A list of HttpInterceptors.

class HttpInterceptors {
 List<HttpInterceptor> _interceptors = [new DefaultTransformDataHttpInterceptor()];

 add(HttpInterceptor x) => _interceptors.add(x);
 addAll(List<HttpInterceptor> x) => _interceptors.addAll(x);

 /**
  * Called from [Http] to construct a [Future] chain.
  */
 constructChain(List chain) {
   _interceptors.reversed.forEach((HttpInterceptor i) {
     // AngularJS has an optimization of not including null interceptors.
     chain.insert(0, [
         i.request == null ? (x) => x : i.request,
         i.requestError]);
     chain.add([
         i.response == null ? (x) => x : i.response,
         i.responseError]);
   });
 }

/**
  * Default constructor.
  */
 HttpInterceptors() {
   _interceptors = [new DefaultTransformDataHttpInterceptor()];
 }

 /**
  * Creates a [HttpInterceptors] from a [List].  Does not include the default interceptors.
  */
 HttpInterceptors.of([List interceptors]) {
   _interceptors = interceptors;
 }
}