DELETE request with body from TRESTRequest

ghz 8months ago ⋅ 105 views

I know, that TRESTRequest is not designed to send body in DELETE requests. But these days many servers accept such requests.

Is there a way to somehow get around this component flaw?

For example, this can be done with TIdHTTP.

P.S. Indeed, TRESTRequest supports DELETE request with a body in Embarcadero Delphi version 10.3 and later. (version 10.2 and earlier - does not support)

Answers

In Delphi, if you're using a version earlier than 10.3 and need to send a DELETE request with a body using TRESTRequest, you can work around this limitation by manually constructing and sending the request using the underlying TNetHTTPClient component.

Here's how you can do it:

uses
  System.Net.HttpClient, System.Net.URLClient, System.Classes, System.SysUtils;

procedure SendDeleteRequestWithBody(const AURL: string; const ABody: string);
var
  LHTTPClient: TNetHTTPClient;
  LRequest: TNetHTTPRequest;
  LContent: TStringStream;
begin
  LHTTPClient := TNetHTTPClient.Create(nil);
  LRequest := TNetHTTPRequest.Create(nil);
  LContent := TStringStream.Create(ABody);

  try
    // Set the HTTP method to DELETE
    LRequest.Method := TNetHTTPMethod.Delete;
    // Set the URL
    LRequest.URL := AURL;
    // Set the request body
    LRequest.SourceStream := LContent;

    // Send the request
    LHTTPClient.Client := LRequest;
    LHTTPClient.Execute(LRequest);

    // Handle the response if needed
    // For example:
    // ShowMessage(LRequest.ResponseContent);
  finally
    LHTTPClient.Free;
    LRequest.Free;
    LContent.Free;
  end;
end;

// Usage example:
begin
  SendDeleteRequestWithBody('https://example.com/api/resource', '{"key": "value"}');
end;

In this example, SendDeleteRequestWithBody function sends a DELETE request with a body to the specified URL. It creates an instance of TNetHTTPClient and TNetHTTPRequest, sets the HTTP method to DELETE, sets the URL, and sets the request body using a TStringStream. Then, it executes the request and handles the response if needed.

This approach allows you to send a DELETE request with a body using Delphi versions earlier than 10.3. However, it's important to note that this workaround relies on the TNetHTTPClient component, which may have different capabilities and behavior compared to TRESTRequest.

#rest