Delphi:将 Google URL Shortener 与 IdHTTP 结合使用 - 400 错误请求 [英] Delphi: Using Google URL Shortener with IdHTTP - 400 Bad Request

问题描述

我正在尝试通过其 API 访问 URL Shortener ( http://goo.gl/ )在德尔福内部.但是，我得到的唯一结果是:HTTP/1.0 400 Bad Request(原因:parseError)

I'm trying to access the URL Shortener ( http://goo.gl/ ) via its API from within Delphi. However, the only result I get is: HTTP/1.0 400 Bad Request (reason: parseError)

这是我的代码(在带有 Button1、Memo1 和 IdHTTP1 的表单上，其中 IdSSLIOHandlerSocketOpenSSL1 作为它的 IOHandler.我从 http://indy.fulgan.com/SSL/<获得了必要的 32 位 OpenSSL DLL/a> 并将它们放在 .exe 的目录中):

Here is my code (on a form with a Button1, Memo1 and IdHTTP1 that has IdSSLIOHandlerSocketOpenSSL1 as its IOHandler. I got the necessary 32-bit OpenSSL DLLs from http://indy.fulgan.com/SSL/ and put them in the .exe's directory):

procedure TFrmMain.Button1Click(Sender: TObject);
    var html, actionurl: String;
    makeshort: TStringList;
begin
try
 makeshort := TStringList.Create;

 actionurl := 'https://www.googleapis.com/urlshortener/v1/url';
 makeshort.Add('{"longUrl": "http://slashdot.org/stories"}');

 IdHttp1.Request.ContentType := 'application/json';
 //IdHTTP1.Request.ContentEncoding := 'UTF-8'; //Using this gives error 415

 html := IdHTTP1.Post(actionurl, makeshort);
 memo1.lines.add(idHTTP1.response.ResponseText);

     except on e: EIdHTTPProtocolException do
        begin
            memo1.lines.add(idHTTP1.response.ResponseText);
            memo1.lines.add(e.ErrorMessage);
        end;
    end;

 memo1.Lines.add(html);
 makeshort.Free;
end;

更新: 在这个例子中我没有使用我的 API 密钥(如果没有一个通常应该可以很好地尝试几次)，但是如果你想用你自己的来尝试它，你可以替换actionurl 字符串与'https://www.googleapis.com/urlshortener/v1/url?key=';

Update: I have left off my API key in this example (should usually work well without one for a few tries), but if you want to try it with your own, you can substitute the actionurl string with 'https://www.googleapis.com/urlshortener/v1/url?key=<yourapikey>';

ParseError 消息让我相信 longurl 发布时的编码可能有问题，但我不知道要更改什么.

The ParseError message leads me to believe that there might be something wrong with the encoding of the longurl when it gets posted but I wouldn't know what to change.

我已经模糊了很长一段时间，我确信这个错误就在我眼前 - 我只是现在没有看到它.因此，非常感谢任何帮助！

I've been fuzzing over this for quite a while now and I'm sure the mistake is right before my eyes - I'm just not seeing it right now. Any help is therefore greatly appreciated!

谢谢！

推荐答案

正如您所发现的，TIdHTTP.Post() 方法的 TStrings 重载版本是错误的使用的方法.它发送一个 application/x-www-form-urlencoded 格式的请求，这不适用于 JSON 格式的请求.您必须改用 TIdHTTP.Post() 方法的 TStream 重载版本`，例如:

As you discovered, the TStrings overloaded version of the TIdHTTP.Post() method is the wrong method to use. It sends an application/x-www-form-urlencoded formatted request, which is not appropriate for a JSON formatted request. You have to use the TStream overloaded version of the TIdHTTP.Post() method instead`, eg:

procedure TFrmMain.Button1Click(Sender: TObject); 
var
  html, actionurl: String; 
  makeshort: TMemoryStream; 
begin 
  try
    makeshort := TMemoryStream.Create; 
    try 
      actionurl := 'https://www.googleapis.com/urlshortener/v1/url'; 
      WriteStringToStream(makeshort, '{"longUrl": "http://slashdot.org/stories"}', IndyUTF8Encoding); 
      makeshort.Position := 0;

      IdHTTP1.Request.ContentType := 'application/json'; 
      IdHTTP1.Request.Charset := 'utf-8';

      html := IdHTTP1.Post(actionurl, makeshort); 
    finally
      makeshort.Free; 
    end;

    Memo1.Lines.Add(IdHTTP1.Response.ResponseText); 
    Memo1.Lines.Add(html); 
  except
    on e: Exception do 
    begin 
      Memo1.Lines.Add(e.Message); 
      if e is EIdHTTPProtocolException then
        Memo1.lines.Add(EIdHTTPProtocolException(e).ErrorMessage); 
    end; 
  end; 
end; 

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