#4 First version for http filter

dmnverifierfrontend/src/main/java/de/unikoblenz/fgbks/dmn/frontend/HttpFilter.java

+package de.unikoblenz.fgbks.dmn.frontend;
+
+import java.io.IOException;
+import java.net.URI;
+import javax.ws.rs.container.ContainerRequestContext;
+import javax.ws.rs.container.ContainerRequestFilter;
+import javax.ws.rs.container.PreMatching;
+import javax.ws.rs.core.MultivaluedMap;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.UriInfo;
+import javax.ws.rs.ext.Provider;
+
+@Provider
+@PreMatching
+public class HttpFilter implements ContainerRequestFilter {
+
+  @Override
+  public void filter(ContainerRequestContext reqContext) throws IOException {
+    System.out.println("-- request info --");
+    UriInfo uriInfo = reqContext.getUriInfo();
+    System.out.println(uriInfo.getRequestUri().toString());
+    System.out.println(reqContext.getMethod());
+    log(uriInfo, reqContext.getHeaders());
+
+    reqContext.abortWith(Response.noContent().build());
+    reqContext.setRequestUri(URI.create("/index.html"));
+
+    System.out.println("-- request info --");
+    uriInfo = reqContext.getUriInfo();
+    System.out.println(uriInfo.getRequestUri().toString());
+    System.out.println(reqContext.getMethod());
+    log(uriInfo, reqContext.getHeaders());
+  }
+
+  private void log(UriInfo uriInfo, MultivaluedMap<String, ?> headers) {
+    System.out.println("Path: " + uriInfo.getPath());
+    System.out.println("HEADERS:");
+    headers.entrySet().forEach(h -> System.out.println(h.getKey() + ": " + h.getValue()));
+  }
+}