Client                                            Server

 ClientHello
  + early_data
  + psk_key_exchange_modes                                +--------+
  + key_share*                                            | Flight |
  + pre_shared_key                                        +--------+
 (Application Data*)     -------->

                                             ServerHello
                                        + pre_shared_key
                                            + key_share*  +--------+
                                   {EncryptedExtensions}  | Flight |
                                              {Finished}  +--------+
                       <--------     [Application Data*]


                                                          +--------+
 {Finished}            -------->                          | Flight |
 [Application Data*]                                      +--------+

                                                          +--------+
                       <--------                   [ACK]  | Flight |
                                     [Application Data*]  +--------+

 [Application Data]    <------->      [Application Data]