Delphi ActiveX

HTTP Methods - GET and DELETE

Demonstrate a method for sending HTTP requests that don't have a request body, such as for GET or DELETE requests. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
http: TChilkatHttp;
url: WideString;
resp: TChilkatHttpResponse;
statusCode: Integer;

begin
success := 0;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

http := TChilkatHttp.Create(Self);

// Specifiy a session log file so we can see the exact request/response
http.SessionLogFilename := 'c:/aaworkarea/sessionLog.txt';

// Perhaps add a custom header or two..
http.SetRequestHeader('x-exz-date','20201012T235046Z');
http.SetRequestHeader('x-exz-id','1234');

// Send a GET request to https://www.example.com/someting?param1=123&param2=abc
url := 'https://www.example.com/someting?param1=123&param2=abc';
resp := TChilkatHttpResponse.Create(Self);
success := http.HttpNoBody('GET',url,resp.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// The GET request that is sent looks like this.
// The Accept and Accept-Encoding headers are automatically added by default.

// 	GET /someting?param1=123&param2=abc HTTP/1.1
// 	Host: www.example.com
// 	Accept: */*
// 	Accept-Encoding: gzip
// 	x-exz-date: 20201012T235046Z
// 	x-exz-id: 1234

// Get the response status
statusCode := resp.StatusCode;
Memo1.Lines.Add('Response status: ' + IntToStr(statusCode));

// Get the response body
Memo1.Lines.Add(resp.BodyStr);

// -------------------------------------------------------------
// Let's say we want to send a DELETE request, and we only want to accept an application/json response,
// and we don't want gzipped responses...

// First remove the previously specified custom headers.
http.ClearHeaders();

// Indicate we only accept application/json non-gzipped responses.
http.Accept := 'application/json';
http.AllowGzip := 0;

// Send a DELETE request to https://www.example.com/deleteSomething
url := 'https://www.example.com/deleteSomething';
success := http.HttpNoBody('DELETE',url,resp.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// The DELETE request that is sent looks like this.
// The empty Accept-Encoding header value means we only want non-compressed responses.

// 	DELETE /deleteSomething HTTP/1.1
// 	Host: www.example.com
// 	Accept: application/json
// 	Accept-Encoding: 

// Get the response status
statusCode := resp.StatusCode;
Memo1.Lines.Add('Response status: ' + IntToStr(statusCode));

// Get the response body
Memo1.Lines.Add(resp.BodyStr);
end;