Delphi DLL Requires Chilkat v11.0.0+

Example: Http.HttpJson method - Send a POST with JSON Body

See more HTTP Examples

Demonstrates how to call the HttpJson method, which sends an HTTP POST with a JSON body. This example sends the following request:

POST /echo_request_body.asp HTTP/1.1
Host: chilkatsoft.com
Accept: */*
Accept-Encoding: gzip
Content-Type: application/json
Content-Length: 26

{"greeting":"Hello World"}

Also see: Chilkat Http Default and Auto-Filled Headers

Delphi DLL

var
success: Boolean;
http: HCkHttp;
json: HCkJsonObject;
url: PWideChar;
resp: HCkHttpResponse;

begin
success := False;

http := CkHttp_Create();
success := False;

json := CkJsonObject_Create();

//  Build the following JSON:  {"greeting":"Hello World"}
CkJsonObject_UpdateString(json,'greeting','Hello World');

//  This URL echoes the contents of the request body, letting us view it.
url := 'https://chilkatsoft.com/echo_request_body.asp';

//  Send a POST with the JSON in the HTTP request body.
resp := CkHttpResponse_Create();
success := CkHttp_HttpJson(http,'POST',url,json,'application/json',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add('Response Status Code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));

//  Examine the request we sent.
//  The LastHeader property stores the HTTP request header of the most recent request sent,
//  and in this instance, the response body mirrors the request body.
Memo1.Lines.Add(CkHttp__lastHeader(http));
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));

//  Output:

//  POST /echo_request_body.asp HTTP/1.1
//  Host: chilkatsoft.com
//  Accept: */*
//  Accept-Encoding: gzip
//  Content-Type: application/json
//  Content-Length: 26
//  
//  {"greeting":"Hello World"}

CkHttp_Dispose(http);
CkJsonObject_Dispose(json);
CkHttpResponse_Dispose(resp);