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How to force a web browser NOT to cache images
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Simple fix: Attach a random query string to the image:
<img src="foo.cgi?random=323527528432525.24234" alt="">
What the HTTP RFC says:
Cache-Control: no-cache
But that doesn't work that well :)
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How to avoid the “divide by zero” error in SQL?
...ught it would be an error). So... I went with the following: ISNULL( (SUM(foo) / NULLIF(SUM(bar),0) ), 0) AS Avg
– Andrew Steitz
Mar 1 '13 at 20:45
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Turn a string into a valid filename?
... use list comprehension together with the string methods.
>>> s
'foo-bar#baz?qux@127/\\9]'
>>> "".join(x for x in s if x.isalnum())
'foobarbazqux1279'
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How can I check if a Perl array contains a particular value?
...ine array doing below, will work as above.
if ( $var ~~ ['bar', 'value', 'foo'] )
In Perl 5.18 smartmatch is flagged as experimental therefore you need to turn off the warnings by turning on experimental pragma by adding below to your script/module:
use experimental 'smartmatch';
Alternativel...
How can I remove the string “\n” from within a Ruby string?
... use String#delete (or its mutator equivalent String#delete!), e.g.:
x = "foo\nfoo"
x.delete!("\n")
x now equals "foofoo"
In this specific case String#delete is more readable than gsub since you are not actually replacing the string with anything.
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How do you pass custom environment variable on Amazon Elastic Beanstalk (AWS EBS)?
...I to set environment variables.
To set an environment variable: eb setenv FOO=bar
To view the environment variables: eb printenv
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How do you create a REST client for Java? [closed]
...st:8080");
// lets get the XML as a String
String text = resource("foo").accept("application/xml").get(String.class);
BTW I hope that future version of JAX-RS add a nice client side API along the lines of the one in Jersey
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How to convert a PIL Image into a numpy array?
...to a numpy array this way:
import numpy
import PIL
img = PIL.Image.open("foo.jpg").convert("L")
imgarr = numpy.array(img)
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What can , and be used for?
...so that it's available by #{id} in the view.
So when you open the page as foo.xhtml?id=10 then the parameter value 10 get set in the bean this way, right before the view is rendered.
As to validation, the following example sets the param to required="true" and allows only values between 10 and 20. ...
How to write lists inside a markdown table?
... I'm happy to confirm that the first one (embedded <ul><li>foo</li></ul>) also works on Bitbucket Server.
– nwinkler
Dec 9 '16 at 15:27
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