Delphi DLL

Send a Staged REST Request with a Text Body

Demonstrates Rest.SendReqStringBody, which sends a request whose text body (such as JSON) is supplied directly, then reads the response in separate steps.

Background. The staged request model separates sending from reading: a SendReq method transmits the request, ReadResponseHeader reads the status line and headers, and a ReadResp method reads the body. This gives fine control over large or streamed messages compared with the single-call full-request methods.

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var
success: Boolean;
rest: HCkRest;
bTls: Boolean;
bAutoReconnect: Boolean;
jsonBody: PWideChar;
statusCode: Integer;
responseBody: PWideChar;

begin
success := False;

rest := CkRest_Create();
bTls := True;
bAutoReconnect := True;
success := CkRest_Connect(rest,'example.com',443,bTls,bAutoReconnect);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

CkRest_AddHeader(rest,'Content-Type','application/json');

//  Send a request whose text body (such as JSON) is supplied directly.
jsonBody := '{ "name": "example" }';
success := CkRest_SendReqStringBody(rest,'POST','/api/items',jsonBody);
if (success = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;

//  After sending, read the response status line and header fields.  The return value is the HTTP
//  status code, or -1 if no response was received.
statusCode := CkRest_ReadResponseHeader(rest);
if (statusCode < 0) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
Memo1.Lines.Add('Response status code: ' + IntToStr(statusCode));

//  Read the response body as text.
responseBody := CkRest__readRespBodyString(rest);
if (CkRest_getLastMethodSuccess(rest) = False) then
  begin
    Memo1.Lines.Add(CkRest__lastErrorText(rest));
    Exit;
  end;
Memo1.Lines.Add(responseBody);

CkRest_Dispose(rest);