>Response</font>)
activate HTTP_Client_Lib #lightgreen

HTTP_Client_Lib -> Application: transport send(<font color=red>Request Headers</font>)
activate Application #lightblue
Application -> Application: Send <font color=red>Request Headers</font> over the network.
Application --> HTTP_Client_Lib: Return SUCCESS
deactivate Application
note right: **transport send** is repeated if\nfewer bytes than requested to\nsend are sent.\nFor the sake of simplicity this\nexample returns successfully\nfrom the transport interface.

HTTP_Client_Lib -> Application: transport send(<font color=blue>Request Body</font>)
activate Application #lightblue
Application -> Application: Send <font color=blue>Request Body</font> over the network.
Application --> HTTP_Client_Lib: Return SUCCESS
deactivate Application

loop While <font color=darkgreen>response buffer</font> is NOT full &&\nResponse message is NOT complete &&\nNo errors found in parsing
    HTTP_Client_Lib -> Application: transport read(<font color=darkgreen>Response buffer</font>)
    activate Application #lightblue
    Application -> Application: Receive network data into the <font color=darkgreen>Response buffer</font>.
    Application --> HTTP_Client_Lib: Return SUCCESS
    deactivate Application

    HTTP_Client_Lib -> HTTP_Client_Lib: Parse <font color=green>Response</font>
    activate HTTP_Client_Lib #darkgreen

        loop for each response header found in parsing
            HTTP_Client_Lib -> Application: __**onHeaderCallback**__(<font color=green>Response Header Field</font>,\n                                <font color=green>Response Header Value</font>,\n                                <font color=green>Response Status</font>)
            activate Application #lightblue
            Application -> Application: Do stuff with the Header
            Application --> HTTP_Client_Lib: Return
            deactivate Application
        end
    deactivate HTTP_Client_Lib
end


HTTP_Client_Lib --> Application: Return HTTP_RETURN_CODE
deactivate HTTP_Client_Lib
@enduml