Delphi Indy POST 文件在 TIdMultiPartFormDataStream 中没有 "fieldname"

Question

使用Delphi 10.1。需要将图像发送到此站点：www.flagma.ru

在嗅探器请求中：

URL:https://flagma.ru/messageuploadphoto.php?qqfile=111.jpg
Accept: */*
Accept-Encoding: gzip, deflate, br
Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3
Content-Type: application/octet-stream
Referer: https://flagma.ru/my/1538481/podat-obyavlenie.html
X-File-Name:111.jpg
X-Mime-Type: image/jpeg
X-Requested-With: XMLHttpRequest

我的 Delphi 尝试：

http.Request.ContentType := 'application/octet-stream';
  http.Request.Accept := '*/*';
  http.Request.AcceptLanguage := 'ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7';
  http.Request.AcceptEncoding := 'gzip, deflate';
  http.Request.Referer := 'https://flagma.ru/my/1538481/podat-obyavlenie.html';

  fnShort := ExtractFileName(fn); // fn - full image file
  url := 'https://flagma.ru/messageuploadphoto.php?qqfile=' + fnShort;
  http.Request.CustomHeaders.AddValue('X-Mime-Type', 'image/jpeg');
  http.Request.CustomHeaders.AddValue('X-File-Name', fnShort);
  http.Request.CustomHeaders.AddValue('X-Requested-With', 'XMLHttpRequest');

  (* it is wrong way
  a := TStringStream.Create(tempa);
  formData := TIdMultiPartFormDataStream.Create;
  formData.Clear; 
  formData.AddFile('qqfile', fn, GetMIMETypeFromFile(fn));

  try
    http.Post(url, formData, a);
  except
    on E: EIdException do
    begin
      response := '';
    end;
  end;
  formData.Free;
  response := utf8Decode(a.DataString);
 *)

解决方案就是：response := http.Post(url, fn);

出现错误：Imagу 的宽度和高度较小。但是在浏览器中相同的文件是可以的。

Answer 1

您的服务器希望文件按原样发布在 POST 正文中。因此，您需要使用采用普通 TStream 的 TIdHTTP.Post() 的重载版本，例如 TFileStream，而不是使用采用 TIdMultipartFormDataStream 的重载：

http.Request.ContentType := 'application/octet-stream';
http.Request.Accept := '*/*';
http.Request.AcceptLanguage := 'ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7';
//http.Request.AcceptEncoding := 'gzip, deflate';
http.Request.Referer := 'https://flagma.ru/my/1538481/podat-obyavlenie.html';

fnShort := ExtractFileName(fn); // fn - full image file
url := 'https://flagma.ru/messageuploadphoto.php?qqfile=' + fnShort;
http.Request.CustomHeaders.Values['X-Mime-Type'] := GetMIMETypeFromFile(fn);
http.Request.CustomHeaders.Values['X-File-Name'] := fnShort;
http.Request.CustomHeaders.Values['X-Requested-With'] := 'XMLHttpRequest';

fs := TFileStream.Create(fn, fmOpenRead or fmShareDenyWrite);
try
  try
    response := http.Post(url, fs);
  except
    response := '';
  end;
finally
  fs.Free;
end;

{ alternatively: you can pass the full file path to Post()...
try
  response := http.Post(url, fn);
except
  response := '';
end;}

Delphi Indy POST 文件在 TIdMultiPartFormDataStream 中没有 "fieldname"

Delphi Indy POST file without "fieldname" in TIdMultiPartFormDataStream

file

delphi

post

indy