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How do popular apps authenticate user requests from their mobile app to their server?

Say I have an Android application that connects to a .Net API for receiving/setting data. The confusion that I have is regarding how to sign-up/login the user first time and authenticate it every time they make a request to the API. ...
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Should Jquery code go in header or footer?

Where is the best place to put Jquery code (or separate Jquery file)? Will pages load faster if I put it in the footer? 9 ...
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Default string initialization: NULL or Empty? [closed]

...s to NULL, with the thinking that NULL means the absence of a value and "" or String.Empty is a valid value. I have seen more examples lately of code where String.Empty is considered the default value or represents no value. This strikes me as odd, with the newly added nullable types in c# it seem...
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Pros and Cons of Interface constants [closed]

...ou can avoid the use of constants by implementing other patterns (strategy or perhaps flyweight), there is something to be said for not needing a half dozen other classes to represent a concept. I think what it boils down to, is how likely is there a need for other constants. In other words, is th...
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Arduino Sketch upload issue - avrdude: stk500_recv(): programmer is not responding

I have an Arduino Duemilanove with an ATmega328 . I am working on Ubuntu 12.04 (Precise Pangolin), and the Arduino IDE's version is 1.0. Recently, I tried to upload a few of the sample sketches onto it, such as the Blink one. However, none of my attempts are working and they result in the same e...
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How to tell if a string is not defined in a Bash shell script

If I want to check for the null string I would do 12 Answers 12 ...
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Constructor function vs Factory functions

Can someone clarify the difference between a constructor function and a factory function in Javascript. 7 Answers ...
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check android application is in foreground or not? [duplicate]

I went through a lot of answers for this question.But it's all about single activity..How to check whether the whole app is running in foreground or not ? ...
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Function vs. Stored Procedure in SQL Server

I've been learning Functions and Stored Procedure for quite a while but I don't know why and when I should use a function or a stored procedure. They look same to me, maybe because I am kinda newbie about that. ...
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Loop through an array of strings in Bash?

...r=("element1" "element2" "element3") ## now loop through the above array for i in "${arr[@]}" do echo "$i" # or do whatever with individual element of the array done # You can access them using echo "${arr[0]}", "${arr[1]}" also Also works for multi-line array declaration declare -a arr=(...