TCP Message Format and HTTP Message Format

TCP

Source Port  Destination Port
    Sequence Number
    Acknowledgment Number
Flags         Window
Checksum      Urgent Pointer
    Options
    Data

Request URL Protocol-Version\r\n
Field: Value\r\n
\r\n
Body

Protocol-Version Status-Code Status-Description\r\n
Field: Value\r\n
\r\n
Body