diff --git a/docker-compose.yml b/docker-compose.yml
index 81c3fcda..c0aec05e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -104,6 +104,7 @@ services:
       KEYCLOAK_USER: admin
       KEYCLOAK_PASSWORD: Pa55w0rd
       KEYCLOAK_IMPORT: /opt/jboss/keycloak/imports/realm-export.json -Dkeycloak.profile.feature.upload_scripts=enabled
+      PROXY_ADDRESS_FORWARDING: 'true'
     healthcheck:
       test:
         [
diff --git a/package-lock.json b/package-lock.json
index 83a9f865..f1267b1f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9298,9 +9298,9 @@
       }
     },
     "tmpl": {
-      "version": "1.0.4",
-      "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.4.tgz",
-      "integrity": "sha1-I2QN17QtAEM5ERQIIOXPRA5SHdE=",
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.5.tgz",
+      "integrity": "sha512-3f0uOEAQwIqGuWW2MVzYg8fV/QNnc/IpuJNG837rLuczAaLVHslWHZQj4IGiEl5Hs3kkbhwL9Ab7Hrsmuj+Smw==",
       "dev": true
     },
     "to-fast-properties": {
diff --git a/public/src/api/httpClient.ts b/public/src/api/httpClient.ts
index 8882249e..c8eda47e 100644
--- a/public/src/api/httpClient.ts
+++ b/public/src/api/httpClient.ts
@@ -51,7 +51,7 @@ export function postSubscriptions(email: string): Promise<any> {
 
 export function postUser(data: RegistrationUser): Promise<any> {
   return makeApiRequest({
-    url: ApiUrl.Users,
+    url: `${ApiUrl.Users}/${data.op}`,
     method: 'post',
     data
   });
diff --git a/public/src/api/makeApiRequest.ts b/public/src/api/makeApiRequest.ts
index e1b9b8ec..ba6941b3 100644
--- a/public/src/api/makeApiRequest.ts
+++ b/public/src/api/makeApiRequest.ts
@@ -15,18 +15,27 @@ export function makeApiRequest<T>(
       return response.data;
     })
     .catch((error) => {
-      if (error.response.status === 401) {
-        sessionStorage.removeItem('email');
-        sessionStorage.removeItem('token');
-        return {
-          ...error,
-          errorText:
-            'Authentication failed, please check your credentials and try again'
-        };
+      switch (error.response.status) {
+        case 401:
+          sessionStorage.removeItem('email');
+          sessionStorage.removeItem('token');
+          return {
+            ...error,
+            errorText:
+              'Authentication failed, please check your credentials and try again'
+          };
+          break;
+        case 409:
+          return {
+            ...error,
+            errorText: 'User already exists'
+          };
+          break;
+        default:
+          return {
+            ...error,
+            errorText: 'Something went wrong. Please try again later'
+          };
       }
-      return {
-        ...error,
-        errorText: 'Something went wrong. Please try again later'
-      };
     });
 }
diff --git a/public/src/interfaces/User.ts b/public/src/interfaces/User.ts
index 9598f008..2eb339ca 100644
--- a/public/src/interfaces/User.ts
+++ b/public/src/interfaces/User.ts
@@ -25,4 +25,5 @@ export interface RegistrationUser {
   lastName: string;
   firstName: string;
   password?: string;
+  op?: LoginFormMode;
 }
diff --git a/public/src/pages/auth/Login/Login.tsx b/public/src/pages/auth/Login/Login.tsx
index 301806b9..1a811639 100644
--- a/public/src/pages/auth/Login/Login.tsx
+++ b/public/src/pages/auth/Login/Login.tsx
@@ -58,10 +58,6 @@ export const Login: FC = () => {
     const { value } = target as HTMLSelectElement & { value: LoginFormMode };
     setForm({ ...form, op: value });
     setMode(value);
-    switch (value as LoginFormMode) {
-      default:
-        return;
-    }
   };
 
   const sendUser = (e: FormEvent) => {
diff --git a/public/src/pages/auth/Register/Register.tsx b/public/src/pages/auth/Register/Register.tsx
index 205192a9..909e7b61 100644
--- a/public/src/pages/auth/Register/Register.tsx
+++ b/public/src/pages/auth/Register/Register.tsx
@@ -1,6 +1,6 @@
 import React, { FC, FormEvent, useState } from 'react';
 import { postUser } from '../../../api/httpClient';
-import { RegistrationUser } from '../../../interfaces/User';
+import { RegistrationUser, LoginFormMode } from '../../../interfaces/User';
 import AuthLayout from '../AuthLayout';
 import { Link } from 'react-router-dom';
 import showRegResponse from './showRegReponse';
@@ -9,7 +9,8 @@ const defaultUser: RegistrationUser = {
   email: '',
   firstName: '',
   lastName: '',
-  password: ''
+  password: '',
+  op: LoginFormMode.BASIC
 };
 
