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Why do access tokens expire?

I am just getting started working with Google API and OAuth2. When the client authorizes my app I am given a "refresh token" and a short lived "access token". Now every time the access token expires, I can POST my refresh token to Google and they will give me a new access token. ...
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How to properly import a selfsigned certificate into Java keystore that is available to all Java app

I do want to import a self signed certificate into Java so any Java application that will try to establish a SSL connection will trust this certificate. ...
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Why do I have to access template base class members through the this pointer?

If the classes below were not templates I could simply have x in the derived class. However, with the code below, I have to use this->x . Why? ...
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What do the makefile symbols $@ and $< mean?

What do the $@ and $&lt; do exactly? 6 Answers 6 ...
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How to define an enumerated type (enum) in C?

...t sure what is the proper syntax for using C enums. I have the following code: 13 Answers ...
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Java heap terminology: young, old and permanent generations?

I'm trying to understand What the concepts of young , old and permanent generations are in the Java heap terminology, and more specifically the interactions between the three generations. ...
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When should I mock?

I have a basic understanding of mock and fake objects, but I'm not sure I have a feeling about when/where to use mocking - especially as it would apply to this scenario here . ...
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convert String to DateTime

I need to parse following String into a DateTime Object: 30/Nov/2009:16:29:30 +0100 8 Answers ...
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How to disable Google Chrome auto update?

Does anyone know how to disable Google Chrome for being automatic update itself, it cause my web application always change? ...
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When to use %r instead of %s in Python? [duplicate]

On Learn Python the Hard Way page 21, I see this code example: 4 Answers 4 ...