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Getting an empty JQuery object

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What is the appropriate HTTP status code response for a general unsuccessful request (not an error)?

...rmation you send in the body. From RESTful Web Services Cookbook: One common mistake that some web services make is to return a status code that reflects success (status codes from 200 to 206 and from 300 to 307) but include a message body that describes an error condition. Doing this pre...
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Reading header data in Ruby on Rails

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NOT IN vs NOT EXISTS

...plan may vary but for my example data I get the following. A reasonably common misconception seems to be that correlated sub queries are always "bad" compared to joins. They certainly can be when they force a nested loops plan (sub query evaluated row by row) but this plan includes an anti semi ...
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Does “git fetch --tags” include “git fetch”?

... git fetch --tags fetches tags in addition to what are fetched by the same command line without the option. See commit c5a84e9 by Michael Haggerty (mhagger): Previously, fetch's "--tags" option was considered equivalent to specifying the refspec refs/tags/*:refs/tags/* on the command ...
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What is the difference between a weak reference and an unowned reference?

... provide this benefit). A weak reference allows the possibility of it to become nil (this happens automatically when the referenced object is deallocated), therefore the type of your property must be optional - so you, as a programmer, are obligated to check it before you use it (basically the compi...
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How do I embed a single file from a GitHub gist with the new gist interface?

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create two method for same url pattern with different arguments

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java.net.UnknownHostException: Invalid hostname for server: local

... Try the following : String url = "http://www.google.com/search?q=java"; URL urlObj = (URL)new URL(url.trim()); HttpURLConnection httpConn = (HttpURLConnection)urlObj.openConnection(); httpConn.setRequestMethod("GET"); Integer rescode = httpConn.getResponseCode(); S...
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Why is Go so slow (compared to Java)?

As we could see from The Computer Language Benchmarks Game in 2010: 10 Answers 10 ...