“expectedContentLength"返回值的单位是什么? [英] What is the unit of the value returned by "expectedContentLength"

问题描述

我正在尝试在进行连接时设置数据限制.我正在使用以下函数来获取 NSURLResponse 的大小.

I am trying to set a data limit when doing connections.I am using the following function to get the size of the NSURLResponse.

   NSURLResponse *response;
  long long size = [response expectedContentLength];

我得到的大小为:15219

是字节还是位?

推荐答案

expectedContentLength 在服务器提供时设置，例如通过 Content-Length 响应标头.

expectedContentLength is set when the server provides it, such as by a Content-Length response header.

Content-Length 是定义作者:

Content-Length entity-header 字段表示实体主体，以十进制数的 OCTET 发送给接收者，或者，在在 HEAD 方法的情况下，实体主体的大小如果请求是 GET，则已发送.

The Content-Length entity-header field indicates the size of the entity-body, in decimal number of OCTETs, sent to the recipient or, in the case of the HEAD method, the size of the entity-body that would have been sent had the request been a GET.

因此，您可以在大多数现代平台上假设字节为单位，其中一个字节的长度为 8 位.

So you can assume byte unit on most modern platform where a byte is 8 bits long.

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