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Why Laravel is Throwing MethodNotAllowedHttpException?

Did you know that the ‘MethodNotAllowedHttpException` in Laravel occurs when an HTTP request is sent to a route, but the method used is not explicitly defined in the route configuration?

This error usually occurs when there is a mismatch between the request method (GET, POST, PUT, DELETE) and the defined route.

For example:

Consider the following route definition:

Route::post('/topics', TopicStoreController::class)→name('topics.store');

If we try to visit `/topics` in a browser (which sends a GET request), Laravel will throw a `MethodNotAllowedHttpException` because no GET route exists for this endpoint.

Causes of MethodNotAllowedHttpException

• This error occurs if a route is defined for `GET` but a `POST` request is sent (or vice versa).
• Laravel enforces strict HTTP method definitions, meaning only specified methods can be used for each route.
• Forms, by default, send `POST` requests, which might conflict with a `GET` route.
• Using `Route::resource` incorrectly without ensuring the request aligns with the predefined RESTful methods.

Solutions to Fix MethodNotAllowedHttpException

1. Ensure Matching Route and Request Methods

If we are posting data but defined a `GET` route, adjust the route accordingly:

Route::post('/validate', [MemberController::class, 'validateCredentials']);

Instead of:

Route::get('/validate', 'MemberController@validateCredentials');

2. Separate GET and POST Routes

A better practice is to define separate routes for GET and POST requests:

Route::post('validate', 'MemberController@validateCredentials');
Route::get('validate', function () {
return View::make('members/login');
});


3. Use Named Routes for Better Maintainability

Named routes make it easier to manage routing changes:

Route::post('/validate', [MemberController::class, 'validateCredentials'])→name('member.validateCredentials');

Then, in our Blade view:

<form action="{{ route('member.validateCredentials') }}" method="POST">
@csrf
</form>


4. Handling PATCH and PUT Requests Correctly

When using forms that update data, Laravel expects `PATCH` or `PUT` methods. To handle this, add a hidden `_method` field:

<input name="_method" type="hidden" value="PATCH">

5. Utilizing `Route::resource`

If the controller follows RESTful principles, `Route::resource` automatically manages GET, POST, PUT, and DELETE routes:

Route::resource('file', 'FilesController');

Ensure the form submits to the correct function:

{{ Form::open(array('route' => 'file.store')) }}

6. Explicitly Define Form Methods

If the form needs to send a GET request, specify it explicitly:

Form::open(array('url' => 'foo/bar', 'method' => 'get'))

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Conclusion

A `MethodNotAllowedHttpException` is a common Laravel error caused by mismatches between route definitions and request methods. To avoid this, always verify that the HTTP method used in our form or request matches the method defined in our Laravel routes. Following best practices such as named routes, separating GET and POST routes, and properly handling form submissions can prevent these issues efficiently.

In brief, our Support Experts demonstrated why Laravel is throwing MethodNotAllowedHttpException.