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CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...；在此过程中，使用的全局负载均衡DNS解析，如根据地理位置信息解析对应的IP地址，使得用户能就近访问。
3)、此次解析得到CDN缓存服务器的IP地址，浏览器在得到实际的IP地址以后，向缓存服务器发出访问请求；
4)...
Can dplyr package be used for conditional mutating?
...x) sample(7, 1e7, TRUE)))
setnames(DT, letters[1:6])
# > dim(DT)
# [1] 10000000 6
DF <- as.data.frame(DT)
DT_fun <- function(DT) {
DT[(a %in% c(0,1,3,4) | c == 4), g := 3L]
DT[a %in% c(2,5,7) | (a==1 & b==4), g := 2L]
}
DPLYR_fun <- function(DF) {
mutate(DF, g =...
Visual Studio SP1 error: silverlight_sdk.msi is unavailable
...ng on the installation, you may need the MSI file of the "WCF RIA Services v1.0 SP1". You can download it from WCF RIA Services V1.0 SP1 for Silverlight 4.
And then you can again point it to your error message.
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Export database schema into SQL file
...DENTITY(1,1)
,DatabaseName VARCHAR(100)
,TableOwner VARCHAR(100)
,TableName VARCHAR(100)
,FieldName VARCHAR(100)
...
How do you merge two Git repositories?
...of June 2013): stackoverflow.com/a/11613541/694469 (and I replaced git co v1.7.11.3 with ... v1.8.3).
– KajMagnus
Jun 7 '13 at 14:31
1
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How do BitTorrent magnet links work?
...
+100
Peer discovery and resource discovery (files in your case) are two different things.
I am more familiar with JXTA but all peer to p...
Null coalescing in powershell
...ssignment, and ternary operators in Powershell.
Null Coalescing
$null ?? 100 # Result is 100
"Evaluated" ?? (Expensive-Operation "Not Evaluated") # Right side here is not evaluated
Null Conditional Assignment
$x = $null
$x ??= 100 # $x is now 100
$x ??= 200 # $x remains 100
Terna...
Should you always favor xrange() over range()?
...ge() if you actually want a list of numbers.
multiples_of_seven = range(7,100,7)
print "Multiples of seven < 100: ", multiples_of_seven
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fol...
EF Code First foreign key without navigation property
...ho wants to achieve the same thing using Entity Framework Core (I am using V1.1.2).
I don't need navigation properties (although they're nice) because I am practicing DDD and I want Parent and Child to be two separate aggregate roots. I want them to be able to talk to each other via foreign key not...
json_encode() escaping forward slashes
...ual to a url that was json_encoded -
my expected:
http://localhost/api/v1/admin/logs/testLog.log
would be encoded to:
http:\/\/localhost\/api\/v1\/admin\/logs\/testLog.log
If you need to do a comparison, transforming the url using:
addcslashes($url, '/')
allowed for the proper output durin...