kinvey 休息 api 上传

Question

我正在尝试使用 REST API 方法在 Kinvey 上上传。

向https://baas.kinvey.com/blob/:myAppId

发送'POST'请求后，我可以成功获取google存储URLlink

问题是当我向 google 存储 URL 发送 'PUT' 请求时，出现此错误：

XMLHttpRequest cannot load (my storage.google URL). Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin (my localhost) is therefore not allowed access.

Answer 1

这似乎是一个相当标准的 CORS 错误（您可以在此处阅读更多相关信息：https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS ) , which takes place when you are making a cross-origin request. There's a lot of different ways that you can approach this issue, but the easiest would probably be to use one of our SDK's to help you. If you take a look over at http://devcenter.kinvey.com/html5/downloads您会找到一个 SDK，您可以将其包含在您的项目中，并在其中找到它的指南/文档顶部导航。

使用 HTML5 库上传文件也相当简单。这是我编写的一些示例代码：

HTML部分：

<input type="file" name="_file" id="_file" onchange="fileSelected();" />
        <div id="fileinfo">
            <div id="filename"></div>
            <div id="filetype"></div>
        </div>

Javascript部分：

function fileSelected(){
    var oFile = document.getElementById('_file').files[0];
    var oReader = new FileReader();
    oReader.onload = function(e) {
        document.getElementById('fileinfo').style.display = 'block';
        document.getElementById('filename').innerHTML = 'Name: ' + oFile.name;
        document.getElementById('filetype').innerHTML = 'Type: ' + oFile.type;
    };
    oReader.readAsDataURL(oFile);
    fileUpload(oFile);
}


function fileUpload(file) {
    var file = document.getElementById('_file').files[0];
    var promise = Kinvey.File.upload(file,{
        filename: document.getElementById('fileinfo').toString(),
        mimetype: document.getElementById('filetype').toString()
    })
    promise.then(function() {
        alert("File Uploaded Successfully");
    }, function(error){
        alert("File Upload Failure:  " +  error.description);
    });
}

Kinvey 的每个 Javascript 库都会略有不同，但应该遵循大致相同的大纲。获取文件，异步调用 Kinvey.File.Upload，让 SDK 发挥它的魔力。这应该可以为您解决 CORS 的所有问题。

谢谢，

kinvey 休息 api 上传

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