 export const Register: FC = () => {
@@ -17,22 +18,51 @@ export const Register: FC = () => {
   const { email, firstName, lastName, password } = form;
 
   const [regResponse, setRegResponse] = useState<RegistrationUser | null>();
+  const [errorText, setErrorText] = useState<string | null>();
+
+  const [authMode, setAuthMode] = useState<LoginFormMode>(LoginFormMode.BASIC);
 
   const onInput = ({ target }: { target: EventTarget | null }) => {
     const { name, value } = target as HTMLInputElement;
     setForm({ ...form, [name]: value });
   };
 
+  const onAuthModeChange = ({ target }: { target: EventTarget | null }) => {
+    const { value } = target as HTMLSelectElement & { value: LoginFormMode };
+    setForm({ ...form, op: value });
+    setAuthMode(value);
+  };
+
   const sendUser = (e: FormEvent) => {
     e.preventDefault();
 
-    postUser(form).then((data) => setRegResponse(data));
+    postUser(form).then((data) => {
+      setRegResponse(data);
+      setErrorText(data.errorText);
+    });
   };
 
   return (
     <AuthLayout>
       <div className="login-form">
         <form onSubmit={sendUser}>
+          <div className="form-group">
+            <label>Registration Type</label>
+            <select
+              className="form-control"
+              name="op"
+              placeholder="Authentication Type"
+              value={authMode}
+              onChange={onAuthModeChange}
+            >
+              <option value={LoginFormMode.BASIC}>
+                Simple REST-based Registration
+              </option>
+              <option value={LoginFormMode.OIDC}>
+                Simple OIDC-based Registration
+              </option>
+            </select>
+          </div>
           <div className="form-group">
             <label>First name</label>
             <input
@@ -68,7 +98,7 @@ export const Register: FC = () => {
               onInput={onInput}
             />
           </div>
-
+          {errorText && <div className="error-text">{errorText}</div>}
           <div className="form-group">
             <label>Password</label>
             <input
diff --git a/src/keycloak/keycloak.service.ts b/src/keycloak/keycloak.service.ts
index d1539e99..54735776 100644
--- a/src/keycloak/keycloak.service.ts
+++ b/src/keycloak/keycloak.service.ts
@@ -13,6 +13,7 @@ import * as jwkToPem from 'jwk-to-pem';
 import { JWK } from 'jwk-to-pem';
 import { stringify } from 'querystring';
 import { verify } from 'jsonwebtoken';
+import { User } from 'src/model/user.entity';
 
 export interface OIDCIdentityConfig {
   issuer?: string;
@@ -28,6 +29,10 @@ export interface RegisterUserData {
   password: string;
 }
 
+export interface ExistingUserData {
+  email: string;
+}
+
 export interface GenerateTokenData {
   username: string;
   password: string;
@@ -137,17 +142,35 @@ export class KeyCloakService implements OnModuleInit {
     });
   }
 
+  public async isUserExists({ email }: ExistingUserData): Promise<boolean> {
+    this.log.debug(`Called isUserExist`);
+
+    const { access_token, token_type } = await this.generateToken();
+
+    const [existingUser]: unknown[] = await this.httpClient.get(
+      `${this.server_uri}/admin/realms/${this.realm}/users?email=${email}`,
+      {
+        headers: {
+          'Content-Type': 'application/json',
+          Authorization: `${token_type} ${access_token}`,
+        },
+        responseType: 'json',
+      },
+    );
+    return !!existingUser;
+  }
+
   public async registerUser({
     firstName,
     lastName,
     email,
     password,
-  }: RegisterUserData): Promise<void> {
+  }: RegisterUserData): Promise<User> {
     this.log.debug(`Called registerUser`);
 
     const { access_token, token_type } = await this.generateToken();
 
