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我正在尝试将 Facebook 图形链接发送到 AppEngine 服务器。我收到“格式错误的字符串异常”。这是我将json发送到服务器的方法：

public async Task<string> SendJSONData(string urlToCall, string JSONData)
    {
        // server to POST to
        string url = urlToCall;

        // HTTP web request
        var httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest.ContentType = "application/x-www-form-urlencoded";
        httpWebRequest.Method = "POST";

        // Write the request Asynchronously 
        using (var stream = await Task.Factory.FromAsync<Stream>(httpWebRequest.BeginGetRequestStream,
                                                                 httpWebRequest.EndGetRequestStream, null))
        {
            //create some json string
            string json = "action=" + JSONData;

            // convert json to byte array
            byte[] jsonAsBytes = Encoding.UTF8.GetBytes(json);

            // Write the bytes to the stream
            await stream.WriteAsync(jsonAsBytes, 0, jsonAsBytes.Length);
        }

        WebResponse response = await httpWebRequest.GetResponseAsync();
        StreamReader requestReader = new StreamReader(response.GetResponseStream());
        String webResponse = requestReader.ReadToEnd();
        return webResponse; }

这是我使用 Fiddler 嗅探的内容：

POST http://x.appspot.com/register HTTP/1.1
Accept: */*
Content-Length: 376
Accept-Encoding: identity
Content-Type: application/x-www-form-urlencoded
User-Agent: NativeHost
Host: x.appspot.com
Connection: Keep-Alive
Pragma: no-cache

action={
  "mailFb": "mail@gmail.com",
  "userName": "Michael",
  "userSurname": "w00t",
  "nickname": "Michael w00t",
  "userSex": "male",
  "userAvatar": "https://graph.facebook.com/myperfectid/picture?type=large&access_token=BlahblahblahblahToken"
}

所以一切看起来都很好，但问题是我在 AppEngine 日志中收到以下错误：

2013-03-02 17:52:10.431 /register 500 56ms 0kb NativeHost
W 2013-03-02 17:52:10.427 /register com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated string at line 7 column 79 at com.google.g
C 2013-03-02 17:52:10.429 Uncaught exception from servlet com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated string at line 7 colu

我设法将问题缩小到其根源，即“&”字符。所以我的问题是，如何修复代码，以便它与 AppEngine 一起使用。哦，这是我在服务器上读取接收到的数据的方式：

gson.fromJson(reader, User.class);
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1 回答 1

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您声称您正在发送“ Content-Type: application/x-www-form-urlencoded”这一事实突出了问题，但事实
并非如此。因此错误。

的正确编码&是&amp;.

于 2013-03-04T11:46:51.930 回答