在驱动器请求集HTTP头 [英] Set HTTP header in Drive request

问题描述

我要更新文件，驱动器时检测到冲突。要做到这一点，看来我必须设置如果-匹配头

I want to detect conflict when updating a file to Drive. To accomplish this, it seems I have to set the If-Match header.

目前，我与这一个班轮更新文档到谷歌驱动器：

Currently, I update the doc to Google Drive with this one-liner:

mDriveFile = mService.files().update(mDriveFile.getId(), mDriveFile, byteContent).execute();

什么是添加如果-匹配头在请求中最简单的方法？ 实例文件：更新文档没有告诉如何设置HTTP标头。

What is the simplest way to add the If-Match header in the request? Example in Files: update documentation does not tell how to set HTTP headers.

推荐答案

您可以从更新获得标题对象，添加自己，并把他们带回执行HTTP前要求：

You can get the headers from Update object, add your own and put them back before executing the HTTP request:

final Update update = mService.files().update(mDriveFile.getId(), mDriveFile, byteContent);
final HttpHeaders headers = update.getRequestHeaders();
headers.setIfMatch("TheETagStoredFromDownload");
update.setRequestHeaders(headers);
mDriveFile = update.execute();

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