Question

我正在使用UnityHTTP（https://github.com/andyburke/UnityHTTP）来调用REST API（KiiCloud http://www.kii.com）并且它工作得很好但我想尽可能摆脱第三方库并使用Unity的WWW和WWWForm实现了同样的目标。

这是使用UnityHTTP工作正常的代码：

public static void RunServerExtension (string appId, string appKey, string endpoint, string kii_access_token, string msg)
{
    Hashtable data = new Hashtable();
    // Add json fields with values here (use as dictionary)
    data.Add("message", msg);

    // When you pass a Hashtable as the third argument, we assume you want it send as JSON-encoded
    // data.  We'll encode it to JSON for you and set the Content-Type header to application/json
    HTTP.Request myRequest = new HTTP.Request( "post", "https://api.kii.com/api/apps/" + appId + "/server-code/versions/current/" + endpoint, data);

    myRequest.AddHeader("x-kii-appid", appId);
    myRequest.AddHeader("x-kii-appkey", appKey);
    if(kii_access_token != null)
            theRequest.AddHeader("Authorization", "Bearer " + kii_access_token);

    myRequest.Send( ( request ) => {
        // we provide Object and Array convenience methods that attempt to parse the response as JSON
        // if the response cannot be parsed, we will return null
        // note that if you want to send json that isn't either an object ({...}) or an array ([...])
        // that you should use JSON.JsonDecode directly on the response.Text, Object and Array are
        // only provided for convenience
        Hashtable result = request.response.Object;
        if ( result == null )
        {
            Debug.LogWarning( "Could not parse JSON response!" );
            return;
        }
        Debug.Log ("Got response");
        Debug.Log(request.response.Text);   
    });
}

所以上面的工作正常，但是当我以这种方式切换到WWWForm时：

public static WWW RunServerExtension (string appId, string appKey, string endpoint, string kii_access_token, string msg)
{
    WWWForm form = new WWWForm();
    Hashtable headers = form.headers;
    headers["Content-Type"] = "application/json";
    headers["x-kii-appid"] = appId;
    headers["x-kii-appkey"] = appKey;
    if(kii_access_token != null)
        headers["Authorization"] = "Bearer " + kii_access_token;
    form.AddField("message", msg);
    return new WWW("https://api.kii.com/api/apps/" + appId + "/server-code/versions/current/" + endpoint, form.data, headers);
}

private IEnumerator WaitForRequest(WWW www)
{
    yield return www;

    // check for errors
    if (www.error == null)
    {
        Debug.Log("WWW Ok!: " + www.text);
    } else {
        Debug.Log("WWW Error: "+ www.error);
    }    
}

我在服务器端得到了一个不好的请求（意味着请求格式错误，而不是服务器所期望的）。请注意，标头必须作为参数传递，否则服务器会抱怨缺少标头。

我怀疑这可能与服务器需要JSON数据这一事实有关，因此我使用UnityHTTP JSON类将消息转换为JSON（您可以使用该隔离类进行JSON编码/解码）https://github.com/andyburke/UnityHTTP/blob/master/external/JSON.cs所以这方法传递 {“message”：“这是回声!!”} 作为数据：

public static WWW RunServerExtension (string appId, string appKey, string endpoint, string kii_access_token, string msg)
{
    WWWForm form = new WWWForm();
    Hashtable headers = form.headers;
    headers["Content-Type"] = "application/json";
    headers["x-kii-appid"] = appId;
    headers["x-kii-appkey"] = appKey;
    if(kii_access_token != null)
        headers["Authorization"] = "Bearer " + kii_access_token;
    Hashtable data = new Hashtable();
    data["message"] = msg;
    byte[] bytes = GetBytes(JSON.JsonEncode(data));
    return new WWW("https://api.kii.com/api/apps/" + appId + "/server-code/versions/current/" + endpoint, bytes, headers);
}

static byte[] GetBytes(string str)
{
    byte[] bytes = new byte[str.Length * sizeof(char)];
    System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);
    return bytes;
}

但仍然是相同的不良请求。你明白为什么会失败吗？为什么UnityHTTP有效？

Answer 1

正如我在评论中提到的那样：C# converts all strings to UTF-16。如果您的网络服务器期望不同的编码，只需逐字传递字节就不会产生良好的结果。

JSON is typically encoded in UTF-8，但最好是API明确指定其输入/输出编码。

今天我花了一点时间。如果您查看UnityHTTP的来源，则可以看到their Hashtable constructor encodes JSON in UTF-8：

    this.bytes = Encoding.UTF8.GetBytes( JSON.JsonEncode( data ) );

您的代码不会更改字符串的编码，这意味着您发送了错误的字节。

使用WWWForm格式错误的HTTP帖子

1 个答案: