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	   Copyright 2020 t-io
	
	   Licensed under the Apache License, Version 2.0 (the "License");
	   you may not use this file except in compliance with the License.
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*/
package org.tio.http.common;

/**
 *
 * @author tanyaowu
 *
 */
public interface HttpConst {

	public interface HttpVersion {
		String	V1_1	= "1.1";
		String	V1_0	= "1.0";
	}

	/**
	 * 请求体的格式
	 * @author tanyaowu
	 * 2017年6月28日 上午10:03:12
	 */
	public enum RequestBodyFormat {
		URLENCODED, MULTIPART, TEXT
	}

	/**
	 *         Accept-Language : zh-CN,zh;q=0.8
	     Sec-WebSocket-Version : 13
	  Sec-WebSocket-Extensions : permessage-deflate; client_max_window_bits
	                   Upgrade : websocket
	                      Host : t-io.org:9321
	           Accept-Encoding : gzip, deflate, sdch
	                User-Agent : Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
	                    Origin : http://www.t-io.org:9292
	         Sec-WebSocket-Key : kmCL2C7q9vtNSMyHpft7lw==
	                Connection : Upgrade
	             Cache-Control : no-cache
	                    Pragma : no-cache
	 *
	 * @author tanyaowu
	 * 2017年5月27日 下午2:11:57
	 */
	public interface RequestHeaderKey {
		String	Cookie						= "cookie";						//.toLowerCase();//Cookie: $Version=1; Skin=new;
		String	Origin						= "origin";						//.toLowerCase(); //http://127.0.0.1
		String	Sec_WebSocket_Key			= "sec-websocket-key";			//.toLowerCase(); //2GFwqJ1Z37glm62YKKLUeA==
		String	Cache_Control				= "cache-control";				//.toLowerCase(); //"public, max-age:86400"
		String	Connection					= "connection";					//.toLowerCase(); //Upgrade,  keep-alive
		String	User_Agent					= "user-agent";					//.toLowerCase(); //Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3088.3 Safari/537.36
		String	Sec_WebSocket_Version		= "sec-websocket-version";		//.toLowerCase(); //13
		String	Host						= "host";						//.toLowerCase(); //127.0.0.1:9321
		String	Pragma						= "pragma";						//.toLowerCase(); //no-cache
		String	Accept_Encoding				= "accept-encoding";			//.toLowerCase(); //gzip, deflate, br
		String	Accept_Language				= "accept-language";			//.toLowerCase(); //zh-CN,zh;q=0.8,en;q=0.6
		String	Upgrade						= "upgrade";					//.toLowerCase(); //websocket
		String	Sec_WebSocket_Extensions	= "sec-websocket-extensions";	//.toLowerCase(); //permessage-deflate; client_max_window_bits
		String	Content_Length				= "content-length";				//.toLowerCase(); //65
		String	Content_Type				= "content-type";				//.toLowerCase();// : 【application/x-www-form-urlencoded】【application/x-www-form-urlencoded; charset=UTF-8】【multipart/form-data; boundary=----WebKitFormBoundaryuwYcfA2AIgxqIxA0 】
		String	If_Modified_Since			= "if-modified-since";			//.toLowerCase(); //与Last-Modified配合

		String Referer = "referer";

		/**
		 * 值为XMLHttpRequest则为Ajax
		 */
		String X_Requested_With = "x-requested-with";//.toLowerCase();//XMLHttpRequest
	}

	//	Content-Type: text/html;charset:utf-8;

	/**
	 *
	 * @author tanyaowu
	 * 2017年6月27日 下午8:23:58
	 */
	public interface RequestHeaderValue {
		public interface Connection {
			String	keep_alive	= "keep-alive";	//.toLowerCase();
			String	Upgrade		= "upgrade";	//.toLowerCase();
			String	close		= "close";		//.toLowerCase();
		}

		//application/x-www-form-urlencoded、multipart/form-data、text/plain
		public interface Content_Type {
			/**
			 * 普通文本，一般会是json或是xml
			 */
			String	text_plain							= "text/plain";
			/**
			 * 文件上传
			 */
			String	multipart_form_data					= "multipart/form-data";
			/**
			 * 普通的key-value
			 */
			String	application_x_www_form_urlencoded	= "application/x-www-form-urlencoded";
		}
	}

	public interface ResponseHeaderKey {
		//Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1
		String	Set_Cookie							= "Set-Cookie".toLowerCase();						//Set-Cookie: UserID=JohnDoe; Max-Age=3600; Version=1
		String	Content_Length						= "Content-Length".toLowerCase();					//65
		String	Cache_Control						= "Cache-Control".toLowerCase();					//"public, max-age:86400"
		String	Connection							= "Connection".toLowerCase();						//Upgrade,  keep-alive
		String	Keep_Alive							= "Keep-Alive".toLowerCase();						//Keep-Alive:timeout=20
		String	Sec_WebSocket_Accept				= "Sec-WebSocket-Accept".toLowerCase();
		String	Upgrade								= "Upgrade".toLowerCase();
		String	Access_Control_Allow_Credentials	= "Access-Control-Allow-Credentials".toLowerCase();

