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Why does a base64 encoded string have an = sign at the end

I know what base64 encoding is and how to calculate base64 encoding in C#, however I have seen several times that when I convert a string into base64, there is an = at the end. ...
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Mysql: Select rows from a table that are not in another

How to select all rows in one table that do not appear on another? 8 Answers 8 ...
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How to avoid reverse engineering of an APK file?

I am developing a payment processing app for Android, and I want to prevent a hacker from accessing any resources, assets or source code from the APK file. ...
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WebSockets vs. Server-Sent events/EventSource

Both WebSockets and Server-Sent Events are capable of pushing data to browsers. To me they seem to be competing technologies. What is the difference between them? When would you choose one over the other? ...
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Weird Integer boxing in Java

I just saw code similar to this: 10 Answers 10 ...
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Storing JSON in database vs. having a new column for each key

I am implementing the following model for storing user related data in my table - I have 2 columns - uid (primary key) and a meta column which stores other data about the user in JSON format. ...
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How to re import an updated package while in Python Interpreter? [duplicate]

I often test my module in the Python Interpreter, and when I see an error, I quickly update the .py file. But how do I make it reflect on the Interpreter ? So, far I have been exiting and reentering the Interpreter because re importing the file again is not working for me. ...
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How to rename a file using Python

I want to change a.txt to b.kml . 11 Answers 11 ...
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What guidelines for HTML email design are there? [closed]

What guidelines can you give for rich HTML formatting in emails while maintaining good visual stability across many clients and web based email interfaces? ...
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Error: Can't set headers after they are sent to the client

I'm fairly new to Node.js and I am having some issues. 32 Answers 32 ...