如何修复来自 Microsoft Azure 计算机视觉服务的 400 响应传入

Question

我在 RapidAPI 上订阅了Computer Vision API。当我在 RapidAPI 平台上测试 API 时，它运行良好。但是当我从我的应用程序中调用它时，它会响应 400 Bad request。

我该如何解决这个问题？

我正在使用 RESTSharp 库。

这是我的代码 -

public static IRestResponse GetClassifiedImageData()
{
    var client = new RestClient("{Client Path}");
    var request = new RestRequest(Method.POST);
    request.AddHeader("x-rapidapi-host", "{Rapid API host}");
    request.AddHeader("x-rapidapi-key", "{My API key}");
    request.AddHeader("content-type", "application/json");
    request.AddHeader("accept", "application/json");
    request.AddParameter("application/json", "{\"url\":\"Image URL\"}", ParameterType.RequestBody);
    return client.Execute(request);
}

如果我异步调用，我会收到这条消息 -

System.Runtime.CompilerServices.AsyncTaskMethodBuilder1+AsyncStateMachineBox1[System.String,ComputerVision.Program+d__2]

异步代码-

public static async Task<IRestResponse> GetClassifiedImageData2()
{
    var client = new RestClient("{Client Path}");
    var request = new RestRequest(Method.POST);
    request.AddHeader("x-rapidapi-host", "{Rapid API host}");
    request.AddHeader("x-rapidapi-key", "{My API key}");
    request.AddHeader("content-type", "application/json");
    request.AddHeader("accept", "application/json");
    request.AddParameter("application/json", "{\"url\":\"Image URL\"}", ParameterType.RequestBody);
    return await client.ExecuteAsync(request);
}

这些我都试过了-

• 重新启动 Visual Studio。
• 清理临时文件和预取文件。

Answer 1

根据我的测试，是 URL 编码导致了问题。

您可以使用 Rapid API 网站上的代码示例。 但是，在使用RestClient 时，您不应该对 urlpath 进行 urlencode。 Rapid API 工程师在这里可能会犯错误。在大多数情况下，, 字符不需要进行 urlencoded。因此，您可以直接使用https://microsoft-azure-microsoft-computer-vision-v1.p.rapidapi.com/analyze?visualfeatures=Categories,Tags,Color,Faces,Description 作为路径字符串。

而且，无论如何，正确的编码字符串是https://microsoft-azure-microsoft-computer-vision-v1.p.rapidapi.com/analyze?visualfeatures=Categories%2cTags%2cColor%2cFaces%2cDescription

Rapid API 的代码示例：

我使用了示例，得到的错误信息与您的相同。但我通过使用原始字符串或正确的编码字符串解决了它：

public static async Task<IRestResponse> GetClassifiedImageDataAsync()
{
    // The correct encoded string will work
    //var client = new RestClient("https://microsoft-azure-microsoft-computer-vision-v1.p.rapidapi.com/analyze?visualfeatures=Categories%2cTags%2cColor%2cFaces%2cDescription");

    // The original string will work 
    var client = new RestClient("https://microsoft-azure-microsoft-computer-vision-v1.p.rapidapi.com/analyze?visualfeatures=Categories,Tags,Color,Faces,Description");

    var request = new RestRequest(Method.POST);
    request.AddHeader("x-rapidapi-host", "microsoft-azure-microsoft-computer-vision-v1.p.rapidapi.com");
    request.AddHeader("x-rapidapi-key", "71a69********************************3ddb");
    request.AddHeader("content-type", "application/json");
    request.AddHeader("accept", "application/json");
    request.AddParameter("application/json", "{\"url\":\"https://upload.wikimedia.org/wikipedia/commons/1/11/Kanye_West_at_the_2009_Tribeca_Film_Festival.jpg\"}", ParameterType.RequestBody);
    return await client.ExecuteAsync(request);
}

static void Main(string[] args)
{
    var result = GetClassifiedImageDataAsync().GetAwaiter().GetResult();
    Console.WriteLine(result.Content);
}

您也可以使用RestClient的方法添加查询字符串：

public static async Task<IRestResponse> GetClassifiedImageDataAsync()
{
    // Without query string
    var client = new RestClient("https://microsoft-azure-microsoft-computer-vision-v1.p.rapidapi.com/analyze");

    var request = new RestRequest(Method.POST);

    // Add as query string manually
    request.AddParameter("visualfeatures", "Categories,Tags,Color,Faces,Description", ParameterType.QueryString);

    request.AddHeader("x-rapidapi-host", "microsoft-azure-microsoft-computer-vision-v1.p.rapidapi.com");
    request.AddHeader("x-rapidapi-key", "71a69********************************3ddb");
    request.AddHeader("content-type", "application/json");
    request.AddHeader("accept", "application/json");
    request.AddParameter("application/json", "{\"url\":\"https://upload.wikimedia.org/wikipedia/commons/1/11/Kanye_West_at_the_2009_Tribeca_Film_Festival.jpg\"}", ParameterType.RequestBody);
    return await client.ExecuteAsync(request);
}

以及成功的结果：