关于application/x-www-form-urlencoded
作为form表单的一种数据格式，application/x-www-form-urlencoded 有其自己的特点
<form action="handle.php" method="post" >
<input type="text" name="uname" class="uname" /><br />
<input type="text" name="email" class="email" /><br />
<textarea rows="5" cols="5" name="txt"></textarea><br />
<input type="submit" name="submit" value="提交"/>
</form>
如果不指定 enctype的值，那么其默认值就是application/x-www-form-urlencoded,当然此种数据格式不能支持文件的上传，如果我们需要同时上传文件的话，我们可以手动指定enctype=”multipart/form-data”。
图二
从图二中可以验证其替换规则
当使用GET方式请求的时候，form表单数据按照application/x-www-form-urlencoded编码以后被追加在请求地址后面用‘？’分割。
下面我们来简单说一下enctype的第三个值 text/plain。此编码方式和application/x-www-form-urlencoded 相似，只是text/plain 只对换行符和空格进行相应替换，并不对特殊字符编码，上例中的汉字就不会被编码
并且，如果是以post方式请求的话，消息体中的并不会对name和value重组成name=value&name=value 的形式。
以上就是form表单的application/x-www-form-urlencoded编码的简要介绍，欢迎大家在下面留言，共同讨论，共同进步。
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