(Delphi) HTTP POST JSON

Demonstrates how to send a JSON POST and get the JSON response.

Download Chilkat HTTP ActiveX

uses
    Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
    Dialogs, StdCtrls,
    CHILKATHTTPLib_TLB,
    OleCtrls;

...

procedure TForm1.Button1Click(Sender: TObject);
var
req: TChilkatHttpRequest;
http: TChilkatHttp;
success: Integer;
jsonText: String;
resp: IChilkatHttpResponse;

begin
req := TChilkatHttpRequest.Create(Self);
http := TChilkatHttp.Create(Self);

//  Any string unlocks the component for the 1st 30 days.
success := http.UnlockComponent('Anything for 30-day trial');
if (success <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

//  This example duplicates the HTTP POST shown at
//  http://json.org/JSONRequest.html

//  Specifically, the request to be sent looks like this:
//  
POST /request HTTP/1.1
Accept: application/jsonrequest
Content-Encoding: identity
Content-Length: 72
Content-Type: application/jsonrequest
Host: json.penzance.org

{"user":"doctoravatar@penzance.com","forecast":7,"t":"vlIj","zip":94089}


//  First, remove default header fields that would be automatically
//  sent.  (These headers are harmless, and shouldn't need to
//  be suppressed, but just in case...)
http.AcceptCharset := '';
http.UserAgent := '';
http.AcceptLanguage := '';
//  Suppress the Accept-Encoding header by disallowing
//  a gzip response:
http.AllowGzip := 0;

//  If a Cookie needs to be added, it may be added by calling
//  AddQuickHeader:
http.AddQuickHeader('Cookie','JSESSIONID=1234');

jsonText := '{"user":"doctoravatar@penzance.com","forecast":7,"t":"vlIj","zip":94089}';

//  To use SSL/TLS, simply use "https://" in the URL.

//  IMPORTANT: Make sure to change the URL, JSON text,
//  and other data items to your own values.  The URL used
//  in this example will not actually work.

resp := http.PostJson('http://json.penzance.org/request',jsonText);
if (resp = nil ) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
  end
else
  begin
    //  Display the JSON response.
    Memo1.Lines.Add(resp.BodyStr);
  end;


end;