HTTP协议对URI长度，POST数据长度及COOKIE长度的限制
HTTP协议对URI长度，POST数据长度及COOKIE长度的限制
1. URL长度限制
在Http1.1协议中并没有提出针对URL的长度进行限制，RFC协议里面是这样描述的，HTTP协议并不对URI的长度做任何的限制，服务器端必须能够处理任何它们所提供服务多能接受的URI，并且能够处理无限长度的URI,如果服务器不能处理过长的URI,那么应该返回414状态码。
虽然Http协议规定了，但是Web服务器和浏览器对URI都有自己的长度限制。
服务器的限制:我接触的最多的服务器类型就是Nginx和Tomcat,对于url的长度限制，它们都是通过控制http请求头的长度来进行限制的，nginx的配置参数为large_client_header_buffers，tomcat的请求配置参数为maxHttpHeaderSize,都是可以自己去进行设置。
浏览器的限制:每种浏览器也会对url的长度有所限制，下面是几种常见浏览器的url长度限制:(单位:字符)
IE : 2803
Firefox:65536
Chrome:8182
Safari:80000
Opera:190000
对于get请求，在url的长度限制范围之内，请求的参数个数没有限制。
2. Post数据的长度限制
Post数据的长度限制与url长度限制类似，也是在Http协议中没有规定长度限制,长度限制可以在服务器端配置最大http请求头长度的方式来实现。
3. Cookie的长度限制
Cookie的长度限制分这么几个方面来总结。
(1) 浏览器所允许的每个域下的最大cookie数目,没有去自己测试，从网上找到的资料大概是这么个情况
IE :原先为20个，后来升级为50个
Firefox: 50个
Opera:30个
Chrome:180个
Safari:无限制
当Cookie数超过限制数时浏览器的行为：IE和Opera会采用LRU算法将老的不常使用的Cookie清除掉，Firefox的行为是随机踢出某些Cookie的值。当然无论怎样的策略，还是尽量不要让Cookie数目超过浏览器所允许的范围。
(2) 浏览器所允许的每个Cookie的最大长度
Firefox和Safari:4079字节
Opera:4096字节
IE:4095字节
(3) 服务器中Http请求头长度的限制。Cookie会被附在每次http请求头中传递给服务器，因此还会受到服务器请求头长度的影响。
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