POST to endpoint return 400

[balakhorvathnorbert]

Hi, I am new to Lucky and I am building an API-only backend. I have generated the app with Authentication. I am not quite sure what I am missing here. Thanks in advance.

Crystal version:
Crystal 1.4.0 (2022-04-06)

LLVM: 13.0.1
Default target: aarch64-apple-darwin21.4.0

Lucky version:
0.30.0

When posting JSON in body using nested params to endpoint, it return 400:

web          |  ▸ Handled by Api::SignIns::Create
web          |  ▸  Lucky::MissingNestedParamError 
web          | 
web          |      Missing param key: 'user'
web          | 
web          |     Backtrace 
web          | 
web          |      lib/lucky/src/lucky/params.cr:239:7 in 'nested'
web          |      lib/avram/src/avram/attribute.cr:102:21 in 'extract'
web          |      lib/avram/src/avram/attribute.cr:85:5 in 'extract'
web          |      src/operations/sign_in_user.cr:7:3 in '_password'
web          |      src/operations/sign_in_user.cr:7:3 in 'password'
web          |      src/operations/sign_in_user.cr:7:3 in 'attributes'
web          |      lib/avram/src/avram/operation.cr:102:29 in 'valid?'
web          |      lib/avram/src/avram/operation.cr:59:8 in 'call'
web          |      lib/lucky/src/lucky/renderable.cr:136:16 in 'perform_action'
web          |      lib/lucky/src/lucky/route_handler.cr:10:7 in 'call'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server/handler.cr:28:7 in 'call_next'
web          |      lib/lucky/src/lucky/remote_ip_handler.cr:26:5 in 'call'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server/handler.cr:28:7 in 'call_next'
web          |      lib/lucky/src/lucky/error_handler.cr:14:5 in 'call'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server/handler.cr:28:7 in 'call_next'
web          |      lib/lucky/src/lucky/log_handler.cr:34:9 in 'call'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server/handler.cr:28:7 in 'call_next'
web          |      lib/lucky/src/lucky/http_method_override_handler.cr:11:5 in 'call'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server/handler.cr:28:7 in 'call_next'
web          |      lib/lucky/src/lucky/force_ssl_handler.cr:37:7 in 'call'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server/handler.cr:28:7 in 'call_next'
web          |      lib/lucky/src/lucky/request_id_handler.cr:24:5 in 'call'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server/request_processor.cr:51:11 in 'process'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server.cr:515:5 in 'handle_client'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/http/server.cr:468:13 in '->'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/fiber.cr:146:11 in 'run'
web          |      /opt/homebrew/Cellar/crystal/1.4.0/src/fiber.cr:98:34 in '->'
web          | 
web          |  ▸ Sent 400 Bad Request (1.67ms)```

POSTMAN BODY:
```{
  "user": {
    "email": "[email protected]",
    "password": "Tachy1981"
  }
}```

POSTMAN Response:
```{
    "message": "Missing param key: 'user'",
    "param": null,
    "details": null
}```

**When sending as form data in Postman, the request returns 200 when appending the user key to the fields as the following:**
`user:email: [email protected]`
`user:password: password`

[jwoertink]

I believe this was answered in Discord. The Content-Type or Accept header wasn't set to json?