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HTTP协议讲解及手工模拟HTTP请求

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<style type="text/css">

ul,li{

margin:0;

padding:0;

float:left;

display:block;

    list-style-type: none;

}

.bi{

position: relative;

z-index: 0;

}

.bi:hover{z-index: 99;}

.bi:hover span{

visibility: visible;

top: 0;

left: 0;

}

.bi span{

position: absolute;

visibility: hidden;

}

#nav li a,.bi:hover span{

line-height: 20px;

text-decoration: none;

background: #DDDDDD;

color: #666666;

display: block;

width: 80px;

text-align: center;

}

#nav li a:hover,.bi:hover span{

color: #FFFFFF;

background: #DC4E1B;

}

.bi:hover span{padding-top: 2px;}

</style>

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