How to resolve the algorithm Hello world/Web server step by step in the Delphi programming language

Published on 12 May 2024 09:40 PM
#Delphi

How to resolve the algorithm Hello world/Web server step by step in the Delphi programming language

Table of Contents

Problem Statement

The browser is the new GUI !

Serve our standard text   Goodbye, World!   to   http://localhost:8080/   so that it can be viewed with a web browser. The provided solution must start or implement a server that accepts multiple client connections and serves text as requested. Note that starting a web browser or opening a new window with this URL is not part of the task. Additionally, it is permissible to serve the provided page as a plain text file (there is no requirement to serve properly formatted HTML here). The browser will generally do the right thing with simple text like this.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Hello world/Web server step by step in the Delphi programming language

Source code in the delphi programming language

program HelloWorldWebServer;

{$APPTYPE CONSOLE}

uses SysUtils, IdContext, IdCustomHTTPServer, IdHTTPServer;

type
  TWebServer = class
  private
    FHTTPServer: TIdHTTPServer;
  public
    constructor Create;
    destructor Destroy; override;
    procedure HTTPServerCommandGet(AContext: TIdContext;
      ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
  end;

constructor TWebServer.Create;
begin
  FHTTPServer := TIdHTTPServer.Create(nil);
  FHTTPServer.DefaultPort := 8080;
  FHTTPServer.OnCommandGet := HTTPServerCommandGet;
  FHTTPServer.Active := True;
end;

destructor TWebServer.Destroy;
begin
  FHTTPServer.Active := False;
  FHTTPServer.Free;
  inherited Destroy;
end;

procedure TWebServer.HTTPServerCommandGet(AContext: TIdContext;
  ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
begin
  AResponseInfo.ContentText := 'Goodbye, World!';
end;

var
  lWebServer: TWebServer;
begin
  lWebServer := TWebServer.Create;
  try
    Writeln('Delphi Hello world/Web server ');
    Writeln('Press Enter to quit');
    Readln;
  finally
    lWebServer.Free;
  end;
end.

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