		/**
		 * Content-Disposition: attachment;filename=FileName.txt
		 * 文件下载
		 */
		String	Content_Disposition	= "Content-Disposition".toLowerCase();
		/**
		 * 文档的编码（Encode）方法。只有在解码之后才可以得到Content-Type头指定的内容类型。
		 * 利用gzip压缩文档能够显著地减少HTML文档的下载时间。
		 * Java的GZIPOutputStream可以很方便地进行gzip压缩，但只有Unix上的Netscape和Windows上的IE 4、IE 5才支持它。
		 * 因此，Servlet应该通过查看Accept-Encoding头（即request.getHeader("Accept-Encoding")）检查浏览器是否支持gzip，
		 * 为支持gzip的浏览器返回经gzip压缩的HTML页面，为其他浏览器返回普通页面。
		 */
		String	Content_Encoding	= "Content-Encoding".toLowerCase();
		/**
		 * 表示后面的文档属于什么MIME类型。Servlet默认为text/plain，但通常需要显式地指定为text/html。
		 * 由于经常要设置Content-Type，因此HttpServletResponse提供了一个专用的方法setContentType。
		 */
		String	Content_Type		= "Content-Type".toLowerCase();
		/**
		 * 当前的GMT时间。你可以用setDateHeader来设置这个头以避免转换时间格式的麻烦。
		 */
		String	Date				= "Date".toLowerCase();
		/**
		 * 应该在什么时候认为文档已经过期，从而不再缓存它？
		 */
		String	Expires				= "Expires".toLowerCase();
		/**
		 * 文档的最后改动时间。客户可以通过If-Modified-Since请求头提供一个日期，该请求将被视为一个条件GET，
		 * 只有改动时间迟于指定时间的文档才会返回，否则返回一个304（Not Modified）状态。Last-Modified也可用setDateHeader方法来设置。
		 */
		String	Last_Modified		= "Last-Modified".toLowerCase();
		/**
		 * 表示客户应当到哪里去提取文档。Location通常不是直接设置的，而是通过HttpServletResponse的sendRedirect方法，该方法同时设置状态代码为302。
		 */
		String	Location			= "Location".toLowerCase();
		/**
		 * 表示浏览器应该在多少时间之后刷新文档，以秒计。除了刷新当前文档之外，你还可以通过setHeader("Refresh", "5; URL=http://host/path")让浏览器读取指定的页面。
		注意这种功能通常是通过设置HTML页面HEAD区的＜META HTTP-EQUIV="Refresh" CONTENT="5;URL=http://host/path"＞实现，这是因为，自动刷新或重定向对于那些不能使用CGI或Servlet的HTML编写者十分重要。但是，对于Servlet来说，直接设置Refresh头更加方便。
		
		注意Refresh的意义是"N秒之后刷新本页面或访问指定页面"，而不是"每隔N秒刷新本页面或访问指定页面"。因此，连续刷新要求每次都发送一个Refresh头，而发送204状态代码则可以阻止浏览器继续刷新，不管是使用Refresh头还是＜META HTTP-EQUIV="Refresh" ...＞。
		
		注意Refresh头不属于HTTP 1.1正式规范的一部分，而是一个扩展，但Netscape和IE都支持它。
		 */
		String	Refresh				= "Refresh".toLowerCase();
		/**
		 * 服务器名字。Servlet一般不设置这个值，而是由Web服务器自己设置。
		 */
		String	Server				= "Server".toLowerCase();

		/**
		 *
		 */
		String Access_Control_Allow_Origin = "Access-Control-Allow-Origin".toLowerCase(); //value: *

		String Access_Control_Allow_Methods = "Access-Control-Allow-Methods".toLowerCase();

		String	Access_Control_Max_Age			= "Access-Control-Max-Age".toLowerCase();
		/**
		 *
		 */
		String	Access_Control_Allow_Headers	= "Access-Control-Allow-Headers".toLowerCase();	//.toLowerCase(); //value: x-requested-with,content-type

		/**
		 * 是否是从缓存中获取的数据，tio-httpserver特有的头部信息
		 */
		String tio_from_cache = "tio-from-cache";

		/**
		 * 
		 */
		String tio_webpack_used_cache = "tio-webpack-used-cache";

	}

	/**
	 *
	 * @author tanyaowu
	 * 2017年6月27日 下午8:24:02
	 */
	public interface ResponseHeaderValue {
		public interface Connection {
			String	keep_alive	= "keep-alive";	//.toLowerCase();
			String	Upgrade		= "Upgrade";	//.toLowerCase();
			String	close		= "close";		//.toLowerCase();
		}

		public interface Upgrade {
			String WebSocket = "WebSocket";
		}
	}

	/**
	 *
	 */
	String SERVER_INFO = "t-io";

	/**
	 * 默认规定连接到本服务器的客户端统一用utf-8
	 */
	String CHARSET_NAME = "utf-8";
}
