Home php教程 php手册 比一比才知道 GET vs POST

比一比才知道 GET vs POST

Jun 21, 2016 am 08:51 AM
get heap post request url

  1,Get中数据大小被限制:我们都知道很多老式浏览器把URL的字符串个数被限制在255个之内;虽然现在的新版浏览器早就没有这个蛋疼的限制,但是我们可不敢保证所有来站点访问的用户都是使用新版浏览器的。所以当我们需要用户在网页中填写一些信息时,使用Get方式肯定会出问题。相反Post方法中没有这个限制,我们可以传输任意大小的数据。

  2,Get中的数据类型不灵活:因为Get是使用url来传输数据的,那么比如空格字符以及类似&这样的字符就不方便传输。我们可以使用发送前编码,以及接受后解码的方法来解决。

  3,安全性:在Get中,参数是以名值对的查询字符串挂接在url后缀来传输的,所以这个非常容易被浏览器历史记录中查询到。所有的数据也都是以文本方式提交,所以我们知道比如登录操作的密码是绝对不能使用Get方式来提交。

  相反,Post方法就安全多了。所有的名值对都是以消息体的方式在Http Request的方式传输。

  4,速度:显然Get比Post要快。

  5,书签:其实有几个情况下用Get更好,比如你能将名值对参数以书签的方式存储并直接在子啊表单中使用。但在Post下是无法做到的。

  6,以表单方式上传文件只能使用 Post 方式实现,Get几乎不可能。

  7,在服务器对Get方式提交的数据编码时可能会数据丢失。但对于Post是不会的。

  8,Get使用栈方法传输表单变量,而Post使用HEAP方法来传输表单变量。

  9,Get最多也就一次性传输18个参数而Post没有这个限制。



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