Implements null body for specific status codes per HTTP spec.

- Null body is now used for status codes 101, 204, 205, and 304.
- See jpillora#116 (comment)

dist/xhook.js

@@ -1,7 +1,7 @@
 // XHook - v1.4.9 - https://github.com/jpillora/xhook
-// Jaime Pillora <[email protected]> - MIT Copyright 2018
-(function(undefined) {
-var AFTER, BEFORE, COMMON_EVENTS, EventEmitter, FETCH, FIRE, FormData, NativeFetch, NativeFormData, NativeXMLHttp, OFF, ON, READY_STATE, UPLOAD_EVENTS, WINDOW, XHookFetchRequest, XHookFormData, XHookHttpRequest, XMLHTTP, convertHeaders, depricatedProp, document, fakeEvent, mergeObjects, msie, nullify, proxyEvents, slice, useragent, xhook, _base,
+// Jaime Pillora <[email protected]> - MIT Copyright 2020
+(function(window,undefined) {
+var AFTER, BEFORE, BODYLESS_STATUS_CODES, COMMON_EVENTS, EventEmitter, FETCH, FIRE, FormData, NativeFetch, NativeFormData, NativeXMLHttp, OFF, ON, READY_STATE, UPLOAD_EVENTS, WINDOW, XHookFetchRequest, XHookFormData, XHookHttpRequest, XMLHTTP, convertHeaders, depricatedProp, document, fakeEvent, mergeObjects, msie, nullify, proxyEvents, slice, useragent, xhook, _base,
   __indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };
 
 WINDOW = null;
@@ -38,6 +38,8 @@ UPLOAD_EVENTS = ['load', 'loadend', 'loadstart'];
 
 COMMON_EVENTS = ['progress', 'abort', 'error', 'timeout'];
 
+BODYLESS_STATUS_CODES = [101, 204, 205, 304];
+
 useragent = typeof navigator !== 'undefined' && navigator['useragent'] ? navigator.userAgent : '';
 
 msie = parseInt((/msie (\d+)/.exec(useragent.toLowerCase()) || [])[1]);
@@ -640,9 +642,10 @@ if (typeof WINDOW[FETCH] === "function") {
         }
       };
       done = function(userResponse) {
-        var response;
+        var body, response;
         if (userResponse !== void 0) {
-          response = new Response(userResponse.body || userResponse.text, userResponse);
+          body = BODYLESS_STATUS_CODES.includes(userResponse.status) ? null : userResponse.body || userResponse.text;
+          response = new Response(body, userResponse);
           resolve(response);
           processAfter(response);
           return;
@@ -697,4 +700,4 @@ if (typeof define === "function" && define.amd) {
   WINDOW.xhook = xhook;
 }
 
-}.call(this));
+}.call(this,window));