WEBVTT 00:00.450 --> 00:03.030 Welcome back to the Knowledge Portal Video series. 00:03.360 --> 00:09.390 Today we are going to talk about one more Http method called as Post. 00:10.470 --> 00:15.540 In order to understand post, let's take a simple example of a login form. 00:20.290 --> 00:22.150 So this is a simple login form. 00:22.150 --> 00:29.440 We all have gone across a login form when we used to enter a username and password and it can either 00:29.440 --> 00:32.620 allow us to login or it will say incorrect password. 00:33.930 --> 00:36.420 Now during these cases. 00:37.390 --> 00:42.500 So during let's say you open gmail.com and it asks you for a username and password. 00:42.520 --> 00:49.240 So essentially here you have to post some data to the application and click on sign in. 00:49.510 --> 00:55.870 Application will verify whether the username and password that you have entered are correct or not and 00:55.870 --> 01:01.090 depending upon that it will either give you access or it will not give you access. 01:03.760 --> 01:10.960 So in this time, what essentially you are doing is you are posting some data to the application that 01:10.960 --> 01:12.490 is running on the web server. 01:13.120 --> 01:20.830 And during this time is when you use the Http post method because get won't work here. 01:22.930 --> 01:30.580 In a nutshell, a Http post is used to send some data to the server to be processed in some way. 01:31.420 --> 01:39.160 In this example we are posting or we are sending username and password to the application so that the 01:39.160 --> 01:41.410 application can process it. 01:41.410 --> 01:46.240 By process I mean validate whether a username and password are correct. 01:48.580 --> 01:57.280 If we take a look at the example of a login form here instead of get we have post method on login dot 01:57.580 --> 02:05.860 PHP and in the body section we have user is equal to admin and password is equal to test one two, three. 02:06.580 --> 02:11.530 And this is one of the reasons why the http post method is used. 02:12.500 --> 02:18.740 Now let's go to our lab section and see on how post is generally used. 02:20.670 --> 02:21.900 What I'll do is. 02:23.510 --> 02:27.230 Let's open Wireshark and start our packet capture. 02:28.620 --> 02:34.730 I click on Start and go to Mozilla and let's open a simple login form. 02:35.190 --> 02:36.420 Login.html. 02:38.360 --> 02:41.330 And here it is asking for a username and password. 02:41.540 --> 02:44.620 So username and password. 02:44.630 --> 02:50.040 I'll put my password and when I click on login over here it will log me in. 02:50.060 --> 02:55.100 So what essentially we are doing is we are posting our username and password to this particular web 02:55.100 --> 02:58.100 application which will validate it and. 02:59.290 --> 03:01.630 It will either allow us or it will not allow us. 03:01.630 --> 03:03.400 So I'll click on login over here. 03:03.490 --> 03:06.970 And here you see it has allowed us inside. 03:07.480 --> 03:13.810 Now let's look at the Wireshark packet capture and see what has happened behind the scenes. 03:14.800 --> 03:16.420 I'll filter based on Http. 03:18.000 --> 03:20.070 It will be much more simpler. 03:21.310 --> 03:22.240 Initially. 03:22.240 --> 03:28.780 What has happened is our browser has sent a get request to the login.html. 03:29.950 --> 03:34.890 On the web server and the server responded back with the login form. 03:34.900 --> 03:37.180 So this essentially is the login form. 03:37.390 --> 03:38.590 I'll close this. 03:39.190 --> 03:43.540 And now after we have entered the username and password. 03:44.480 --> 03:47.030 The request became post. 03:48.810 --> 03:53.160 So let me filter back to Http. 03:53.190 --> 03:56.760 And if we see over here, there is a post request. 03:56.760 --> 04:03.840 So if I follow the TCP stream now after we enter the username and password, the request essentially 04:03.840 --> 04:04.830 became a post. 04:06.690 --> 04:12.390 And also here you see login is equal to zero and password is equal to password. 04:12.390 --> 04:18.630 So my password was password in plain text and this is the login button. 04:19.140 --> 04:24.120 The server will validate it and it will either allow us or either it will not allow us. 04:24.240 --> 04:30.090 Now this essentially becomes a post request because in the body itself we are giving the username and 04:30.090 --> 04:32.790 password and sending it back to the server. 04:33.780 --> 04:39.000 And this is one of the reasons why the Http post method is used. 04:39.420 --> 04:41.070 So essentially if you see. 04:42.160 --> 04:49.000 Or if you think on where post can be used, then there are endless number of possibilities where http 04:49.000 --> 04:49.870 post is used. 04:50.170 --> 04:56.830 Take for example google.com where you have a search bar and where you enter whatever you want to search 04:56.830 --> 05:01.010 and you click on Google Search and Google will present with you all the results. 05:01.030 --> 05:07.420 So during that time, also essentially the Http post is used because you are posting some data to the 05:07.450 --> 05:08.920 Google application. 05:09.880 --> 05:12.700 This is it about the simple http post. 05:13.710 --> 05:14.420 Request. 05:15.010 --> 05:17.370 I'll suggest you to try this practical. 05:17.370 --> 05:24.150 Also follow the labs that I have given and try to do a wireshark packet capture also. 05:24.720 --> 05:25.650 This is it. 05:25.650 --> 05:26.730 About this lecture. 05:26.730 --> 05:31.200 I hope this has been informative for you and I'd like to thank you for viewing.