diff --git a/README.md b/README.md
index 47deb30..2a208d3 100644
--- a/README.md
+++ b/README.md
@@ -37,33 +37,40 @@ npm install nest-keycloak-connect keycloak-connect --save
 ### Module registration
 
 Registering the module:
+
 ```typescript
 KeycloakConnectModule.register({
   authServerUrl: 'http://localhost:8080', // might be http://localhost:8080/auth for older keycloak versions
   realm: 'master',
   clientId: 'my-nestjs-app',
-  secret: 'secret',   
+  secret: 'secret',
   policyEnforcement: PolicyEnforcementMode.PERMISSIVE, // optional
   tokenValidation: TokenValidation.ONLINE, // optional
-})
+});
 ```
 
 Async registration is also available:
+
 ```typescript
 KeycloakConnectModule.registerAsync({
   useExisting: KeycloakConfigService,
-  imports: [ConfigModule]
-})
+  imports: [ConfigModule],
+});
 ```
 
 #### KeycloakConfigService
+
 ```typescript
 import { Injectable } from '@nestjs/common';
-import { KeycloakConnectOptions, KeycloakConnectOptionsFactory, PolicyEnforcementMode, TokenValidation } from 'nest-keycloak-connect';
+import {
+  KeycloakConnectOptions,
+  KeycloakConnectOptionsFactory,
+  PolicyEnforcementMode,
+  TokenValidation,
+} from 'nest-keycloak-connect';
 
 @Injectable()
 export class KeycloakConfigService implements KeycloakConnectOptionsFactory {
-
   createKeycloakConnectOptions(): KeycloakConnectOptions {
     return {
       authServerUrl: 'http://localhost:8080', // might be http://localhost:8080/auth for older keycloak versions
@@ -73,7 +80,7 @@ export class KeycloakConfigService implements KeycloakConnectOptionsFactory {
       policyEnforcement: PolicyEnforcementMode.PERMISSIVE,
       tokenValidation: TokenValidation.ONLINE,
     };
-  } 
+  }
 }
 ```
 
@@ -83,7 +90,7 @@ You can also register by just providing the `keycloak.json` path and an optional
 KeycloakConnectModule.register(`./keycloak.json`, {
   policyEnforcement: PolicyEnforcementMode.PERMISSIVE,
   tokenValidation: TokenValidation.ONLINE,
-})
+});
 ```
 
 ### Guards
@@ -91,11 +98,13 @@ KeycloakConnectModule.register(`./keycloak.json`, {
 Register any of the guards either globally, or scoped in your controller.
 
 #### Global registration using APP_GUARD token
-***NOTE: These are in order, see https://docs.nestjs.com/guards#binding-guards for more information.***
+
+**_NOTE: These are in order, see https://docs.nestjs.com/guards#binding-guards for more information._**
+
 ```typescript
 providers: [
   {
-    provide: APP_GUARD,     
+    provide: APP_GUARD,
     useClass: AuthGuard,
   },
   {
@@ -106,9 +115,11 @@ providers: [
     provide: APP_GUARD,
     useClass: RoleGuard,
   },
-]
+];
 ```
+
 #### Scoped registration
+
 ```typescript
 @Controller('cats')
 @UseGuards(AuthGuard, ResourceGuard)
@@ -118,14 +129,17 @@ export class CatsController {}
 ## What does these providers do ?
 
 ### AuthGuard
+
 Adds an authentication guard, you can also have it scoped if you like (using regular `@UseGuards(AuthGuard)` in your controllers). By default, it will throw a 401 unauthorized when it is unable to verify the JWT token or `Bearer` header is missing.
 
 ### ResourceGuard
+
 Adds a resource guard, which is permissive by default (can be configured see [options](#nest-keycloak-options)). Only controllers annotated with `@Resource` and methods with `@Scopes` are handled by this guard.
 
-***NOTE: This guard is not necessary if you are using role-based authorization exclusively. You can use role guard exclusively for that.***
+**_NOTE: This guard is not necessary if you are using role-based authorization exclusively. You can use role guard exclusively for that._**
 
 ### RoleGuard
+
 Adds a role guard, **can only be used in conjunction with resource guard when enforcement policy is PERMISSIVE**, unless you only use role guard exclusively.
 Permissive by default. Used by controller methods annotated with `@Roles` (matching can be configured)
 
