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What is the boundary in multipart/form-data?

I want to ask a question about the multipart/form-data . In the HTTP header, I find that the Content-Type: multipart/form-data; boundary=??? . ...
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What is a Context Free Grammar?

...e explain to me what a context free grammar is? After looking at the Wikipedia entry and then the Wikipedia entry on formal grammar, I am left utterly and totally befuddled. Would someone be so kind as to explain what these things are? ...
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What are the differences between poll and select?

I am referring to the POSIX standard select and poll system C API calls. 3 Answers ...
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Resize svg when window is resized in d3.js

I'm drawing a scatterplot with d3.js. With the help of this question : Get the size of the screen, current web page and browser window ...
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Constructor overloading in Java - best practice

There are a few topics similar to this, but I couldn't find one with a sufficient answer. 6 Answers ...
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What are “Groovy” and “Grails” and what kinds of applications are built using them?

Nowadays I hear a lot about "Groovy on Grails" and I want to know more about it: 4 Answers ...
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Are lists thread-safe?

I notice that it is often suggested to use queues with multiple threads, instead of lists and .pop() . Is this because lists are not thread-safe, or for some other reason? ...
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Is git-svn dcommit after merging in git dangerous?

My motivation for trying out git-svn is the effortless merging and branching. Then I noticed that man git-svn(1) says: 6 A...
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Common MySQL fields and their appropriate data types

I am setting up a very small MySQL database that stores, first name, last name, email and phone number and am struggling to find the 'perfect' datatype for each field. I know there is no such thing as a perfect answer, but there must be some sort of common convention for commonly used fields such as...
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In Matlab, when is it optimal to use bsxfun?

My Question: I've noticed that a lot of good answers to Matlab questions on SO frequently use the function bsxfun . Why? ...