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 ab4900de..443daf83 100644
--- a/src/ng/http.js
+++ b/src/ng/http.js
@@ -892,7 +892,7 @@ 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);
@@ -912,7 +912,7 @@ 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, config.responseType);
       }