docs($http): explain why $http may not make the request immediately

I came across this issue today and after researching has found out this thread on so:
http://stackoverflow.com/questions/17039998/angular-not-making-http-requests-immediately.

It took me quite sometimes to figure out this so I hope the addition in documentation could save somebody else some times and frustration.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/ng/http.js b/src/ng/http.js
index 443daf83..ea74f85b 100644
--- a/src/ng/http.js
+++ b/src/ng/http.js
@@ -221,6 +221,10 @@ function $HttpProvider() {
      * will result in the success callback being called. Note that if the response is a redirect,
      * XMLHttpRequest will transparently follow it, meaning that the error callback will not be
      * called for such responses.
+     * 
+     * If your $http is scheduled from something that doesn't cause a $digest to fire then your 
+     * request won't be sent immediately. To make sure a $http request if fired immediately, wrap your
+     * call around with an $scope.$apply(function(){ //make $http request here }
      *
      * # Shortcut methods
      *