Description

• Since Crystal language lacks a perfect HTTP2 implementation, we implemented it.
  • We spent some time to do this, it is not very easy.
  • We started looking at many documents and started researching how to build a HTTP2 server.
• In the Hpack, Huffman part, we reference to the design of ysbaddaden.
• Channel design (ConnectionPool) is used inside HTTP2 server.
• It currently supports most HTTP2 flow control features (excluding priority).
• It can currently be perfectly combined with HTTP1 server.
  • Including Chunked, Compress, and Empty body, ...
• Currently it needs to be regularly synchronized with Crystal upstream.
  • Some monkey patches were used at the junction (E.g. Server::RequestProcessor, Server::Response).
  • Currently only supports up to Crystal 0.36.

Features

• Basic HTTP2 server features.
• HTTP Server compatibility (HTTP1 & HTTP2).
• Simplify the complex, Clear code syntax.
• HTTP2 client feature.
• More Spec tests.
• More Contributions.

Test Information

• h2load

$ h2load -n 100000 -c 100 -t 1 -T 5 -m 10 -H 'Accept-Encoding: gzip,deflate' https://127.0.0.1:9876
starting benchmark...
spawning thread #0: 100 total client(s). 100000 total requests
TLS Protocol: TLSv1.3
Cipher: TLS_AES_256_GCM_SHA384
Server Temp Key: ECDH P-256 256 bits
Application protocol: h2
progress: 10% done
progress: 20% done
progress: 30% done
progress: 40% done
progress: 50% done
progress: 60% done
progress: 70% done
progress: 80% done
progress: 90% done
progress: 100% done

finished in 12.11s, 8255.80 req/s, 508.46KB/s
requests: 100000 total, 100000 started, 100000 done, 100000 succeeded, 0 failed, 0 errored, 0 timeout
status codes: 100000 2xx, 0 3xx, 0 4xx, 0 5xx
traffic: 6.01MB (6306700) total, 1.24MB (1300000) headers (space savings 71.74%), 3.05MB (3200000) data
                     min         max         mean         sd        +/- sd
time for request:    27.49ms       3.00s    105.87ms    165.93ms    99.04%
time for connect:    45.34ms       2.89s       1.47s    831.38ms    58.00%
time to 1st byte:      2.96s       3.08s       3.02s     32.89ms    58.00%
req/s           :      82.57       83.63       82.95        0.34    74.00%

• Curl

$ curl -v "https://127.0.0.1:9876" --insecure
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 9876 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/ssl/cert.pem
  CApath: none
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
* TLSv1.2 (IN), TLS handshake, Server finished (14):
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (IN), TLS handshake, Finished (20):
* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
* ALPN, server accepted to use h2
* Server certificate:
*  subject: C=FI; ST= ; L= ; O= ; OU= ; CN=Finland; emailAddress= 
*  start date: Jun 30 08:22:14 2019 GMT
*  expire date: Jun 29 08:22:14 2021 GMT
*  issuer: C=FI; ST= ; L= ; O= ; OU= ; CN=Finland; emailAddress= 
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x7fde8580dc00)
> GET / HTTP/2
> Host: 127.0.0.1:9876
> User-Agent: curl/7.64.1
> Accept: */*
> 
* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
< HTTP/2 200 
< content-length: 12
< 
* Connection #0 to host 127.0.0.1 left intact
Hello World!
* Closing connection 0

Multithreading (Parallel)

• Crystal enabling -Dpreview_mt will cause a lot of failed in h2load.
  • This will increase the speed by 1x, this problem needs to be resolved.

$ h2load -n 100000 -c 100 -t 1 -T 5 -m 10 -H 'Accept-Encoding: gzip,deflate' https://127.0.0.1:9876
starting benchmark...
spawning thread #0: 100 total client(s). 100000 total requests
TLS Protocol: TLSv1.3
Cipher: TLS_AES_256_GCM_SHA384
Server Temp Key: ECDH P-256 256 bits
Application protocol: h2
progress: 10% done
progress: 20% done
progress: 30% done
progress: 40% done
progress: 50% done
progress: 60% done
progress: 70% done
progress: 80% done

finished in 5.51s, 14877.00 req/s, 916.71KB/s
requests: 100000 total, 82180 started, 82000 done, 82000 succeeded, 18000 failed, 18000 errored, 0 timeout
status codes: 82018 2xx, 0 3xx, 0 4xx, 0 5xx
traffic: 4.93MB (5174068) total, 1.02MB (1066234) headers (space savings 71.74%), 2.50MB (2624000) data
                     min         max         mean         sd        +/- sd
time for request:      105us    970.27ms     46.09ms     95.82ms    90.93%
time for connect:    53.03ms    789.04ms    413.19ms    219.45ms    60.00%
time to 1st byte:   785.89ms       1.20s    872.68ms     84.87ms    89.02%
req/s           :       0.00      254.78      163.72       78.86    79.00%

Usage

• Need to be used with Cherry.cr (load certificate / private key via Text)

require "forest"
require "cherry"

context = OpenSSL::SSL::Context::Server.new
context.ca_certificate_text = Base64.decode_string "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"
context.private_key_text = Base64.decode_string "-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
"
context.alpn_protocol = "h2"

server = HTTP::Server.new [HTTP::CompressHandler.new] do |context|
  STDOUT.puts [context]
  context.response << "Hello World!"
end

address = server.bind_tls Socket::IPAddress.new("0.0.0.0", 9876_i32), context
STDOUT.puts "Listening on https://#{address}"
server.listen

Installation

$ git clone https://github.com/636f7374/forest.cr.git
$ cd forest.cr && make build && make install

Development

$ make test

References

• StackOverflow - Why do web browsers not support h2c (HTTP/2 without TLS)?
• HttpWG - Hypertext Transfer Protocol Version 2 (HTTP/2)
• Blog - Programmersought HTTP2 detailed
• StackOverflow - WINDOW_UPDATE HTTP/2 frame
• Blog - HTTP: HTTP/2 - High Performance Browser Networking (O'Reilly)
• Medium - HTTP/2 Flow Control
• Cloudflare - HTTP/2 For Web Developers
• Wireshark - Hypertext Transfer Protocol version 2

Credit

• _Icon - Freepik/WebDevelopment

Contributors

License

• MIT License