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浅谈Heatmap：网页热点图生成原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是因为有的情况下需要修正点击坐标。比如说，一个居中显示的定宽的页面，其同一个位置在不同分辨率下的坐标是不同的，当渲染图片的时候，坐标需要以一个分辨率为准进行修正。
另外，如果用户正在拖动滚动条，是不应...
Maximum on http header values?
...y to define the custom max size of the header ?
– Sudip Bolakhe
Apr 30 '19 at 9:52
1
Be aware of ...
How to pass a user defined argument in scrapy spider
...o pass arguments to run on scrapyd replace -a with -d
curl http://your.ip.address.here:port/schedule.json -d
spider=myspider -d category='mycategory' -d domain='example.com'
The spider will receive arguments in its constructor.
class MySpider(Spider):
name="myspider"
def __init__...
Which $_SERVER variables are safe?
...hould be rejected by the web server and not cause the invocation of the script to begin with. Hence they can be considered reliable.
'HTTPS'
'REQUEST_TIME'
'REMOTE_ADDR' *
'REMOTE_HOST' *
'REMOTE_PORT' *
'SERVER_PROTOCOL'
'HTTP_HOST' †
'SERVER_NAME' †
'SCRIPT_FILENAME'
'SERVER_PORT' ‡
'SCRIP...
Chrome DevTools Devices does not detect device when plugged in
...ools for your platform. I'm using Windows, and the steps for me were:
-Unzip the download into c:\platform-tools (I just put it here for
convenience, you can choose a different location).
-Open command prompt (run as administrator) in folder, and run the
following command:
adb devices
(Th...
Django connection to PostgreSQL: “Peer authentication failed”
...ets. On the other hand, when the HOST is "localhost", it connects via TCP/IP to 127.0.0.1. Likely, your pg_hba.conf is set up to deny ordinary users from connecting through UNIX sockets but allows them over TCP/IP from localhost.
– Jim Garrison
May 1 '13 at 1...
如何编写一个独立的 PHP 扩展（译） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...境下才能使用的工具。
改装一个已经存在的扩展
为了显示出创建一个独立的扩展是很容易的事情，我们先将一个已经内嵌到 PHP 的扩展改成独立扩展。安装 PHP 并且执行以下命令：
$ mkdir /tmp/newext
$ cd /tmp/newext
现在你已...
What are sessions? How do they work?
...crypted and stored in a cookie. This greatly simplifies scaling out to multiple nodes as the servers don't need to 'remember' anything.
– Matt Harrison
Jan 30 '15 at 20:56
...
Change key pair for ec2 instance
...ts on boxes you've been connecting from.
– brandonscript
Apr 9 '14 at 6:38
22
...
How to send data to local clipboard from a remote SSH session
Borderline ServerFault question, but I'm programming some shell scripts, so I'm trying here first :)
11 Answers
...