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Build your own webserver with PHP
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Igor Wiedler
November 20, 2013
Programming
1
1.2k
Build your own webserver with PHP
Igor Wiedler
November 20, 2013
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Transcript
Build your own web server with
@igorwesome
Event-driven, non-blocking I/O with PHP.
None
When you open your web browser… ! What actually happens?
None
http://igor.io/
DNS Where is igor.io?
DNS 176.58.127.253
176.58.127.253
2^16! 65535! TCP ports
TCP port 80
SYN
SYN/ACK
ACK
None
GET / HTTP/1.1! Host: igor.io
HTTP/1.1 200 OK! Content-Type: text/html! ! …
HTTP TCP IP
Layers +---+--------------+----------------+ | 7 | Application | HTTP, FTP, DNS
| | 6 | Presentation | TLS | | 5 | Session | TCP | | 4 | Transport | TCP, UDP | | 3 | Network | IP | | 2 | Data Link | ARP, PPP | | 1 | Physical | | +---+--------------+----------------+
http://igor.io/
http://igor.io:80/
http://igor.io:80/ } DNS (layer 7)! resolves to! IP (layer 3)
http://igor.io:80/ } TCP (layer 4)
http://igor.io:80/ } TLS (layer 6)! HTTP (layer 7) } HTTP
(layer 7)
The Socket API
________ < socket > -------- \ ^__^ \ (oo)\_______ (__)\
)\/\ ||----w | || ||
#include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> socket() -------- bind() listen()
accept() -------- connect()
Syscalls Process socket! bind! listen! accept! connect! ! read! write!
close! !
Stream Sockets
I will show you Les Codes 00
HTTP: The Protocol
Request GET / HTTP/1.1 <--- request line Host: igor.io <---
header <--- line feed <--- body (blank)
Response HTTP/1.1 200 OK <--- status line Content-Length: 2 <---
headers <--- line feed Hi <--- body
Verbs •GET •POST
Verbs •GET •POST •PUT •DELETE
Verbs •GET •POST •PUT •DELETE ! •HEAD •OPTIONS •TRACE •CONNECT
• 1xx - Special protocol stuff • 2xx - All
good • 3xx - Redirection • 4xx - You messed up • 5xx - I messed up Status codes
Keep-Alive
Streaming • Transfer-Encoding: chunked • dechex(strlen($chunk)) \r\n $chunk \r\n •
0 \r\n \r\n
General weirdness • Trailers • Repeated headers • 100 Continue
ABNF is very permissive
HTTP/1.1 RFC 2616 read it.
Parsing
Request GET / HTTP/1.1 <--- request line Host: igor.io <---
header <--- line feed <--- body (blank)
More codes 01, 02
Problem? • Incomplete HTTP parser • Missing error handling •
Assumption: request can be read in one go • Assumption: request no larger than 512 bytes • Assumption: request/response body fits in memory • Blocking I/O
Non-blocking I/O
Even more codes 03-08
Unreadable
LOL error handling
Writing your own HTTP server is hard
Don’t do it.
None
Questions? joind.in/9277 ! reactphp.org ! @igorwesome ! ! github.com/igorw/webserver-zceu
Bonus • Memory leaks • Too fast reads / too
slow writes • libevent / libev / libuv • Promises • Generators • pthreads • WebSockets
Logo credits • Netscape • Apache • FreeBSD • Erlang