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任务是将视频分段上传到服务器。我见过很多类似的问题，但是我需要手动发送具有指定字节范围的数据包才能停止和继续。我似乎错误地创建了标题和正文。

现在请求看起来像这样：

POST http://ovu.mycdn.me/upload.do?sig=... HTTP/1.1
Content-Range: bytes 196608-262144/4549847
Content-Type: multipart/mixed; boundary=66614565-7d65-44a3-a78e-49f6f9ee6d53
Content-Length: 65749
Host: ovu.mycdn.me
Connection: Keep-Alive
Accept-Encoding: gzip
User-Agent: okhttp/4.5.0

--666...f9ee6d53
Content-Disposition: form-data; name="video_file"; filename="video"
Content-Type: multipart/form-data
Content-Length: 65536
                                     
--666...f9ee6d53--

以及创建一个请求的代码。成功时，发送下一个范围。

RequestBody requestBody = new RequestBody() {
    @Override
    public MediaType contentType() {
        return MediaType.parse("multipart/form-data");
    }

    @Override
    public long contentLength() {
        return finalBytesRead;
    }

    @Override
    public void writeTo(@NotNull BufferedSink sink) throws IOException {
        sink.write(buffer, 0, finalBytesRead); // write 64kb from file
    }
};

RequestBody requestBody1 = new MultipartBody.Builder()
    .addFormDataPart("video_file", "video", requestBody)
    .build();

Request request = new Request.Builder()
    .addHeader("Content-Range", "bytes " + currentLength + "-" + (currentLength + bytesRead) + '/' + size)
    .addHeader("Accept-Ranges", "bytes")
    .url(url)
    .post(requestBody1)
    .build();

call = client.newCall(request);
call.enqueue(new Callback() { 
....

服务器可以以秒为单位查看视频大小，但视频无法打开。

视频应位于 video_file 字段中，格式为multipart/form-data

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