How to add a new request header to all the existing APIs in the application using spring boot

For future travellers: I solved this by creating custom filter. When some other filter stops the filter chain, for some reason (like authorization check etc.) the request might not reach the HandlerInterceptor. Filter solves this.

Create the component:

@Component class VersionFilter() : OncePerRequestFilter() { override fun doFilterInternal(request: HttpServletRequest, response: HttpServletResponse, filterChain: FilterChain) { response.addHeader("X-Tolgee-Version", VersionProvider.version) filterChain.doFilter(request, response) } } 

And register it in WebSecurityConfig:

@Configuration class WebSecurityConfig @Autowired constructor( ... private val versionFilter: VersionFilter, ) : WebSecurityConfigurerAdapter() { override fun configure(http: HttpSecurity) { http .csrf().disable().cors().and().headers().frameOptions().sameOrigin().and() .addFilterBefore(versionFilter, UsernamePasswordAuthenticationFilter::class.java) ... .and() return } } 

Yes you can write an interceptor for every request at root level and append your headers to that request.You can use prehandle as

• This is used to perform operations before sending the request to the controller.

Below is the code snippet

 @Component public class ProductServiceInterceptor implements HandlerInterceptor { @Override public boolean preHandle( HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { return true; } @Override public void postHandle( HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {} @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception exception) throws Exception {} }