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http HEAD vs GET performance
...EAD might work nicely.
For example, suppose you want to check if resource 123 exists. A 200 means "yes" and a 404 means "no":
HEAD /resources/123 HTTP/1.1
[...]
HTTP/1.1 404 Not Found
[...]
However, if the "yes" or "no" you want from your REST service is a part of the resource itself, rather th...
jQuery Data vs Attr?
...you'll need to use .attr():
HTML:
<a id="foo" href="#" data-color="ABC123"></a>
<a id="bar" href="#" data-color="654321"></a>
JS:
$('#foo').data('color').length; //6
$('#bar').data('color').length; //undefined, length isn't a property of numbers
$('#foo').attr('data-col...
Cannot install Lxml on Mac os x 10.9
...
I solved this issue on Yosemite by both installing and linking libxml2 and libxslt through brew:
brew install libxml2
brew install libxslt
brew link libxml2 --force
brew link libxslt --force
If you have solved the problem using this method but it...
How can I check the system version of Android?
...
Check android.os.Build.VERSION.
CODENAME: The current development codename, or the string "REL" if this is a release build.
INCREMENTAL: The internal value used by the underlying source control to represent this build.
RELEASE:...
How do I perform an insert and return inserted identity with Dapper?
...Username = "lorem ipsum",
Phone = "555-123",
Email = "lorem ipsum"
},
tran);
Return inserted object with ID:
If you wanted you could get Phone and Email or even th...
Strangest language feature
...
Or, more usefully, "0123456789abcdef"[x & 0xf]
– Dipstick
Jan 3 '10 at 15:33
17
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How to redirect output with subprocess in Python?
...
UPDATE: os.system is discouraged, albeit still available in Python 3.
Use os.system:
os.system(my_cmd)
If you really want to use subprocess, here's the solution (mostly lifted from the documentation for subprocess):
p = subpro...
Restoring MySQL database from physical files
Is it possible to restore a MySQL database from the physical database files. I have a directory that has the following file types:
...
What is difference between monolithic and micro kernel?
... kernel can invoke functions directly. Examples of monolithic kernel based OSs: Unix, Linux.
In microkernels, the kernel is broken down into separate processes, known as servers. Some of the servers run in kernel space and some run in user-space. All servers are kept separate and run in different a...
Difference between malloc and calloc?
..., while malloc() leaves the memory uninitialized.
For large allocations, most calloc implementations under mainstream OSes will get known-zeroed pages from the OS (e.g. via POSIX mmap(MAP_ANONYMOUS) or Windows VirtualAlloc) so it doesn't need to write them in user-space. This is how normal malloc ...