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eb browser. The first version of the protocol had only one method, namely GET, which would request a page from a server.[3] The response from the server was always an HTML page.[4] ? The first documented version of HTTP was HTTP (1991). Dave Raggett led the HTTP Working Group (HTTP WG) in 1995 and wanted to expand the protocol extended operations, extended negotiation, richer metainformation, tied with a security protocol and got more efficient by adding additional methods and header fields.[5][6] RFC 1945 officially introduced and recognized HTTP in 1996. 樣例文本 C ? 互聯(lián)網(wǎng)協(xié)議提供的唯一幫助是, IPv4規(guī)定通過在路由節(jié)點計算校驗和來確保 IP數(shù)據(jù)報頭是正確的。這個帶來的副作用是當(dāng)場丟棄報頭錯誤的數(shù)據(jù)報。在這種情況下不需要發(fā)送通知給任一個終端節(jié)點, 但是互聯(lián)網(wǎng)控制消息協(xié)議( ICMP)中存在一個機制來做到這一點。 ? 但是, IPv6為了快速傳輸已經(jīng)放棄了計算校驗和的使用。 ? 對這些可靠性問題的更正是一個上層協(xié)議的責(zé)任。例如,一個上層協(xié)議為了確保按順序傳送可能要緩存數(shù)據(jù),直到數(shù)據(jù)可以傳遞給應(yīng)用程序。 ? 除了可靠性問題,互聯(lián)網(wǎng)及其組成部分的動態(tài)性和多樣性不能確保任何路徑是有能力地或合適地完成所要求的數(shù)據(jù)傳輸,即使路徑是有效并且可靠的。技術(shù)限制之一是在給定的鏈路上允許