(Delphi ActiveX) REST URL Encode Path Parts and Query Params

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When passing a path to a Chilkat REST function, the path parts and query params should be URL encoded. This example explains..

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

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
rest: TChilkatRest;
bTls: Integer;
port: Integer;
bAutoReconnect: Integer;
success: Integer;
authAws: TChilkatAuthAws;
path: WideString;
sbPath: TChilkatStringBuilder;
responseJson: WideString;

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

// This example demonstrates how to URL encode the path passed to a REST function.
// It is demonstrated with an Amazon SP API GET request to get details about a listings item for a selling partner.
// See https://developer-docs.amazon.com/sp-api/docs/listings-items-api-v2021-08-01-reference#getlistingsitem

rest := TChilkatRest.Create(Self);

// Connect to the REST server.
bTls := 1;
port := 443;
bAutoReconnect := 1;
success := rest.Connect('sellingpartnerapi-eu.amazon.com',port,bTls,bAutoReconnect);

rest.ClearAllQueryParams();
rest.AddQueryParam('marketplaceids','XYZABC123');
rest.AddQueryParam('includedData','offers');

rest.AddHeader('x-amz-access-token','YOUR_ACCESS_TOKEN');

authAws := TChilkatAuthAws.Create(Self);
authAws.AccessKey := 'YOUR_AWS_APP_ID';
authAws.SecretKey := 'YOUR_AWS_APP_SECRET_KEY';
authAws.Region := 'eu-west-1';
authAws.ServiceName := 'execute-api';
rest.SetAuthAws(authAws.ControlInterface);

// The path that is passed to FullRequestNobBody

// Here's a sample path that is not yet URL encoded.
path := '/listings/2022-07-01/items/ABCDEFGHIJ/100x100_28g_LANCETS(BOXED)';

// The path passed to FullRequestNoBody needs to have the parts URL-encoded.
// The "/" chars are not URL encoded, but the individual path parts should be URL encoded.
// For example:  /listings/2022-07-01/items/ABCDEFGHIJ/100x100_28g_LANCETS%28BOXED%29

// In this case, we'll prepare the path like this:
sbPath := TChilkatStringBuilder.Create(Self);
sbPath.Append('100x100_28g_LANCETS(BOXED)');
// URL encode the contents of the sbPath.
sbPath.Encode('url','utf-8');
// Prepend the remaining which does not need to be URL encoded.
sbPath.Prepend('/listings/2022-07-01/items/ABCDEFGHIJ/');

Memo1.Lines.Add('URL encoded path: ' + sbPath.GetAsString());

responseJson := rest.FullRequestNoBody('GET',sbPath.GetAsString());
if (rest.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(rest.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add(responseJson);
Memo1.Lines.Add('----');
end;