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Difference between HttpGet and HttpPost Method

  Posted By : Shailendra Chauhan, 28 Dec 2012
Updated On : 03 Sep 2013
Total Views : 41,287   
Support : All
 

The Hypertext Transfer Protocol (HTTP) is a communication protocol that is designed to enable request-response between clients and servers. Here, a web browser is the client and an application on a computer that hosts a web site is the server

Http GET method

Take an html form named "get_form.htm" and write the following code.

<html>
<head>
<title>Using Http Get Method</title>
</head>
<body>
<form id="frm_get" action=" Receiving_Get_Form.aspx" target="_blank" method="GET" >
<table>
<tr>
<td>First Name : </td> <td><input type="text" id="txtF_Name" name="F_name" /></td>
</tr> <tr>
<td>Last Name : </td> <td><input type=" text" id="txtL_name" name="L_name" /></td>
</tr> <tr>
<td>Email-Id : </td> <td><input type="text" id="txtE_mail" name="E_mail" /></td>
</tr> <tr>
<td>Password: </td> <td><input type="password" id="txtP_word" name="P_word"/> </td>
</tr> <tr>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
 </form> </body>
</html>

When we click submit button of this form, it will be redirected to "Receiving_Get_Form.aspx" in a new window.

Page.Request.QueryString["param_name"]

<%@ page language="C#" AutoEventWireup="true" codeFile="Receiving_ Get_Form.aspx.cs" Inherits="Receiving_ Get_Form"% >
<html>
<head>
<title>Data Received Here </title>
</head>
<body>
<table border="1" cellpadding="6" cellspacing="3" >
<tr>
<td>First Name : </td> <td> <% Response.Write(Page.Request.QueryString["F_name"]); %> </td>
</tr>
<tr>
<td>Last Name : </td> <td> <% Response.Write(Page.Request.QueryString["L_name"]); %> </td>
</tr>
<tr>
<td>Email-Id : </td> <td> <% Response.Write(Page.Request.QueryString["E_mail"]); %> </td>
</tr>
<tr>
<td>Password : </td> <td> <% Response.Write(Page.Request.QueryString["P_word"]); %> </td>
</tr>
</table>
</body>
</html>

The First Name, Last Name, Email-Id and Password text boxes of get_form.htm form will be sent as parameter of query string with the field name are F_name, F_name, E_mail and P_word respectively. The name of query string fields automatically taken from name attribute of each HTML element, so don’t forget to specify the name attribute So that values should be retrieving using Page.Request.QueryString ["param_name"] here in "Receiving_Get_Form.aspx" automatically.

Key points about data submitted by using HttpGet

  1. GET - Requests data from a specified resource

  2. An hyperlink or anchor tag that points to an action will ALWAYS be an HttpGet.

  3. Data is submitted as a part of url.

  4. Data is visible to the user as it posts as query string.

  5. It is not secure but fast and quick.

  6. It use Stack method for passing form variable.

  7. Data is limited to max length of query string.

  8. It is good when you want user to bookmark page.

HttpPost method

The POST request method is designed to request that a web server accepts the data enclosed in the request message's body for storage

Take an html form named “post_form.htm" and write the following code.

</head>
<body>
<form id="frm_post" action=" Receiving_Post_Form.aspx" target="_blank" method=" POST" >
<table>
<tr>
 <td>First Name : </td> <td><input type="text" id="txtF_Name" name="F_name" /></td>
</tr> <tr>
<td>Last Name : </td> <td><input type=" text" id="txtL_name" name="L_name" /></td>
</tr> <tr>
 <td>Email-Id : </td> <td><input type="text" id="txtE_mail" name="E_mail" /></td>
</tr> <tr>
 <td>Password: </td> <td><input type="password" id="txtP_word" name="P_word"/> </td>
</tr> <tr>
<td><input type="submit" value="Submit" /></td>
</tr>
</table>
 </form> </body>
</html>

When we click submit button of this form, it will be redirected to "Receiving_Post_Form.aspx" (opened in new window too). In ASP.NET, if data passed through HTTP Post method we need the following code to retrieve the data (as written in "Receiving_Post_Form.aspx").

Page.Request.Form["param_name"]

<%@ page language="C#" AutoEventWireup="true" codeFile="Receiving_Post_Form.aspx.cs" Inherits=" Receiving_Post_Form"% >
<html>
<head>
<title>Data Received Here </title>
</head>
<body>
<table border="1" cellpadding="6" cellspacing="3" >
<tr>
<td>First Name : </td> <td> <% Response.Write(Page.Request.Form["F_name"]); %> </td>
</tr>
<tr>
<td>Last Name : </td> <td> <% Response.Write(Page.Request.Form["L_name"]); %> </td>
</tr>
<tr>
<td>Email-Id : </td> <td> <% Response.Write(Page.Request. Form["E_mail"]); %> </td>
</tr>
<tr>
<td>Password : </td> <td> <% Response.Write(Page.Request. Form["P_word"]); %> </td>
</tr>
</table>
</body>
</html>

Values of "post_form.htm"(that used method="POST") form sent using POST method therefore, the URL still intact, we retrieve The First Name, Last Name, Email-Id and Password text using Page.Request.Form["param_name"] value taken from the name each of HTML element of second form (Once again don’t forget to specify name attribute for all textboxes so that we are able to get value automatically here in this page). When you click Submit button, values of "post_form.htm" passed to "Receiving_Post_Form.aspx".

Key points about data submitted using HttpPost
  1. POST - Submits data to be processed to a specified resource

  2. A Submit button will always initiate an HttpPost request.

  3. Data is submitted in http request body.

  4. Data is not visible in the url.

  5. It is more secured but slower as compared to GET.

  6. It use heap method for passing form variable

  7. It can post unlimited form variables.

  8. It is advisable for sending critical data which should not visible to users.

What do you think?

I hope you will enjoy the tips. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.

 
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