HTTP 405 Method Not Allowed Error When Connecting to Laravel MCP Server

[clablancherie-exo]

Laravel Package Version

0.1.1

Laravel Version

12.11.1

PHP Version

8.3.24

Database Driver & Version

HTTP 405 Method Not Allowed Error When Connecting to Laravel MCP Server

Description

I'm encountering a persistent HTTP 405 error when trying to connect to my Laravel MCP server, even when explicitly using POST requests. The error message suggests a mismatch between the expected and actual HTTP methods.

Error Details

Error from MCP server: Error: Error POSTing to endpoint (HTTP 405): {
    "message": "The GET method is not supported for route mcp/demo. Supported methods: POST.",
    "exception": "Symfony\\Component\\HttpKernel\\Exception\\MethodNotAllowedHttpException",
    "file": "/path/to/vendor/laravel/framework/src/Illuminate/Routing/AbstractRouteCollection.php",
    "line": 123,
}

Steps To Reproduce

1. Set up a Laravel MCP server with a POST route defined as: Route::post('/mcp/demo', [Controller::class, 'method']);
2. Attempt to connect using the MCP client
3. Alternatively, test directly with Postman using an explicit POST request
4. Receive the same 405 error in both cases

[crynobone]

Hey there, thanks for reporting this issue.

We'll need more info and/or code to debug this further. Can you please create a repository with the command below, commit the code that reproduces the issue as one separate commit on the main/master branch and share the repository here?

Please make sure that you have the latest version of the Laravel installer in order to run this command. Please also make sure you have both Git & the GitHub CLI tool properly set up.

laravel new bug-report --github="--public"

Do not amend and create a separate commit with your custom changes. After you've posted the repository, we'll try to reproduce the issue.

Thanks!