Content-Encoding与Content-Type的区别
RFC 2616 for HTTP 1.1 specifies how web servers must indicate encoding transformations using the Content-Encoding header. Although on the surface, Content-Encoding (e.g., gzip, deflate, compress) and Content-Type(e.g., x-application/x-gzip) sound similar, they are, in fact, two distinct pieces of information. Whereas servers use Content-Type to specify the data type of the entity body, which can be useful for client applications that want to open the content with the appropriate application, Content-Encoding is used solely to specify any additional encoding done by the server before the content was transmitted to the client. Although the HTTP RFC outlines these rules pretty clearly, some web sites respond with "gzip" as the Content-Encoding even though the server has not gzipped the content.
Our testing has shown this problem to be limited to some sites that serve Unix/Linux style "tarball" files. Tarballs are gzip compressed archives files. By setting the Content-Encoding header to "gzip" on a tarball, the server is specifying that it has additionally gzipped the gzipped file. This, of course, is unlikely but not impossible or non-compliant.
Therein lies the problem. A server responding with content-encoding, such as "gzip," is specifying the necessary mechanism that the client needs in order to decompress the content. If the server did not actually encode the content as specified, then the client's decompression would fail.
-----------------------------------来自RFC2616--------------------------------------
When an entity-body is included with a message, the data type of that
body is determined via the header fields Content-Type and Content-
Encoding. These define a two-layer, ordered encoding model: entity-body := Content-Encoding( Content-Type( data ) ) Content-Type specifies the media type of the underlying data.
Content-Encoding may be used to indicate any additional content
codings applied to the data, usually for the purpose of data
compression, that are a property of the requested resource. There is
no default encoding. Any HTTP/1.1 message containing an entity-body SHOULD include a
Content-Type header field defining the media type of that body. If
and only if the media type is not given by a Content-Type field, the
recipient MAY attempt to guess the media type via inspection of its
content and/or the name extension(s) of the URI used to identify the
resource. If the media type remains unknown, the recipient SHOULD
treat it as type "application/octet-stream".
Content-Encoding与Content-Type的区别的更多相关文章
- Content encoding error问题解决方法
A few people have been experiencing the following error. UPDATE: The reason for it happening is beca ...
- Jmeter学习——http请求Content encoding的重要性
今天在测试一个接口的时候,遇到的问题,困扰了我一天 下面是一个接口,使用的是post请求,Content-Type为application/json 返回参数如下: 瞬间懵逼了!!!为什么呢?渠道是存 ...
- Content Provider Basics ——Content Provider基础
A content provider manages access to a central repository of data. A provider is part of an Android ...
- Django 报错 Reverse for 'content' not found. 'content' is not a valid view function or pattern name.
Django 报错 Reverse for 'content' not found. 'content' is not a valid view function or pattern name. 我 ...
- 转:AutoLayout中的Content Hugging 和 Content Compression Resistance
OS6中引入了AutoLayout,极大的方便了UI元素的布局,现在已经过去一年了,并且大部分设备的系统也已经升级到了iOS6,是时候要使用此项技术了. 在AutoLayout的学习中有两个概念官方文 ...
- one-hot encoding与哑变量的区别
one-hot encoding与哑变量的区别 one-hot比哑变量的特征位多一位,即哑变量是精简版的one-hot,即在线性回归中用截距项来表示最后一维,但由于最初很难分辨特征的主次关系,且机器学 ...
- ASP.NET控件<ASP:Button /> html控件<input type="button">区别联系
ASP.NET控件<ASP:Button />-------html控件<input type="button">杨中科是这么说的:asp和input是一样 ...
- Html中,id、name、class、type的区别
<input type="text" name="name" id="name" class="txt"> ...
- isinstance与type的区别
1.isinstance()内置函数 python中的isinstance()函数是python的内置函数,用来判断一个函数是否是一个已知类型.类似type. 2.用法: isinstance(obj ...
- iOS开发 - Content hugging priority & Content compression resistance priority
1. 什么是Content hugging priority 你可以把它想象成一根放在视图上的橡皮筋. 这根橡皮筋会组织视图超过它本身的固有大小(intrinsic content size). 它存 ...
随机推荐
- SSM(spring mvc+spring+mybatis)学习路径——2-1、spring MVC入门
目录 2-1 Spring MVC起步 一.回顾Servlet 二.SpringMVC简介 三.搭建SpringMVC第一个案例 四.简单流程及配置 五.使用注解开发Controller 六.参数绑定 ...
- Spring MVC 注解基础
@Controller @Controller 注解用于标记在 Java 类上.被 @Controller 标记过的类就是一个 SpringMVC Controller对象.DispatcherSer ...
- mongodb之用户/认证/角色/权限管理
前言 用户权限管理很重要,只给需要的权限,防止应用系统漏洞导致脱库 认证和授权 Authentication 认证识别,解决我是谁 Authorization 操作授权,我能做什么 认证机制 MONG ...
- Graphics简单汇总
1.主页面布局文件 activity_main.xml(仅仅有2个button按钮) <?xml version="1.0" encoding="utf-8&quo ...
- jQuery EasyUI 1.4更新记录
问题: menu:修复当删除一个menu项时.menu高度不准确. datagrid:修复当datagrid宽度太小时,fitColumns方法不能使用. 改进: 1.为easyui全部组件新增了自适 ...
- Zend_Form 创建、校验和解析表单的基础--(手冊)
1. 创建表单对象 创建表单对象很easy:仅仅要实现 Zend_Form: <?php $form = newZend_Form; ? > 对于高级用例.须要创建 Zend_Form ...
- jabberNet 修改花名册条目的昵称
修改昵称,这么简单的功能,在jabberNet里怎么实现? 翻遍了jabberNet里的代码,jabber.client.RosterManager也,JabberClient也,似乎都没有现成的方法 ...
- WCF学习笔记——配置服务引用
WCF传过来的东西要序列化. 比如,在WCF服务中,象这么个方法 public IEnumerable<UserItem> GetUserList() 默认情况下,在客户端会调用,是这样: ...
- 687C
dp 以前做过 忘了. 想破脑袋不知道怎么设状态 dp[i][j][k]表示选到第i个硬币,当前和为j,能否弄出k dp[i][j][k]|=dp[i-1][j][k]|dp[i-1][j][k-c[ ...
- php循环跳出
PHP中的循环结构大致有for循环,while循环,do{} while 循环以及foreach循环几种,不管哪种循环中,在PHP中跳出循环大致有这么几种方式: 代码: <?php $i = 1 ...