Grizzly Static Server SPA support

StaticFileConfiguration.java

  @Bean
    public RegisterableHttpHandler staticHttpHandler(GrizzlyProperties properties) {
        File webDirectory = new File("web");
        StaticHttpHandler httpHandler = new StaticHttpHandler(webDirectory.getAbsolutePath()) {

            // Serve index.html for non-existent files (for SPA routing support)
            @Override
            public void service(final Request request, final Response response)
                    throws Exception {
                final String uri = getRelativeURI(request);

                if (uri == null || !handle(uri, request, response)) {

                    if (isUriAFile(uri)) {
                        onMissingResource(request, response);
                    } else {
                        serveIndexHtml(response);
                    }
                }
            }

            private void serveIndexHtml(final Response response) throws IOException {
                File indexFile = new File(webDirectory, "index.html");
                response.setContentType("text/html");
                sendFile(response, indexFile);
            }

            private boolean isUriAFile(String uri) {
                URI uriObj = URI.create(uri);
                String path = uriObj.getPath();
                int lastSlashIndex = path.lastIndexOf('/');
                String lastSegment = path.substring(lastSlashIndex + 1);

                // Consider it a file if there's a dot in the last segment, excluding cases where the dot is the first character
                return lastSegment.contains(".") && !lastSegment.startsWith(".");
            }
        };
        httpHandler.setFileCacheEnabled(false); // Disable cache because it's very very slow
        return new RegisterableHttpHandler(httpHandler, new HttpHandlerRegistration[]{
            HttpHandlerRegistration.fromString("/web/*"),});

    }