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restful之http的详细介绍

零下一度

零下一度

发布时间:2017-07-24 14:20:27

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来源于php中文网

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        HTTP(HyperText Transfer Protocol)是一套计算机通过网络进行通信的规则。计算机专家设计出HTTP,使HTTP客户(如Web浏览器)能够从HTTP服务器(Web服务器)请求信息和服务,HTTP目前协议的版本是1.1.HTTP是一种无状态的协议,无状态是指Web浏览器和Web服务器之间不需要建立持久的连接,这意味着当一个客户端向服务器端发出请求,然后Web服务器返回响应(response),连接就被关闭了,在服务器端不保留连接的有关信息.HTTP遵循请求(Request)/应答(Response)模型。Web浏览器向Web服务器发送请求,Web服务器处理请求并返回适当的应答。所有HTTP连接都被构造成一套请求和应答。
HTTP使用内容类型,是指Web服务器向Web浏览器返回的文件都有与之相关的类型。所有这些类型在MIME Internet邮件协议上模型化,即Web服务器告诉Web浏览器该文件所具有的种类,是HTML文档、GIF格式图像、声音文件还是独立的应用程序。大多数Web浏览器都拥有一系列的可配置的辅助应用程序,它们告诉浏览器应该如何处理Web服务器发送过来的各种内容类型。
HTTP通信机制是在一次完整的HTTP通信过程中,Web浏览器与Web服务器之间将完成下列7个步骤:
(1)    建立TCP连接
在HTTP工作开始之前,Web浏览器首先要通过网络与Web服务器建立连接,该连接是通过TCP来完成的,该协议与IP协议共同构建Internet,即著名的TCP/IP协议族,因此Internet又被称作是TCP/IP网络。HTTP是比TCP更高层次的应用层协议,根据规则,只有低层协议建立之后才能,才能进行更层协议的连接,因此,首先要建立TCP连接,一般TCP连接的端口号是80
(2)    Web浏览器向Web服务器发送请求命令
一旦建立了TCP连接,Web浏览器就会向Web服务器发送请求命令
例如:GET/sample/hello.jsp HTTP/1.1
(3)    Web浏览器发送请求头信息
浏览器发送其请求命令之后,还要以头信息的形式向Web服务器发送一些别的信息,之后浏览器发送了一空白行来通知服务器,它已经结束了该头信息的发送。
(4)    Web服务器应答
客户机向服务器发出请求后,服务器会客户机回送应答,
HTTP/1.1 200 OK
应答的第一部分是协议的版本号和应答状态码
(5)    Web服务器发送应答头信息
正如客户端会随同请求发送关于自身的信息一样,服务器也会随同应答向用户发送关于它自己的数据及被请求的文档。
(6)    Web服务器向浏览器发送数据
Web服务器向浏览器发送头信息后,它会发送一个空白行来表示头信息的发送到此为结束,接着,它就以Content-Type应答头信息所描述的格式发送用户所请求的实际数据
(7)    Web服务器关闭TCP连接
一般情况下,一旦Web服务器向浏览器发送了请求数据,它就要关闭TCP连接,然后如果浏览器或者服务器在其头信息加入了这行代码
Connection:keep-alive
TCP连接在发送后将仍然保持打开状态,于是,浏览器可以继续通过相同的连接发送请求。保持连接节省了为每个请求建立新连接所需的时间,还节约了网络带宽。
    
