code: @GET
      public Response getImage(@PathParam("etsCode") String etsCode,
              @PathParam("etsVersion") String etsVersion,
              @PathParam("image") String image) {
          StringBuilder imgClassPath = new StringBuilder("/doc/");
          imgClassPath.append(etsCode).append("/").append(etsVersion)
                  .append("/resources/").append(image);
          InputStream imgStream = this.getClass().getResourceAsStream(
                  imgClassPath.toString());
          if (null == imgStream) {
              ErrorResponseBuilder builder = new ErrorResponseBuilder();
              Response rsp = builder.buildErrorResponse(404,
                      "Image resource not found.");
              throw new WebApplicationException(rsp);
          }
          return Response.ok(imgStream, "image/png").build();
      }
docs: Returns an image resource from this classpath location:
  <code>/doc/{etsCode}/{etsVersion}/resources/{image}</code>
  
  @param etsCode
  The test suite code.
  @param etsVersion
  The test suite version.
  @param image
  The name of the image resource (e.g. figure-1.png).
  @return An InputStream for reading the image resource from the classpath.