Delphi DLL

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 DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
http: HCkHttp;
url: PWideChar;
resp: HCkHttpResponse;
statusCode: Integer;

begin
success := False;

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

http := CkHttp_Create();

// Specifiy a session log file so we can see the exact request/response
CkHttp_putSessionLogFilename(http,'c:/aaworkarea/sessionLog.txt');

// Perhaps add a custom header or two..
CkHttp_SetRequestHeader(http,'x-exz-date','20201012T235046Z');
CkHttp_SetRequestHeader(http,'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 := CkHttpResponse_Create();
success := CkHttp_HttpNoBody(http,'GET',url,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    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 := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response status: ' + IntToStr(statusCode));

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

// -------------------------------------------------------------
// 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.
CkHttp_ClearHeaders(http);

// Indicate we only accept application/json non-gzipped responses.
CkHttp_putAccept(http,'application/json');
CkHttp_putAllowGzip(http,False);

// Send a DELETE request to https://www.example.com/deleteSomething
url := 'https://www.example.com/deleteSomething';
success := CkHttp_HttpNoBody(http,'DELETE',url,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    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 := CkHttpResponse_getStatusCode(resp);
Memo1.Lines.Add('Response status: ' + IntToStr(statusCode));

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

CkHttp_Dispose(http);
CkHttpResponse_Dispose(resp);

end;