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CORS - What is the motivation behind introducing preflight requests?
Cross-origin resource sharing is a mechanism that allows a web page to make XMLHttpRequests to another domain (from wikipedia ).
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Hidden features of mod_rewrite
...s the rules are processed once, as opposed to each time the .htaccess file is called).
Logging mod_rewrite requests
Logging may be enabled from within the httpd.conf file (including <Virtual Host>):
# logs can't be enabled from .htaccess
# loglevel > 2 is really spammy!
RewriteLog /path/...
“static const” vs “#define” vs “enum”
Which one is better to use among the below statements in C?
17 Answers
17
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Conditionally start at different places in storyboard from AppDelegate
... storyboard set up with working login and main view controller, the latter is the view controller to which the user is navigated to when login is successful.
My objective is to show the main view controller immediately if the authentication (stored in keychain) is successful, and show the login view...
Storing JSON in database vs. having a new column for each key
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Updated 4 June 2017
Given that this question/answer have gained some popularity, I figured it was worth an update.
When this question was originally posted, MySQL had no support for JSON data types and the support in PostgreSQL was in its infancy. Since 5.7...
Django auto_now and auto_now_add
...the auto_now and auto_now_add arguments go away, and although they still exist, I feel you're better off just using a custom save() method.
So, to make this work properly, I would recommend not using auto_now or auto_now_add and instead define your own save() method to make sure that created is on...
What is @ModelAttribute in Spring MVC?
What is the purpose and usage of @ModelAttribute in Spring MVC?
13 Answers
13
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What is a columnar database?
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How do Columnar Databases work?
Columnar database is a concept rather a particular architecture/implementation. In other words, there isn't one particular description on how these databases work; indeed, several are build upon traditional, row-oriented, DBMS, simply storing...
Why does Unicorn need to be deployed together with Nginx?
...ow the difference between Nginx and Unicorn. As far as I understand, Nginx is a web server while Unicorn is a Ruby HTTP server.
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What is the difference between DSA and RSA?
...e public exponent (e)
for anyone to verify the signature. Everything else is identical.
DSA (Digital Signature Algorithm)
DSA is a variant on the ElGamal and Schnorr algorithms
creates a 320 bit signature, but with 512-1024 bit security
security again rests on difficulty of computing discrete...