DropBox API application/octet-stream header

Question

我正在尝试使用 PHP 向 Dropbox API 发出 cUrl 请求，以便开始上传一个非常大的 zip 文件。这是我正在尝试实现的文档，位于 https://www.dropbox.com/developers/documentation/http/documentation#files-upload -

URL结构：https://content.dropboxapi.com/2/files/upload_session/start

示例 cUrl 请求：

curl -X POST https://content.dropboxapi.com/2/files/upload_session/start \
    --header "Authorization: Bearer <get access token>" \
    --header "Dropbox-API-Arg: {\"close\": false}" \
    --header "Content-Type: application/octet-stream" \
    --data-binary @local_file.txt

这是我的代码：

$uploads = wp_upload_dir();
$file = $uploads['basedir']."/maintainme/backups/files/backup_".$filename.'/'.$filename.'.zip';
$ch = curl_init();
$url = 'https://content.dropboxapi.com/2/files/upload_session/start';
$headers = array(
    'Authorization: Bearer ' .$dropbox_token,
    'Dropbox-API-Arg: {\"close\": false}',
    'Content-Type: application/octet-stream',
);
$fields = array('file' => '@' . $file);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_POSTFIELDS, $fields ); 
curl_setopt($ch, CURLOPT_VERBOSE, 1);
$result = curl_exec($ch);
curl_close($ch);

我收到的错误信息是：

调用 API 函数时出错 "files/upload_session/start"：HTTP 错误 "Content-Type" header："application/octet-stream; boundary=------------------------1ee7d00b0e9b0c47"。期待 "application/octet-stream"、"text/plain; charset=dropbox-cors-hack".

之一

似乎每次我尝试发出此请求时，此 'Boundary=------------blahblahblah' 都会附加到我的 content-type header。有人有主意吗？？？谢谢！

Answer 1

解决了！一时兴起，我检查了 http://php.net/manual/en/function.curl-setopt.php 中的 'CURLOPT_POSTFIELDS' 选项，它是这样说的：

The full data to post in a HTTP "POST" operation. To post a file, prepend a filename with @ and use the full path. The filetype can be explicitly specified by following the filename with the type in the format ';type=mimetype'. This parameter can either be passed as a urlencoded string like 'para1=val1&para2=val2&...' or as an array with the field name as key and field data as value. If value is an array, the Content-Type header will be set to multipart/form-data. As of PHP 5.2.0, value must be an array if files are passed to this option with the @ prefix. As of PHP 5.5.0, the @ prefix is deprecated and files can be sent using CURLFile. The @ prefix can be disabled for safe passing of values beginning with @ by setting the CURLOPT_SAFE_UPLOAD option to TRUE.

以上段落中的相关部分已加粗。显然将数组传递给 CURLOPT_POSTFIELDS 选项是附加 'Boundary=----blahblahblah' Content-Type 并导致 API 调用失败的原因。我改变了

curl_setopt($ch, CURLOPT_POSTFIELDS, $fields );

至

curl_setopt($ch, CURLOPT_POSTFIELDS, '@'.$file );

并再次尝试。最初的问题已解决，但随后我在这部分代码中的 'Dropbox-API-Arg' 行遇到了一个新问题：

$headers = array(
    'Authorization: Bearer ' .$dropbox_token,
    'Dropbox-API-Arg: {\"close\": false}',
    'Content-Type: application/octet-stream',
);

事实证明，这些参数需要被正确地 JSON 编码。我用下面的代码做到了这一点：

$args = array('close'=>false);
$args = json_encode($args);

然后改成

'Dropbox-API-Arg: {\"close\": false}'

至：

'Dropbox-API-Arg:'.$args

这是完整的最终代码：

    $uploads = wp_upload_dir();
    $file = $uploads['basedir']."/maintainme/backups/files/backup_".$filename.'/'.$filename.'.zip';
    error_log($file);

    $args = array('close'=>false);
    $args = json_encode($args);

    $ch = curl_init();
    $url = 'https://content.dropboxapi.com/2/files/upload_session/start';
    $headers = array(
        'Authorization: Bearer ' .$dropbox_token,
        'Dropbox-API-Arg:'.$args,
        'Content-Type: application/octet-stream',
    );
    $fields = array('file' => '@' . $file);
    error_log($fields);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_POSTFIELDS, '@'.$file ); 
    curl_setopt($ch, CURLOPT_VERBOSE, 1);
    $result = curl_exec($ch);
    error_log($result);
    curl_close($ch);

DropBox API application/octet-stream header

DropBox API application/octet-stream header

php

curl

content-type

dropbox

http-headers