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How can I tell if my server is serving GZipped content?

I have a webapp on a NGinx server. I set gzip on in the conf file and now I'm trying to see if it works. YSlow says it's not, but 5 out of 6 websites that do the test say it is. How can I get a definite answer on this and why is there a difference in the results? ...
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How to expand/collapse a diff sections in Vimdiff?

I've started using vimdiff today, and wanted to do some of the things that I've taken for granted on Windows based diff editors (like expand/collapse a diff section, have full file expansion/only diffs with 3 context lines above or below, etc.). I currently know only the following commands : ...
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FTP/SFTP access to an Amazon S3 Bucket [closed]

...o set up). Or you can mount the bucket to a file system on a Linux server and access the files using the SFTP as any other files on the server (which gives you greater control). Or you can just use a (GUI) client that natively supports S3 protocol (what is free). Managed SFTP Service In your...
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What is the basic difference between the Factory and Abstract Factory Design Patterns? [closed]

What is the basic difference between the Factory and Abstract Factory Patterns? 19 Answers ...
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Does SQLAlchemy have an equivalent of Django's get_or_create?

...t Django's implementation of get_or_create. It checks for integrity error, and relies upon proper use of unique constraints. – Ivan Virabyan May 21 '12 at 6:17 1 ...
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How to use Active Support core extensions

I have Active Support 3.0.3 installed and Rails 3.0.3 with Ruby 1.8.7. 5 Answers 5 ...
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Read stream twice

...s.io.IOUtils.copy to copy the contents of the InputStream to a byte array, and then repeatedly read from the byte array using a ByteArrayInputStream. E.g.: ByteArrayOutputStream baos = new ByteArrayOutputStream(); org.apache.commons.io.IOUtils.copy(in, baos); byte[] bytes = baos.toByteArray(); // ...
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Replacing some characters in a string with another character

I have a string like AxxBCyyyDEFzzLMN and I want to replace all the occurrences of x , y , and z with _ . 5 Answers ...
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How can I pipe stderr, and not stdout?

I have a program that writes information to stdout and stderr , and I need to grep through what's coming to stderr , while disregarding stdout . ...
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How to detect if my shell script is running through a pipe?

How do I detect from within a shell script if its standard output is being sent to a terminal or if it's piped to another process? ...