Google API - >创建一个新日历 - >解析错误

时间:2012-11-28 09:28:18

标签: c# google-api google-calendar-api

我正在尝试按照documentation通过Google API创建日历。我试图避免使用客户端库并通过自定义webrequests与API进行所有通信,到目前为止一直运行良好,但在这个特定的一个我正在努力解决“解析错误”

请不要参考使用客户端库的解决方案( service.calendars()。insert(...))。

这是我的代码的一个愚蠢版本(仍然无效):

var url = string.Format
(
    "https://www.googleapis.com/calendar/v3/calendars?key={0}",
    application.Key
);

var httpWebRequest = HttpWebRequest.Create(url) as HttpWebRequest;
httpWebRequest.Headers["Authorization"] = 
    string.Format("Bearer {0}", user.AccessToken.Token);                    
httpWebRequest.Method = "POST";
httpWebRequest.ContentType = "application/json";
httpWebRequest.CookieContainer = new CookieContainer();

// Obviously the real code will serialize an object in our system.
// I'm using a dummy request for now,
// just to make sure that the problem is not the serialization.
var requestText =
      "{" + Environment.NewLine
    + "\"summary\": \"test123\"" + Environment.NewLine
    + "}" + Environment.NewLine
    ;

using (var stream = httpWebRequest.GetRequestStream())
using (var streamWriter = new System.IO.StreamWriter(stream))
{
    streamWriter.Write(System.Text.Encoding.UTF8.GetBytes(requestText));
}

// GetSafeResponse() is just an extension that catches the WebException (if any)
// and returns the WebException.Response instead of crashing the program.
var httpWebResponse = httpWebRequest.GetSafeResponse();

正如你所看到的,我已经放弃了现在发送序列化对象的问题,而我只是试图让它处理一个非常简单的虚拟请求:

{
"summary": "test123"
}

然而,答案仍然只是:

{
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "parseError",
    "message": "Parse Error"
   }
  ],
  "code": 400,
  "message": "Parse Error"
 }
}

accessToken有效且未过期,应用程序密钥正确。

我做错了什么或错过了什么?

提前致谢,

2 个答案:

答案 0 :(得分:2)

我不确定这会解决您的问题,但需要注意几点 在这种情况下,请不要使用Environment.NewLine,如果您的代码在Windows,Mac或Linux上运行,则不应更改网络流量。 Http 1.1需要CRLF

您正在将帖子正文编码为UTF-8是的,您没有告诉服务器您正在使用哪种编码。你的所有字符都是低位ASCII,所以这不重要,但为了完整,你的内容类型应该是

 httpWebRequest.ContentType = "application/json ; charset=UTF-8";

除此之外我无法看到您的代码存在问题,最好是附上一个透明的回显代理(Charles或fiddler),以便您可以通过网络查看您的请求是什么样的。来自日历examples,他们正在发送

请求

POST https://www.googleapis.com/calendar/v3/calendars?key={YOUR_API_KEY}

Content-Type:  application/json
Authorization:  Bearer ya29.AHES6ZR3F6ByTg1eKVkjegKyWIukodK8KGSzY-ea1miGKpc
X-JavaScript-User-Agent:  Google APIs Explorer

{
 "summary": "Test Calendar"
}

响应

200 OK

- Show headers -

{

 "kind": "calendar#calendar",
 "etag": "\"NybCyMgjkLQM6Il-p8A5652MtaE/ldoGyKD2MdBs__AsDbQ2rHLfMpk\"",
 "id": "google.com_gqua79l34qk8v30bot94celnq8@group.calendar.google.com",
 "summary": "Test Calendar"
}

希望有所帮助,意识到它可能没有。

答案 1 :(得分:1)

我想出来并让它发挥作用!

虽然大卫的建议并不是他们自己的解决方案,但是他告诉我使用数据包嗅探器(我最终使用的是Wireshark,但这不是真正的重点),这让我走上正轨。

事实证明,在我愚蠢的代码中有两个错误。一个如此明显的明显,它让我脸红,一个稍微狡猾。

首先,

using (var streamWriter = new StreamWriter(stream))
{
    streamWriter.Write(Encoding.UTF8.GetBytes(requestText));
}

当然应该是

using (var streamWriter = new StreamWriter(stream, Encoding.UTF8))
{
    streamWriter.Write(requestText);
}

作为streamWriter.Write对参数和Byte []执行ToString()。ToString()只返回“System.Byte []”。尴尬!

其次,默认的UTF8编码添加字节顺序标记\ 357 \ 273 \ 277,就谷歌而言,这也会使内容无效。我找到了如何在stackoverflow上修复此问题here

因此,对于任何挣扎于此的人来说,这是最终的解决方案。

var url = string.Format
(
    "https://www.googleapis.com/calendar/v3/calendars?key={0}",
    application.Key
);

var httpWebRequest = HttpWebRequest.Create(url) as HttpWebRequest;
httpWebRequest.Headers["Authorization"] = 
    string.Format("Bearer {0}", user.AccessToken.Token);                    
httpWebRequest.Method = "POST";
// added the character set to the content-type as per David's suggestion
httpWebRequest.ContentType = "application/json; charset=UTF-8";
httpWebRequest.CookieContainer = new CookieContainer();

// replaced Environment.Newline by CRLF as per David's suggestion
var requestText = string.Join
(
    "\r\n",
    "{",
    " \"summary\": \"Test Calendar 123\"",
    "}"
);

using (var stream = httpWebRequest.GetRequestStream())
// replaced Encoding.UTF8 by new UTF8Encoding(false) to avoid the byte order mark
using (var streamWriter = new StreamWriter(stream, new UTF8Encoding(false)))
{
    streamWriter.Write(requestText);
}

希望这有助于某人!