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GO1.8
NET/HTTP
TIMEOUTS
2017-03-25 Tetsuya Morimoto
ABOUT ME
Tetsuya Morimoto
twitter: @t2y
I like Python, Java and Go!
Yahoo Japan Corporation
Data & Science Solutions Group
Apprentice Infrastructure engineer
Mission: OPS → SRE
RECENT WORK
Qiita
[ ] (SRE)
Go 1.8 Graceful Shutdown
Python
3/21
3/18
1/27
GO 1.8 FEATURE
MINOR CHANGES
Go 1.8 net/http changes from release note
“The Server adds configuration options
ReadHeaderTimeout and IdleTimeout and
documentsWriteTimeout. ”
NOTABLE ARTICLES
https://blog.cloudflare.com/
The complete guide to Go net/http timeouts
So you want to expose Go on the Internet
Written by @FiloSottile (FilippoValsorda)
“ Back when crypto/tls was slow and net/http young,
the general wisdom was to always put Go servers
behind a reverse proxy like NGINX.
That's not necessary anymore! ”
STUDY TIMEOUTS
SOCKETTIMEOUTS
net.Conn interface
SetDeadline (SetReadDeadline/SetWriteDeadline)
I/O operation with timeout
Let’s Socket Programming!
Socket is an API working on transport layer
Go TCP
Go TCP
socket
bind
listen
accept
Conn
Transport Layer
HTTP SERVERTIMEOUTS Application Layer
Go1.8
Go1.7
new!
ReadHeaderTimeout
These images are quoted from Filippo’s article on https://blog.cloudflare.com
HTTP SERVERTIMEOUTS
net/http: no way of manipulating timeouts in Handler #16100
issued at 2016-06-18 (Go 1.6.x)
Go 1.8 introduces ReadHeaderTimeout
Reset read deadline after reading the request header
Application Layer
“ Go 1.8 introduces ReadHeaderTimeout,
which only covers up to the request headers.
However, there's still no clear way to do reads
with timeouts from a Handler. ”
HTTP CLIENTTIMEOUTS Application Layer
This image is quoted from Filippo’s article on https://blog.cloudflare.com
“ Client-side timeouts can be simpler or much more complex, … ”
CONTEXT PACKAGE
context is standard way
the advantage
a request will cancel if
parent context would
cancel
ctx, cancel := context.WithCancel(context.TODO())
timer := time.AfterFunc(5*time.Second, func() {
cancel()
})
req, err := http.NewRequest("GET",“http://
example.com”, nil)
if err != nil {
log.Fatal(err)
}
req = req.WithContext(ctx)
SUMMARY
Timeouts is important for effective/stable Web service.
including against malicious attack (DoS/DDoS)
Go 1.8 http.Server is enough stable!

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go 1.8 net/http timeouts

  • 2. ABOUT ME Tetsuya Morimoto twitter: @t2y I like Python, Java and Go! Yahoo Japan Corporation Data & Science Solutions Group Apprentice Infrastructure engineer Mission: OPS → SRE
  • 3. RECENT WORK Qiita [ ] (SRE) Go 1.8 Graceful Shutdown Python 3/21 3/18 1/27
  • 5. MINOR CHANGES Go 1.8 net/http changes from release note “The Server adds configuration options ReadHeaderTimeout and IdleTimeout and documentsWriteTimeout. ”
  • 6. NOTABLE ARTICLES https://blog.cloudflare.com/ The complete guide to Go net/http timeouts So you want to expose Go on the Internet Written by @FiloSottile (FilippoValsorda) “ Back when crypto/tls was slow and net/http young, the general wisdom was to always put Go servers behind a reverse proxy like NGINX. That's not necessary anymore! ”
  • 8. SOCKETTIMEOUTS net.Conn interface SetDeadline (SetReadDeadline/SetWriteDeadline) I/O operation with timeout Let’s Socket Programming! Socket is an API working on transport layer Go TCP Go TCP socket bind listen accept Conn Transport Layer
  • 9. HTTP SERVERTIMEOUTS Application Layer Go1.8 Go1.7 new! ReadHeaderTimeout These images are quoted from Filippo’s article on https://blog.cloudflare.com
  • 10. HTTP SERVERTIMEOUTS net/http: no way of manipulating timeouts in Handler #16100 issued at 2016-06-18 (Go 1.6.x) Go 1.8 introduces ReadHeaderTimeout Reset read deadline after reading the request header Application Layer “ Go 1.8 introduces ReadHeaderTimeout, which only covers up to the request headers. However, there's still no clear way to do reads with timeouts from a Handler. ”
  • 11. HTTP CLIENTTIMEOUTS Application Layer This image is quoted from Filippo’s article on https://blog.cloudflare.com “ Client-side timeouts can be simpler or much more complex, … ”
  • 12. CONTEXT PACKAGE context is standard way the advantage a request will cancel if parent context would cancel ctx, cancel := context.WithCancel(context.TODO()) timer := time.AfterFunc(5*time.Second, func() { cancel() }) req, err := http.NewRequest("GET",“http:// example.com”, nil) if err != nil { log.Fatal(err) } req = req.WithContext(ctx)
  • 13. SUMMARY Timeouts is important for effective/stable Web service. including against malicious attack (DoS/DDoS) Go 1.8 http.Server is enough stable!