DO NOT MERGE; Implement http.Handler

[mmatczuk]

This patch is an experiment replacing TCP connection handle loop with http.Server. It actually works, the tests are passing, and you can run Martian as HTTP/2 server this way. It's fully compatible with HTTP/2 CONNECT spec [1]. Below example of sending h2 traffic over h2 proxy

*   Trying 127.0.0.1:3128...
* Connected to (nil) (127.0.0.1) port 3128 (#0)
* ALPN: offers http/1.1
* TLSv1.0 (OUT), TLS header, Certificate Status (22):
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS header, Finished (20):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.2 (OUT), TLS header, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256
* ALPN: server accepted http/1.1
* Proxy certificate:
*  subject: O=Sauce Labs Inc.
*  start date: Nov 17 13:23:26 2022 GMT
*  expire date: Nov 17 13:23:26 2023 GMT
*  issuer: O=Sauce Labs Inc.
*  SSL certificate verify result: self-signed certificate (18), continuing anyway.
* allocate connect buffer
* Establish HTTP proxy tunnel to httpbin:443
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
> CONNECT httpbin:443 HTTP/1.1
> Host: httpbin:443
> User-Agent: curl/7.85.0
> Proxy-Connection: Keep-Alive
>
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
< HTTP/1.1 200 OK
< Connection: close
<
* Proxy replied 200 to CONNECT request
* CONNECT phase completed
* ALPN: offers h2
* ALPN: offers http/1.1
* TLSv1.0 (OUT), TLS header, Certificate Status (22):
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.2 (IN), TLS header, Certificate Status (22):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.2 (IN), TLS header, Finished (20):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.2 (OUT), TLS header, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* SSL connection using TLSv1.3 / TLS_AES_128_GCM_SHA256
* ALPN: server accepted h2
* Server certificate:
*  subject: O=Sauce Labs Inc.
*  start date: Nov 17 13:23:26 2022 GMT
*  expire date: Nov 17 13:23:26 2023 GMT
*  issuer: O=Sauce Labs Inc.
*  SSL certificate verify result: self-signed certificate (18), continuing anyway.
* Using HTTP2, server supports multiplexing
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* h2h3 [:method: GET]
* h2h3 [:path: /status/200]
* h2h3 [:scheme: https]
* h2h3 [:authority: httpbin]
* h2h3 [user-agent: curl/7.85.0]
* h2h3 [accept: */*]
* Using Stream ID: 1 (easy handle 0xaaaaeaeb27c0)
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
> GET /status/200 HTTP/2
> Host: httpbin
> user-agent: curl/7.85.0
> accept: */*
>
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* Connection state changed (MAX_CONCURRENT_STREAMS == 250)!
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (OUT), TLS header, Supplemental data (23):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
* TLSv1.2 (IN), TLS header, Supplemental data (23):
< HTTP/2 200
< content-length: 0
< date: Thu, 17 Nov 2022 13:24:01 GMT
<
* Connection #0 to host (nil) left intact

[1] https://datatracker.ietf.org/doc/html/rfc7540#section-8.3

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[mmatczuk]

Sorry not this repo.