Configuring Keycloak with OAuth2 and PKCE (login, register page not found)

Configuring the server
1

Hello Everyone,

I am trying to configure my Keycloak server for OAuth2 with PKCE.

I have followed various tutorials and I followed these steps:

  1. Create Realm ( test )
  2. Create Client (test-client )
  3. Set Client Authentication OFF → public
  4. Choose Standard Flow
  5. Set Redirect URI (http://localhost:4200)
  6. Set Proof Key for Code Exchange Code Challenge Method → S256
  7. Enable Register Flow in Realm Settings

Now I try to access my register page with a URL I am creating in a small script (python):

import base64
import hashlib
import os

def generate_code_challenge():
    # Generate a random code_verifier
    code_verifier = base64.urlsafe_b64encode(os.urandom(40)).decode('utf-8').replace('=', '')
    
    # Create a code_challenge based on the code_verifier
    code_challenge = hashlib.sha256(code_verifier.encode('utf-8')).digest()
    code_challenge = base64.urlsafe_b64encode(code_challenge).decode('utf-8').replace('=', '')
    
    return code_challenge

code_challenge = generate_code_challenge()

auth_url = (
    "http://localhost:8080/auth/realms/test/protocol/openid-connect/auth?"
    "client_id=test-client&"
    "response_type=code&"
    "scope=openid&"
    "redirect_uri=http://localhost:4200&"
    f"code_challenge={code_challenge}&"
    "code_challenge_method=S256"
)

register_url = (
    "http://localhost:8080/auth/realms/test/protocol/openid-connect/registrations?"
    "client_id=test-client&"
    "response_type=code&"
    "scope=openid&"
    "redirect_uri=http://localhost:4200&"
    f"code_challenge={code_challenge}&"
    "code_challenge_method=S256"
)

print(auth_url)
print(register_url)

I get the following urls:

When I try to enter them I get a Page not found. This worked in an earlier version I have used before 17.0.0.

I am using version 23.0.1 now.

Thank you in advance.

Regards,
Angelo from Germany

2

Hello Everyone,

the issue is resolved with removing the first /auth

So http://localhost:8080/realms/…