Java – keyloak missing form parameter: Grant_ type

I ran the keycloak standalone program on my local computer

I created a new realm called "spring test" and then a new client named "login app"

According to the remaining documents:

POST: http://localhost:8080/auth/realms/spring-test/protocol/openid-connect/token

{
    "client_id": "login-app","username": "user123","password": "pass123","grant_type": "password"
}

I should have been given a JWT token, but I got the wrong request and response

{
    "error": "invalid_request","error_description": "Missing form parameter: grant_type"
}

I assume that something is missing from my configuration

Editor: I'm using JSON body, but it should be in the form of URL encoding: how the following institutions work:

token_type_hint:access_token&token:{token}&client_id:{client_id}&client_secret:{client_secret}

Solution

You should send data in the post request and set the content type header value to application / x-www-form-urlencoded instead of JSON