fix($http): allow empty responses to be cached

Closes #3809

1 files changed, 2 insertions, 2 deletions

diff --git a/src/ng/http.js b/src/ng/http.js
index 40ebfca2..85068ff6 100644
--- a/src/ng/http.js
+++ b/src/ng/http.js
@@ -706,7 +706,7 @@ function $HttpProvider() {
 
       if (cache) {
         cachedResp = cache.get(url);
-        if (cachedResp) {
+        if (isDefined(cachedResp)) {
           if (cachedResp.then) {
             // cached request has already been sent, but there is no response yet
             cachedResp.then(removePendingReq, removePendingReq);
@@ -726,7 +726,7 @@ function $HttpProvider() {
       }
 
       // if we won't have the response in cache, send the request to the backend
-      if (!cachedResp) {
+      if (isUndefined(cachedResp)) {
         $httpBackend(config.method, url, reqData, done, reqHeaders, config.timeout,
             config.withCredentials);
       }