HTTP请求格式
当浏览器向Web服务器发出请求时,它向服务器传递了一个数据块,也就是请求信息,HTTP请求信息由3部分组成:
l   请求方法URI协议/版本
l   请求头(Request Header)
l   请求正文
下面是一个HTTP请求的例子:
GET/sample.jspHTTP/1.1
Accept:image/gif.image/jpeg,*/*
Accept-Language:zh-cn
Connection:Keep-Alive
Host:localhost
User-Agent:Mozila/4.0(compatible;MSIE5.01;Window NT5.0)
Accept-Encoding:gzip,deflate
 
username=jinqiao&password=1234
 
(1)       请求方法URI协议/版本
请求的第一行是“方法URL议/版本”:GET/sample.jsp HTTP/1.1
以上代码中“GET”代表请求方法,“/sample.jsp”表示URI,“HTTP/1.1代表协议和协议的版本。
根据HTTP标准,HTTP请求可以使用多种请求方法。例如:HTTP1.1支持7种请求方法:GET、POST、HEAD、OPTIONS、PUT、DELETE和TARCE。在Internet应用中,最常用的方法是GET和POST。
URL完整地指定了要访问的网络资源,通常只要给出相对于服务器的根目录的相对目录即可,因此总是以“/”开头,最后,协议版本声明了通信过程中使用HTTP的版本。
(2) 请求头(Request Header)
请求头包含许多有关的客户端环境和请求正文的有用信息。例如,请求头可以声明浏览器所用的语言,请求正文的长度等。
Accept:image/gif.image/jpeg.*/*
Accept-Language:zh-cn
Connection:Keep-Alive
Host:localhost
User-Agent:Mozila/4.0(compatible:MSIE5.01:Windows NT5.0)
Accept-Encoding:gzip,deflate.
(3) 请求正文
请求头和请求正文之间是一个空行,这个行非常重要,它表示请求头已经结束,接下来的是请求正文。请求正文中可以包含客户提交的查询字符串信息:
username=jinqiao&password=1234
在以上的例子的HTTP请求中,请求的正文只有一行内容。当然,在实际应用中,HTTP请求正文可以包含更多的内容。
HTTP请求方法我这里只讨论GET方法与POST方法
l         GET方法
GET方法是默认的HTTP请求方法,我们日常用GET方法来提交表单数据,然而用GET方法提交的表单数据只经过了简单的编码,同时它将作为URL的一部分向Web服务器发送,因此,如果使用GET方法来提交表单数据就存在着安全隐患上。例如
Http://127.0.0.1/login.jsp?Name=zhangshi&Age=30&Submit=%cc%E+%BD%BB
从上面的URL请求中,很容易就可以辩认出表单提交的内容。(?之后的内容)另外由于GET方法提交的数据是作为URL请求的一部分所以提交的数据量不能太大
l         POST方法
POST方法是GET方法的一个替代方法,它主要是向Web服务器提交表单数据,尤其是大批量的数据。POST方法克服了GET方法的一些缺点。通过POST方法提交表单数据时,数据不是作为URL请求的一部分而是作为标准数据传送给Web服务器,这就克服了GET方法中的信息无法保密和数据量太小的缺点。因此,出于安全的考虑以及对用户隐私的尊重,通常表单提交时采用POST方法。
  从编程的角度来讲,如果用户通过GET方法提交数据,则数据存放在QUERY_STRING环境变量中,而POST方法提交的数据则可以从标准输入流中获取。
HTTP应答与HTTP请求相似,HTTP响应也由3个部分构成,分别是:
l 协议状态版本代码描述
l 响应头(Response Header)
l 响应正文
下面是一个HTTP响应的例子:
HTTP/1.1 200 OK
Server:Apache Tomcat/5.0.12
Date:Mon,6Oct2003 13:23:42 GMT
Content-Length:112
 

