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Hello, friends, in this video, we shall see what are the redirect or what is the redirect function

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and what are the different airports that the flask application may encounter?

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So the redirects and the errors.

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The flask module has a function called redirect, the redirect function does exactly the same thing,

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same thing what it redirects the user's browser to another target location.

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Additionally, the reason the redirect function may be specified with a status call, what kind of status

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the redirection may take was the prototype of redirect function is as you know, this is the syntax

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of the redirect function.

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Three parameters are needed.

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What is the location means?

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What the parameter is that you are in the new you are to which your application will be redirected that

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you are.

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The response should be redirected.

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Second parameter is the status quo.

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It this status quo is sent to the brothers here, the Ford is equal to three zero two.

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I'll show you the different different status codes that it may take, the values of which can be used.

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And the third parameter is the response parameter, which is used to create an object of the response

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for the subsequent redirected location.

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So these three parameters are provided to the redirect function.

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The purpose is very obvious from one view function, the another response is created and the browser

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or the web application will be redirected towards the other location.

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That is the purpose of this redirect.

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These are the standardized state of schools, three zero two is the default, and it will be generated

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or that will be sent as an argument.

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When the desire Eurail is found, other options are three zero zero.

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Then there are multiple choices.

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Three zero one is a status quo.

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When the required rate is moved permanently, it is no more available.

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Three zero three is rather not modified use proxy generally used by the status quo.

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Three zero six it is for reserve and three zero seven is used when there is a temporary redirect.

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So along with these status courts, most of most often use these three to do it is by default.

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You know, if you do not mention it is always treasurable.

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So such a redirect function.

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I now use this related function to take the client's control, rather the server applications control

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from one you are to the other.

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You are all with the help of a redirect function that redirect use.

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I would sure with the help of an example.

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In this example, we shall see the use of redirect function, which is a part of the last module.

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So all the requirements are to be imported first.

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In addition to the flask of class.

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The redirect function, you are ill for function, render rendered template function and request object,

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these are all the requirements.

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Then you start your.

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Plus, application by setting up a flask application object.

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Then in this script.

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These three you are rules are defined by the rules, the character, the slash.

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Which is.

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Bound to the View Function Index.

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It does nothing it renders a template called the login, that e-mail, which is a form in which the

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user can enter the username.

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So localhost Callon 5000 slash, if you will, there is this template will be displayed on your browser

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providing you.

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A textbook to enter the username and put it under the submit button, so this login, not e-mail submit

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button will.

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Take you to the hyperlinked login, so this is the second you are a rule that has been defined.

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So if you come to this logging slash logging, you are all by using the post method, which is.

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A part of the attribute of the form which is present in the logging that is also the matter that will

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be used will be post so.

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This will be true.

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And if the request not form, that means the form in this log, in not e-mail.

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In which there is a text box and the user has entered the user name as admin, then.

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Slash logging route will be redirected towards another Eurail, which is the model for success.

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So use the you are ill for function.

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Success is the.

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Metadata that has been defined.

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What is the URL for that success?

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So what will happen on your browser?

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A message will be displayed as login successfully.

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Right, but for example, let us say the user direct directly enters this.

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You are in his brother localhost 5000 slash login, so that means what the matter is not post on the

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other end, the method will be get the default method is remember the get method.

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So this will not be executed.

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The login function will execute this statement and the browser will be redirected towards the back to

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the index you are in.

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That means this one again, the login e-mail will be displayed for him to log in again.

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So in the effect, what is happening?

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This logged in successfully message will appear only if the user name has been given as admin to any

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other user name, it will.

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Larry, you know, reappear what will reappear, the login form will reappear, continue to reappear

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till you give that username Asami.

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OK, so this is the.

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Example of redirect, let us see how it goes.

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So the Python script for this exercise is named as related, not what started.

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Will start.

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Go to the browser and.

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It is you are a local lost fighter slash.

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So you are on the browser localhost 5000 is the URL, given that the Xbox.

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This is the largest crowd estimate that will be rendered by using the intertemporal function.

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Now, I will show both those situations or scenarios are possibilities.

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One is I give you a username, something like this.

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What is going to happen, this submit button will take you to the Log-in you are in.

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Along with the metal attribute equal to post.

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So the if condition will fail, even though the metal is post, the username is not admin, so this

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is bound to reappear again.

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OK, now, in the second situation or second case, I give the.

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Your name is Ahmed again, if I.

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Press log-in.

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You will be redirected towards the new wall along with the.