@@ -134,7 +148,13 @@ Permissive by default. Used by controller methods annotated with `@Roles` (match
 In your controllers, simply do:
 
 ```typescript
-import { Resource, Roles, Scopes, Public, RoleMatchingMode } from 'nest-keycloak-connect';
+import {
+  Resource,
+  Roles,
+  Scopes,
+  Public,
+  RoleMatchingMode,
+} from 'nest-keycloak-connect';
 import { Controller, Get, Delete, Put, Post, Param } from '@nestjs/common';
 import { Product } from './product';
 import { ProductService } from './product.service';
@@ -188,7 +208,7 @@ export class ProductController {
 Here is the decorators you can use in your controllers.
 
 | Decorator          | Description                                                                                               |
-|--------------------|-----------------------------------------------------------------------------------------------------------|
+| ------------------ | --------------------------------------------------------------------------------------------------------- |
 | @AuthenticatedUser | Retrieves the current Keycloak logged-in user. (must be per method, unless controller is request scoped.) |
 | @EnforcerOptions   | Keycloak enforcer options.                                                                                |
 | @Public            | Allow any user to use the route.                                                                          |
@@ -197,7 +217,9 @@ Here is the decorators you can use in your controllers.
 | @Roles             | Keycloak realm/application roles.                                                                         |
 
 ## Multi tenant configuration
+
 Setting up for multi-tenant is configured as an option in your configuration:
+
 ```typescript
 {
   authServerUrl: 'http://localhost:8180/auth',
@@ -207,9 +229,13 @@ Setting up for multi-tenant is configured as an option in your configuration:
     realmResolver: (request) => {
       return request.get('host').split('.')[0];
     },
-    realmSecretResolver: (realm) => {
+    realmSecretResolver: (realm, request) => {
       const secrets = { master: 'secret', slave: 'password' };
       return secrets[realm];
+    },
+    realmAuthServerUrlResolver: (realm, request) => {
+      const authServerUrls = { master: 'https://master.local/auth', slave: 'https://slave.local/auth' };
+      return authServerUrls[realm];
     }
   }
 }
@@ -218,25 +244,29 @@ Setting up for multi-tenant is configured as an option in your configuration:
 ## Configuration options
 
 ### Keycloak Options
+
 For Keycloak options, refer to the official [keycloak-connect](https://github.com/keycloak/keycloak-nodejs-connect/blob/main/middleware/auth-utils/config.js) library.
 
 ### Nest Keycloak Options
-| Option            | Description                                                                         | Required | Default      |
-|-------------------|-------------------------------------------------------------------------------------|----------|--------------|
-| cookieKey         | Cookie Key                                                                          | no       | KEYCLOAK_JWT |
-| logLevels         | Built-in logger level (deprecated, will be removed in 2.0)                          | no       | log          |
-| useNestLogger     | Use the nest logger (deprecated, will be removed in 2.0)                            | no       | true         |
-| policyEnforcement | Sets the policy enforcement mode                                                    | no       | PERMISSIVE   |
-| tokenValidation   | Sets the token validation method                                                    | no       | ONLINE       |
-| multiTenant       | Sets the options for [multi-tenant configuration](#multi-tenant-options)            | no       | -            |
-| roleMerge         | Sets the merge mode for @Role decorator                                             | no       | OVERRIDE     |
+
+| Option            | Description                                                              | Required | Default      |
+| ----------------- | ------------------------------------------------------------------------ | -------- | ------------ |
+| cookieKey         | Cookie Key                                                               | no       | KEYCLOAK_JWT |
+| logLevels         | Built-in logger level (deprecated, will be removed in 2.0)               | no       | log          |
+| useNestLogger     | Use the nest logger (deprecated, will be removed in 2.0)                 | no       | true         |
+| policyEnforcement | Sets the policy enforcement mode                                         | no       | PERMISSIVE   |
+| tokenValidation   | Sets the token validation method                                         | no       | ONLINE       |
+| multiTenant       | Sets the options for [multi-tenant configuration](#multi-tenant-options) | no       | -            |
+| roleMerge         | Sets the merge mode for @Role decorator                                  | no       | OVERRIDE     |
 
 ### Multi Tenant Options
-| Option              | Description                                                                                             | Required | Default      |
-|---------------------|---------------------------------------------------------------------------------------------------------|----------|--------------|
-| resolveAlways       | Option to always resolve the realm and secret. Disabled by default.                                     | no       | false        |
-| realmResolver       | A function that passes a request (from respective platform i.e express or fastify) and returns a string | yes      | -            |
-| realmSecretResolver | A function that passes the realm string and returns the secret string                                   | yes      | -            |
+
+| Option                     | Description                                                                                             | Required | Default |
+| -------------------------- | ------------------------------------------------------------------------------------------------------- | -------- | ------- |
+| resolveAlways              | Option to always resolve the realm and secret. Disabled by default.                                     | no       | false   |
+| realmResolver              | A function that passes a request (from respective platform i.e express or fastify) and returns a string | yes      | -       |
+| realmSecretResolver        | A function that passes the realm string, and an optional request and returns the secret string          | no       | -       |
+| realmAuthServerUrlResolver | A function that passes the realm string, and an optional request and returns the auth server url string | no       | -       |
 
 ## Example app