-    await this.httpClient.post(
+    return this.httpClient.post(
       `${this.server_uri}/admin/realms/${this.realm}/users`,
       {
         firstName,
diff --git a/src/users/api/CreateUserRequest.ts b/src/users/api/CreateUserRequest.ts
index a6e6dbd2..37a123ea 100644
--- a/src/users/api/CreateUserRequest.ts
+++ b/src/users/api/CreateUserRequest.ts
@@ -4,4 +4,5 @@ import { UserDto } from './UserDto';
 export class CreateUserRequest extends UserDto {
   @ApiProperty()
   password: string;
+  op: string;
 }
diff --git a/src/users/api/UserDto.ts b/src/users/api/UserDto.ts
index 99ffe965..50c999a4 100644
--- a/src/users/api/UserDto.ts
+++ b/src/users/api/UserDto.ts
@@ -1,5 +1,4 @@
 import { ApiProperty } from '@nestjs/swagger';
-import { User } from '../../model/user.entity';
 
 export class UserDto {
   @ApiProperty()
@@ -11,11 +10,11 @@ export class UserDto {
   @ApiProperty()
   lastName: string;
 
-  public static convertToApi(user: User): UserDto {
-    return {
-      email: user.email,
-      firstName: user.firstName,
-      lastName: user.lastName,
-    };
+  constructor(
+    params: {
+      [P in keyof UserDto]: UserDto[P];
+    },
+  ) {
+    Object.assign(this, params);
   }
 }
diff --git a/src/users/users.controller.ts b/src/users/users.controller.ts
index b66a9adf..8255756a 100644
--- a/src/users/users.controller.ts
+++ b/src/users/users.controller.ts
@@ -3,6 +3,7 @@ import {
   Controller,
   Get,
   Header,
+  HttpException,
   HttpStatus,
   InternalServerErrorException,
   Logger,
@@ -59,7 +60,7 @@ export class UsersController {
   async getUser(@Param('email') email: string): Promise<UserDto> {
     try {
       this.logger.debug(`Find a user by email: ${email}`);
-      return UserDto.convertToApi(await this.usersService.findByEmail(email));
+      return new UserDto(await this.usersService.findByEmail(email));
     } catch (err) {
       throw new InternalServerErrorException({
         error: err.message,
@@ -150,10 +151,10 @@ export class UsersController {
       throw new NotFoundException('User not found in ldap');
     }
 
-    return users.map<UserDto>(UserDto.convertToApi);
+    return users.map((user: User) => new UserDto(user));
   }
 
-  @Post()
+  @Post('/basic')
   @ApiOperation({
     description: 'creates user',
   })
@@ -163,9 +164,15 @@ export class UsersController {
   })
   async createUser(@Body() user: CreateUserRequest): Promise<UserDto> {
     try {
-      this.logger.debug(`Create a user: ${user}`);
+      this.logger.debug(`Create a basic user: ${user}`);
 
-      const newUser = UserDto.convertToApi(
+      const userExists = await this.usersService.findByEmail(user.email);
+
+      if (userExists) {
+        throw new HttpException('User already exists', 409);
+      }
+
+      return new UserDto(
         await this.usersService.createUser(
           user.email,
           user.firstName,
@@ -173,20 +180,47 @@ export class UsersController {
           user.password,
         ),
       );
+    } catch (err) {
+      throw new HttpException(
+        err.message ?? 'Something went wrong',
+        err.status ?? 500,
+      );
+    }
+  }
+
+  @Post('/oidc')
+  @ApiOperation({
+    description: 'creates user',
+  })
+  @ApiResponse({
+    type: UserDto,
+    status: 200,
+  })
+  async createOIDCUser(@Body() user: CreateUserRequest): Promise<UserDto> {
+    try {
+      this.logger.debug(`Create a OIDC user: ${user}`);
 
-      await this.keyCloakService.registerUser({
+      const userExists = await this.keyCloakService.isUserExists({
         email: user.email,
-        firstName: user.firstName,
-        lastName: user.lastName,
-        password: user.password,
       });
 
-      return newUser;
+      if (userExists) {
+        throw new HttpException('User already exists', 409);
+      }
+
+      return new UserDto(
+        await this.keyCloakService.registerUser({
+          email: user.email,
+          firstName: user.firstName,
+          lastName: user.lastName,
+          password: user.password,
+        }),
+      );
     } catch (err) {
-      throw new InternalServerErrorException({
-        error: err.message,
-        location: __filename,
-      });
+      throw new HttpException(
+        err.message ?? 'Something went wrong',
+        err.status ?? 500,
+      );
     }
   }