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X-Frame-Options Allow-From multiple domains
...use it in old or new projects. Pages or Web apps using it may break at any time.
The modern alternative is the Content-Security-Policy header, which along many other policies can white-list what URLs are allowed to host your page in a frame, using the frame-ancestors directive.
frame-ancestors sup...
The performance impact of using instanceof in Java
...th wrote, "We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil." The performance of instanceof probably won't be an issue, so don't waste your time coming up with exotic workarounds until you're sure that's the problem.
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Unit testing Anti-patterns catalogue
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Yeah, that's my favorite one. I do it all the time. Oh... wait... you said that this was a bad thing. :-)
– guidoism
Sep 10 '10 at 22:37
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What is “overhead”?
...e worth it if you were going across the country.
In computer science, sometimes we use cars to go down the street because we don't have a better way, or it's not worth our time to "learn how to walk".
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ADB Shell Input Events
... Just for extra information. Swipe only worked on my phone if the time was larger than 120!! adb shell input swipe 200 800 200 400 200
– Jose Rodrigues
Nov 16 '18 at 12:56
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How do I include a file over 2 directories back?
...rectory
So ../ gets you one directory back not two.
Chain ../ as many times as necessary to go up 2 or more levels.
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Android AsyncTask threads limits?
I am developing an application where I need to update some info every time user logs in to the system, I also use database in the phone. For all those operations (updates, retrieving data from db and etc.) I use async tasks. As up till now I didn't see why I shouldn't use them, but recently I experi...
STL or Qt containers?
...ndard" by using stl containers. And whats the point of a container if everytime you want to use it for anything useful, you have to copy it out into the corresponding Qt container?
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Difference between TCP and UDP?
...e efficient than TCP because it uses non ACK. It's generally used for real time communication, where a little percentage of packet loss rate is preferable to the overhead of a TCP connection.
In certain situations UDP is used because it allows broadcast packet transmission. This is sometimes funda...
Is List a subclass of List? Why are Java generics not implicitly polymorphic?
... @ruakh: The problem is that you're then punting to execution time something which can be blocked at compile-time. And I'd argue that array covariance was a design mistake to start with.
– Jon Skeet
Jul 3 '13 at 17:22
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