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How does this checkbox recaptcha work and how can I use it?
...CHA”
Google reCAPTCHA: Introducing the new reCAPTCHA!
This is a JavaScript based CAPTCHA.
Since most spambots do not execute JavaScript and can not identify the correlation between the displayed text and the DOM or required actions they can not click on the checkbox.
Please note that there is ...
Is “IF” expensive?
...fs are expensive. In order to understand why, you have to understand how pipelines work.
The current instruction to be executed is stored in something typically called the instruction pointer (IP) or program counter (PC); these terms are synonymous, but different terms are used with different arch...
Set cURL to use local virtual hosts
...ing
where project1.loc is just the host name and 127.0.0.1 is the target IP address.
(If you're using curl from a library and not on the command line, make sure you don't put http:// in the Host header.)
share
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How to explore web-based Google Play in another country?
...uay
https://play.google.com/?gl=pe Peru
https://play.google.com/?gl=ph Philippines
https://play.google.com/?gl=pl Poland
https://play.google.com/?gl=pt Portugal
https://play.google.com/?gl=qa Qatar
https://play.google.com/?gl=ro Romania
https://play.google.com/?gl=ru Russia
https://play.google.com/?...
Prevent direct access to a php include file
...e.Hunter: this is about blocking access to viewing your include/library script files directly, the answer works. If they created somefile.php on your server and added your define in it, that still doesn't let them directly access the include file. It will let them "include" your library files, but i...
Loading cross-domain endpoint with AJAX
... I can't get a response. However using jsonp the browser is expecting a script mime type but is receiving "text/html".
9 An...
How to make Java honor the DNS Caching Timeout?
...d domain name. Through some DNS magic, the domain name is resolved into an IP that's closest to the server with least load. For the load-balancing to work, the application server needs to honor the TTL from DNS response and to resolve the domain name again when cache times out. However, I couldn't f...
How unique is UUID?
...ead.
Source: The Random UUID probability of duplicates section of the Wikipedia article on Universally unique identifiers (link leads to a revision from December 2016 before editing reworked the section).
Also see the current section on the same subject on the same Universally unique identifier a...
HashMap get/put complexity
...could have a hash which takes a long time to compute, and if there are multiple items in the hash map which return the same hash code, get will have to iterate over them calling equals on each of them to find a match.
In the worst case, a HashMap has an O(n) lookup due to walking through all entrie...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注IT技能提升
...它后面所定义的命令将不会被自动执行，不过，我们可以显示要make执行。即命令——“make clean”，以此来清除所有的目标文件，以便重编译。
于是在我们编程中，如果这个工程已被编译过了，当我们修改了其中一个源文...