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How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
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First off, a "port" is just a number. All a "connection to a port" really represents is a packet which has that number specified in its "destination port" header field.
Now, there are two answers to your question, one for stateful protocols and one for stateless...
Why is there no Constant feature in Java?
...g to identify the reason behind constants in Java
I have learned that Java allows us to declare constants by using final keyword.
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The identity used to sign the executable is no longer valid
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i had to delete all certificates/profiles manually and also refresh everything on the Apple developer portal and download them again, but it worked.
– benka
Oct 30 '13 at 15:36
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In C#, What is a monad?
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Most of what you do in programming all day is combining some functions together to build bigger functions from them. Usually you have not only functions in your toolbox but also other things like operators, variable assignments and the like, but generally your...
How do you diff a directory for only files of a specific type?
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So it looks like -x only accepts one pattern as you report but if you put all the patterns you want to exclude in a file (presumably one per line) you could use the second flag like so:
$ diff /destination/dir/1 /destination/dir/2 -r -X exclude.pats
where exclude.pats is:
*.jpg
*.JPG
*.xml
*.XM...
Salting Your Password: Best Practices?
...d you store. (This is quite a common misunderstanding.)
Use a cryptographically secure random number generator.
Choose a long enough salt. Think about the birthday problem.
There's an excellent answer by Dave Sherohman to another question why you should use randomly generated salts instead of a us...
Can't push to GitHub because of large file which I already deleted
...mand changes the hashes of your commits which can be a real problem, especially on shared repositories. It should not be performed without understanding the consequences.
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Why start an ArrayList with an initial capacity?
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edited Aug 7 '17 at 13:32
answered Mar 15 '13 at 10:47
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Cross-browser custom styling for file upload button [duplicate]
...a file upload button to my personal preferences, but I couldn't find any really solid ways to do this without JS. I did find two other questions about this subject, but the answers there either involved JavaScript, or suggested Quirksmode's approach .
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get dictionary key by value
... value happens to be at the end of the dictionary, it will have to go over all the other values to find it. If you have a number of entries, this will slow your program down.
– Zach Johnson
Mar 14 '10 at 22:41
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