What is the difference between Httpget and httppost in asp.net mvc

In ASP.NET MVC, HttpGet and HttpPost are attributes used to specify which HTTP method a particular action method will respond to. Here are the main differences between the two:

HttpGet

1. Purpose: Used to retrieve data from the server.
2. Idempotent: Typically, HttpGet requests are idempotent, meaning they do not change the server state.
3. Usage: Commonly used for requests like fetching data, displaying web pages, etc.
4. URL: Parameters are passed in the query string of the URL.
5. Security: Less secure for transmitting sensitive data since data is visible in the URL.

[HttpGet]

public ActionResult Index()

{

    // Logic for handling GET request

    return View();

}

HttpPost

1. Purpose: Used to submit data to the server.
2. Non-idempotent: HttpPost requests can change the server state (e.g., creating or updating resources).
3. Usage: Commonly used for form submissions, sending data to be processed, etc.
4. URL: Parameters are passed in the request body, not in the URL.
5. Security: More secure for transmitting sensitive data since data is not visible in the URL.

[HttpPost]

public ActionResult SubmitForm(FormCollection form)

{

    // Logic for handling POST request

    return RedirectToAction("Index");

}

[HttpPost]

public ActionResult SubmitForm(FormCollection form)

{

    // Logic for handling POST request

    return RedirectToAction("Index");

}

Key Points

• HttpGet should be used for retrieving data without side effects.
• HttpPost should be used when submitting data or making changes to the server's state.
• Mixing the use of HttpGet and HttpPost inappropriately can lead to security issues or unintended side effects.

Example Scenario

For a simple form:

• Display the form (HttpGet):

[HttpGet]

public ActionResult Create()

{

    return View();

}

• Handle form submission (HttpPost):

[HttpPost]

public ActionResult Create(MyModel model)

{

    if (ModelState.IsValid)

    {

        // Save data to the database

        return RedirectToAction("Index");

    }

    return View(model);

}

In this example, the form is displayed with a GET request, and the data submitted through the form is handled with a POST request.