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Working with a Stateless Protocol

By Tony Marston
2006-08-13

Introduction

Introduction

Before switching to web development and the stateless HTTP protocol I spent several decades developing client-server systems which were statefull. These came in several flavours:

  • "Thin" client with dumb "green screen" terminals connected to a central mini-computer acting as both the application server and database server. Two different protocols were used:
    • Character mode - where each key press is transmitted to the server, then echoed back to the client.
    • Block mode - where the user fills in a form and presses the ENTER key to transmit the whole form to the server.
  • "Thick" client with networked PCs connected to a central database server, with the PCs using a GUI.

You should notice that the old block mode protocol with its ENTER key is quite similar to the new HTML form with its SUBMIT button.




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