HTTP中的GET和POST之间的区别[重复]

Question

This question already has an answer here:

• Difference between Get and post method in comparision with HTTP and REST 2 answers

There are some posts about the difference between POST and GET, but my problem is more specific, here it is:

I can use GET to send and get data from the server using this VBScript example:

Send "https://www.server.com/send.php"
Sub Send(url)
    Dim objHTTP, MyResponse
    Set objHTTP = CreateObject( "WinHttp.WinHttpRequest.5.1" )
    objHTTP.Open "GET", url, False
    objHTTP.Send "One Plus One"
    MsgBox objHTTP.ResponseText()
End Sub

But this same example works if I change GET with POST, so:

1. What's the difference?
2. What should I use when I want to send and receive data at the same time?

And this is my PHP code on the server if you're interested:

<?php
$stdin = fopen('php://input', 'r');

$Data = '';
while (!feof($stdin))
  $Data .= fread($stdin, 8192);

$Data .= " Equals Two";

echo $Data;
?>

Note that I didn't mention HTML, because my code has nothing to do with it, but if the difference has to do with HTML, I would be happy to know about it.

</div>

Answer 1

A POST request has a body, this body carries the information you are trying to send with the request, and the main advantage of POST is that this data can be quite lengthy, you can even send files.

GET does not have a body, if you want to send any data it has to be carried in the Query String, which is basically the stuff that goes after the ? in the URL. Example:

https://google.com/?q=this+is+the+data

As the data goes in the URL, you cant really put whatever you want there. Most browsers and servers will limit the maximum URL size to something in the order of a few kilobytes, and it is not very useful at all if you intent to post long texts or files.