Looking to insert "www" before the domain name and "http://" in both Spring Boot and JavaScript?

Can someone please explain how to redirect a domain by adding www before the domain name using Spring Boot and JavaScript?

My current URL is: https://example.com/dashboard

I would like it to be: https://www.example.com/dashboard

Answer №1

In my opinion, the configuration for this should be done on the frontend side, such as setting it up with Apache or a proxy server like Nginx.

Answer №2

If you are looking to handle redirection at the web server level rather than within your Spring Boot application, it is recommended to adjust your web server configuration settings. However, if you have a specific reason for needing to implement redirection within your Spring Boot Configuration, you can create a Filter like this:

@Component
public class RedirectionFilter extends GenericFilterBean {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {

        final String host = request.getServerName();
    
        if (!org.apache.commons.lang.StringUtils.startsWithIgnoreCase(host, "www.")) {
            HttpServletRequest httpRequest = (HttpServletRequest) request;
            HttpServletResponse httpResponse = (HttpServletResponse) response;
            
            StringBuffer requestURL = httpRequest.getRequestURL(); // get the full requested URL
            String queryString = httpRequest.getQueryString(); // retrieve query string parameters if present
            
            if (queryString != null) {
                requestURL.append("?").append(queryString); // append query string if available
            }
            
            String redirectURL = requestURL.toString().replace(host, "www." + host); // set up redirect URL by adding 'www' prefix
            httpResponse.sendRedirect(redirectURL); // perform the redirection
        }  else {
            chain.doFilter(request, response); // continue with the filter chain if no redirection needed
        }
    }
}

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