Spring Boot, Spring Security specify redirect login url - spring

Question

At my Spring Boot application I need to implement a following scenario:
Anonymous User visits the following page: http://example.com/product-a.html
This User wants to ask a question about this product. It can be done at another page, located by the following address: http://example.com/product-a/ask. User press Ask Question button at the http://example.com/product-a.html and login/registration popup is shown. After successful login User should be automatically redirected to http://example.com/product-a/ask (but currently with a default Spring Security implementation User are redirecting back to the page originator http://example.com/product-a.html)
How to properly with Spring Boot/Spring Security implement/configure this redirect ?
UPDATED
This is my web security config:
#Override
protected void configure(HttpSecurity http) throws Exception {
// #formatter:off
http.addFilterBefore(new CorsFilter(), ChannelProcessingFilter.class);
http
.csrf().ignoringAntMatchers("/v1.0/**", "/logout")
.and()
.authorizeRequests()
.antMatchers("/oauth/authorize").authenticated()
//Anyone can access the urls
.antMatchers("/images/**").permitAll()
.antMatchers("/signin/**").permitAll()
.antMatchers("/v1.0/**").permitAll()
.antMatchers("/auth/**").permitAll()
.antMatchers("/actuator/health").permitAll()
.antMatchers("/actuator/**").hasAuthority(Permission.READ_ACTUATOR_DATA)
.antMatchers("/login").permitAll()
.anyRequest().authenticated()
.and()
.formLogin()
.loginPage("/login")
.loginProcessingUrl("/login")
.failureUrl("/login?error=true")
.usernameParameter("username")
.passwordParameter("password")
.permitAll()
.and()
.logout()
.logoutUrl("/logout")
.logoutSuccessUrl(logoutSuccessUrl)
.permitAll();
// #formatter:on
}
I use OAuth2/JWT + Implicit Flow for AngularJS client

Answer 1

I think you should not use spring's default /login processing url, but create your own e.g /mylogin in a controller. And then you can inject the HttpServletRequest in the method and take the action based on the context of the request for example:
#PostMapping("/mylogin")
public ResponseEntity<> processingLogingURL(HttpServletRequest request){
// switch bases on the request URL after checking security off course
switch(request.getRequestURL()){
//redirect based on the caller URL
}
}
and finally change your .loginProcessingUrl("/login") to .loginProcessingUrl("/mylogin")