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Metal post, so the border conditions are through metal exposed username is Erdmann, so it will now

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be redirected toward the success Eurail.

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The message that will be displayed will be logged in successfully.

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On the other night, I said, if I were directly you.

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Slash Log-in.

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What is going to happen that you will be redirected towards the logging, you are ill, but the metal

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will not be pushed, so therefore.

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The luggage will reappear, so all the three possibilities I will demonstrate here with the help of

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the redirect function will come back just as the redirection feature is present in a flask application.

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The flask also has a board function.

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This abort function enables an early exit of the application and while exiting it can.

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You know, emit a certain airport, it will accept the application with a certain error code, the use

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is very simple abort.

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It will take only one parameter, which is the error call.

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These are different airports that are frequently used for zero.

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Zero is a bad request.

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That means when you are trying to access a U-Haul, which is not present, unauthenticated when the

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user with a certain set of privileges is not allowed to access a particular location, then four zero

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one will be the airport forbidden or zero one four zero four is a very commonly encountered airport.

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When the required resources is not not found at all, four zero four four zero four six is not acceptable

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for one.

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Five is unsupported media type and unfortunately there are too many requests.

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So I just listed out a few of those airports that your application may encounter when the application

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is required to have an early exit out of that application.

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So a small example is there which will show up and the use of the abort function that I will show with

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the help of a very small example here in this example, the use of abort function, which is a part

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of the last module that is being demonstrated here.

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So in addition to the other resources to import the abort function from the last module, this is,

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of course, the initialization of the application object.

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The.

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The court here is more or less similar to what we used as a as an example of a redirect function here.

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Also, there is an index rule.

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The backslash rule is.

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Attached to the new function index, which in turn will render a template called Log-in Dot Estevan,

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which login that e-mail, as you know, the login e-mail has a simple form with a text box and a button.

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The user is asked to enter a username that's.

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Right, but the in that estimate of the form in this log, in our e-mail will take you to the you are

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logging.

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The action attribute of this log into the e-mail form is.

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Towards the logging slash logging ordeal, along with the metal to post.

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OK, so when the user.

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Click on the submit button, along with some data entered in the username, feel this you are and will

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be accessed along with the post method.

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So this condition will be the the associated new function will be executed in this function.

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This condition is going to be true.

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Now, inside with another, there is another condition.

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If the form request, not form username, that means the text box in the login form inside that if you

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have pressed your type of the admin as the name of the user or username, then second condition will

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be true.

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If this is true, the browser will be redirected towards the.

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You function the you are for the you function success, this is that success you are in.

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Associated with functioning success, what will be have what will be displayed and successfully will

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be displayed when.

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When the user enters the user name as admin.

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If not.

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Let me see if this condition is not true.

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The matter, of course, is post, but the value entered in the user name is not admin.

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So that means this else will be executed and.

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Italy and Canada and Abbott function with the error call for zero one and four zero one is for unauthorized.

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So on your browser, a message unauthorized will be displayed.

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Right.

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And, of course, as we saw in the last example, if the user directly enters logging in the Urals sorry,

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the browser's address bar, then.

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The matter is not so, therefore, this girls will be executed and it will again take you back to the

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index where again the login page will be displayed, the form in which the username has to be entered.

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OK, so importantly, we have to verify what happens as a result of this abort function for zero one,

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is there a report that has been given?

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So you should see the unauthorized.

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Message being displayed on the browser if the username is not Al.

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That will be the verification of the award function.

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OK.

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So the.

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Transcript in which the abort function is used is called Abort Not Be, so I will start it so that the

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server will start running.

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Once it is running, we'll go to the browser.

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Give the you are localhost 5000 slash.

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The in that e-mail will be displayed.

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Now, I will show you both those situations where the first place you enter the username has admin.

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What happens, the logging, you will redirect your words, redirect you towards the success you are

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handed, the message printed will be logged in successfully.

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OK, so this is one Edvin.

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He's a username, Log-in is successful again, go back to this.

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Login page, now enter something else, something other than admin.

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So I will say user.

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If I click on it, it will redirect towards the logging, but is still post, but the username is not

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admin, so therefore it will encounter the airport with four zero one airport.

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So it will an unauthorized.

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This is the message that comes along with that there's a different reasons why you may be unauthorized.

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So that happens when.

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Iraqi authorities, four zero 01.

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And, of course, if you directly localhost by southern Log-in.

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Then, of course, what will happen, it will again go back to the login form.

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Like this.

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So this demonstrates the use of board function in the flask.