CCF2026 ylong_http HTTPS Proxy Prototype

This submission contains two deliverables:

1. A runnable, dependency-free Rust prototype crate that demonstrates a complete HTTPS-target proxy tunnel flow.
2. A compile-checked patch for the official openharmony/commonlibrary_rust_ylong_http async connector path.

The prototype focuses on the contest’s minimum reproducible loop:

• HTTP CONNECT host:port HTTP/1.1 request generation.
• HTTPS target authority handling, defaulting to port 443.
• Optional Proxy-Authorization: Basic ....
• Proxy failure handling for 407, generic non-200 status codes, malformed responses, oversized headers, and timeout.
• A simulated HTTPS-proxy handshake proving the ordering TCP -> proxy TLS -> CONNECT -> target tunnel.
• A local tunnel round trip demo.

Repository Layout

.
|-- Cargo.toml
|-- src/
|   |-- lib.rs                         # Prototype client implementation
|   `-- main.rs                        # Loopback demo binary
|-- tests/proxy_flow.rs                # Integration tests with a local fake proxy
|-- patches/official_https_proxy_async.patch
|-- technical_solution.md
|-- testing.md
|-- usage.md
|-- demo_script.ps1
|-- submission_checklist.md
|-- final_report.md
`-- vendor/research/commonlibrary_rust_ylong_http/
    `-- ...                            # Shallow clone of official repo with patch applied

Quick Start

PowerShell:

Set-Location C:\CCFOpenSourcepowershell
Set-Location C:\CCFOpenSource\08_ylong_http_proxy
.\demo_script.ps1
8_ylong_http_proxy
.\demo_script.ps1

Manual commands:

$env:RUSTUP_HOME='C:\CCFOpenSourcepowershell
$env:RUSTUP_HOME='C:\CCFOpenSource\08_ylong_http_proxy\.rustup'
$env:CARGO_HOME='C:\CCFOpenSource\08_ylong_http_proxy\.cargo'
$env:PATH='C:\CCFOpenSource\08_ylong_http_proxy\.cargo\bin;' + $env:PATH
cargo test -- --nocapture
cargo run --bin proxy_demo
8_ylong_http_proxy\.rustup'
$env:CARGO_HOME='C:\CCFOpenSourcepowershell
$env:RUSTUP_HOME='C:\CCFOpenSource\08_ylong_http_proxy\.rustup'
$env:CARGO_HOME='C:\CCFOpenSource\08_ylong_http_proxy\.cargo'
$env:PATH='C:\CCFOpenSource\08_ylong_http_proxy\.cargo\bin;' + $env:PATH
cargo test -- --nocapture
cargo run --bin proxy_demo
8_ylong_http_proxy\.cargo'
$env:PATH='C:\CCFOpenSourcepowershell
$env:RUSTUP_HOME='C:\CCFOpenSource\08_ylong_http_proxy\.rustup'
$env:CARGO_HOME='C:\CCFOpenSource\08_ylong_http_proxy\.cargo'
$env:PATH='C:\CCFOpenSource\08_ylong_http_proxy\.cargo\bin;' + $env:PATH
cargo test -- --nocapture
cargo run --bin proxy_demo
8_ylong_http_proxy\.cargo\bin;' + $env:PATH
cargo test -- --nocapture
cargo run --bin proxy_demo

Verification Snapshot

• Prototype tests: 10 passed / 0 failed.
• Covered scenarios: CONNECT, HTTPS target, Basic Auth, 407, 502, timeout, simulated HTTPS proxy TLS, tunnel round trip, URL parsing, Basic Auth encoding.
• Prototype hot test run: 0.624s.
• Official patch check:
  • cargo check -p ylong_http_client --features "async,http1_1,tokio_base,tls_default" passed.
  • cargo check -p ylong_http_client --features "async,http1_1,http2,tokio_base,tls_default" passed.

See testing.md and final_report.md for details.

Research Sources

• CCF news page listing the topic: https://www.ccf.org.cn/Media_list/ccfosc/2026-03-23/865094.shtml
• GitLink topic page: https://www.gitlink.org.cn/competitions/track1_2026ylong_http
• Official GitHub repository: https://github.com/openharmony/commonlibrary_rust_ylong_http
• HTTP CONNECT reference: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/CONNECT