HTTP响应示例<title>
</head>
<body>
Hello HTTP!
</body>
</html>协议状态代码描述HTTP响应的第一行类似于HTTP请求的第一行,它表示通信所用的协议是HTTP1.1服务器已经成功的处理了客户端发出的请求(200表示成功):
HTTP/1.1 200 OK响应头(Response Header)响应头也和请求头一样包含许多有用的信息,例如服务器类型、日期时间、内容类型和长度等:
   Server:Apache Tomcat/5.0.12
Date:Mon,6Oct2003 13:13:33 GMT
Content-Type:text/html
Last-Moified:Mon,6 Oct 2003 13:23:42 GMT
Content-Length:112
 响应正文响应正文就是服务器返回的HTML页面:
  <html><head>
<title>HTTP响应示例<title>
</head>
<body>
Hello HTTP!
</body>
</html></pre></div>
<div>响应头和正文之间也必须用空行分隔。  </div>
<div>l        HTTP应答码</div>
<div>   HTTP应答码也称为状态码,它反映了Web服务器处理HTTP请求状态。HTTP应答码由3位数字构成,其中首位数字定义了应答码的类型:</div>
<div>   1XX-信息类(Information),表示收到Web浏览器请求,正在进一步的处理中</div>
<div>   2XX-成功类(Successful),表示用户请求被正确接收,理解和处理例如:200 OK</div>
<div>      3XX-重定向类(Redirection),表示请求没有成功,客户必须采取进一步的动作。</div>
<div>      4XX-客户端错误(Client Error),表示客户端提交的请求有错误 例如:404 NOT</div>
<div>                                    Found,意味着请求中所引用的文档不存在。</div>
<div>      5XX-服务器错误(Server Error)表示服务器不能完成对请求的处理:如 500</div>
<div>      对于我们Web开发人员来说掌握HTTP应答码有助于提高Web应用程序调试的效率和准确性。</div>
<div> </div>
<div>安全连接</div>
<div>Web应用最常见的用途之一是电子商务,可以利用Web服务器端程序使人们能够网络购物,需要指出一点是,缺省情况下,通过Internet发送信息是不安全的,如果某人碰巧截获了你发给朋友的一则消息,他就能打开它,假想在里面有你的信用卡号码,这会有多么糟糕,幸运的是,很多Web服务器以及Web浏览器都有创立安全连接的能力,这样它们就可以安全的通信了。</div>
<div>通过Internet提供安全连接最常见的标准是安全套接层(Secure Sockets layer,SSl)协议。SSL协议是一个应用层协议(和HTTP一样),用于安全方式在Web上交换数据,SSL使用公开密钥编码系统。从本质讲,这意味着业务中每一方都拥有一个公开的和一个私有的密钥。当一方使用另一方公开密钥进行编码时,只有拥有匹配密钥的人才能对其解码。简单来讲,公开密钥编码提供了一种用于在两方之间交换数据的安全方法,SSL连接建立之后,客户和服务器都交换公开密钥,并在进行业务联系之前进行验证,一旦双方的密钥都通过验证,就可以安全地交换数据。</div>
</div>
<div><ul class=" list-paddingleft-2">
<li><p>get<br>通过<strong>请求</strong>uri得到资源</p></li>
<li><p>POST,<br>用于添加新的内容</p></li>
<li><p>PUT<br>用于修改某个内容</p></li>
<li><p>DELETE,<br>删除某个内容</p></li>
<li><p>CONNECT,<br>用于代理进行传输,如使用SSL</p></li>
<li><p>OPTIONS<br>询问可以执行哪些<strong>方法</strong></p></li>
<li><p>PATCH,<br>部分文档更改</p></li>
<li><p>PROPFIND, (wedav)<br>查看属性</p></li>
<li><p>PROPPATCH, (wedav)<br>设置属性</p><div class="aritcle_card flexRow">
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							</div>
						</div></li>
<li><p>MKCOL, (wedav)<br>创建集合(文件夹)</p></li>
<li><p>COPY, (wedav)<br>拷贝</p></li>
<li><p>MOVE, (wedav)<br>移动</p></li>
<li><p>LOCK, (wedav)<br>加锁</p></li>
<li><p>UNLOCK (wedav)<br>解锁</p></li>
<li><p>TRACE<br>用于远程诊断服务器</p></li>
<li><p>HEAD<br>类似于GET, 但是不返回body信息,用于检查对象是否存在,以及得到对象的元数据</p></li>
</ul></div>					</div>
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