为什么从 appcelerator 调用谷歌云视觉 API 时会得到无效的 JSON 有效负载? [英] Why do I get invalid JSON payload when calling google cloud vision API from appcelerator?

问题描述

我试图使用 Alloy Appcelerator 的 Google Vision API v1

I was trying to use Google vision API v1 by Alloy Appcelerator

我创建一个请求 HTTPClient 并调用 API https://vision.googleapis.com/v1/images:annotate?key=MY_APP_KEY

I create a request HTTPClient and call API https://vision.googleapis.com/v1/images:annotate?key=MY_APP_KEY

但我收到了来自谷歌的回复文本:

But i have get response text from google :

  {
 error = {
     code = 400;
     details = (
                  {
                     "@type" = "type.googleapis.com/google.rpc.BadRequest";
                      fieldViolations = ({
                                        description = "Invalid JSON payload received. Unknown name \"request\": Cannot bind query parameter. Field 'request' could not be found in request message.";
                                        });
                  }
                );
     message = "Invalid JSON payload received. Unknown name \"request\": Cannot bind query parameter. Field 'request' could not be found in request message.";
     status = "INVALID_ARGUMENT";
  };

}

还有我的代码使用 Alloy 的 HTTP 请求

And there is my code use HTTP request by Alloy

var requests =  
{
  "requests":[
    {
      "image":{
        "content": "image_have_encodebase64",
      },
      "features":[
        {
          "type":"TEXT_DETECTION",
          "maxResults":1
        }
      ]
    }
  ]
};
var xhr = Titanium.Network.createHTTPClient();
xhr.open("POST", 'https://vision.googleapis.com/v1/images:annotate?key=MY_APP_KEY');
xhr.send(JSON.stringify(requests));

感谢您的帮助

推荐答案

通过设置 Content-Length 和 Content-Type 标题，它应该可以工作:

By setting the Content-Length and Content-Type headers it should work:

xhr.setRequestHeader("Content-Length", size);
xhr.setRequestHeader("Content-Type", "application/json");

另外应该注意的是，Google 建议将您的图片大小调整为 1024 x 768 -- 您可以使用以下方法调整您的图片大小:

Also it should be noted that Google recommends resizing your image to 1024 x 768 -- you can resize your image with:

img = img.imageAsResized(1024,768);

在对我的代码进行这些更改后，我一切正常.

After making these changes to my code I had everything working.

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