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How does facebook, gmail send the real time notification?
...n a given interval (perhaps every few seconds), to check if something has happened. However, this can be pretty network intensive, and you often make pointless requests, because nothing has happened.
The way Facebook does it is using the comet approach, rather than polling on an interval, as soon a...
How do I break a string over multiple lines?
...ut which will be rendered as a string
with only a single carriage return appended to the end.
http://symfony.com/doc/current/components/yaml/yaml_format.html
You can use the "block chomping indicator" to eliminate the trailing line break, as follows:
Key: >-
This is a very long sentence
...
How do I implement basic “Long Polling”?
...ritten in any language (I chose Apache/PHP as they are very common, and I happened to be running them locally)
Then, in Javascript, you request the above file (msg_srv.php), and wait for a response. When you get one, you act upon the data. Then you request the file and wait again, act upon the dat...
Possible reason for NGINX 499 error codes
...
As a special case, I noticed it sometimes happen when the end-user double-clicks a form submit button. The form is sent twice, but only one response is expected by the client. This can be worked around by disabling (at least for a few seconds) buttons in JS the first ...
What are the differences between django-tastypie and djangorestframework? [closed]
Why would you use one over the other, for exposing an API for your Django app?
7 Answers
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Java: Class.this
...Am I right? (This is how the minified code is in the OSX Kindle Previewer app's .jar files, I'm just trying to understand what I'm looking at.)
– Matt Mc
Apr 29 '15 at 5:48
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Hand Coded GUI Versus Qt Designer GUI [closed]
I'm spending these holidays learning to write Qt applications. I was reading about Qt Designer just a few hours ago, which made me wonder : what do people writing real world applications in Qt use to design their GUIs? In fact, how do people design GUIs in general?
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When is a C++ destructor called?
...te an item in the (previously) unused part of its memory space.
Now, what happens when/if you erase an item from the vector? It can't just use delete -- that would release its entire block of memory; it needs to destroy one object in that memory without destroying any others, or releasing any of the...
Why does CSS not support negative padding?
...it the CSS of all children of a container. You might have generic CSS that applies to these elements across the document, and you don't want to change it for the contents of a particular container, for example.
– Rolf
Nov 3 '11 at 10:57
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When do Java generics require
...ally instantiated via reflection and used based on the key. (A distributed app where the client doesn't have the server classes available, just the key of which class to use to do the server side work).
– Yishai
May 22 '09 at 14:21
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