qwencode-proxy

Local HTTP proxy between qwen-code and its model. Rewrites chat traffic via pluggable rules. Single Go binary, no dependencies.

Install

Requires qwen-code (npm install -g @qwen-code/qwen-code).

Download a prebuilt binary from Releases — no Go needed. Extract and put it on your PATH.

Or, with Go 1.24+:

go install github.com/anh-ld/qwencode-proxy@latest

Use

qwencode-proxy                # first run: setup, then launch qwen
qwencode-proxy "fix auth.go"  # any qwen args
qwencode-proxy off            # restore original settings.json
qwencode-proxy config [-e]    # show / edit config

Tips

• Auto-detects upstream from ~/.qwen/settings.json, backs it up, points qwen at 127.0.0.1:8788.
• Always launch via qwencode-proxy. Once set up, qwen alone points at the proxy port, so it errors with fetch failed unless the proxy is running (or restore with qwencode-proxy off).
• Change port in ~/.config/qwencode-proxy/config.json.
• Optional alias: alias qwen=qwencode-proxy.
• Port busy → change port in config.
• Config corrupt → run qwencode-proxy setup.

Rules

Config (~/.config/qwencode-proxy/config.json):

{
  "upstream": "https://dashscope.aliyuncs.com/compatible-mode/v1",
  "port": 8788,
  "dump": false,
  "dumpMaxBytes": 10485760,
  "rules": [
    { "type": "strip-pair",    "open": "<think>", "close": "</think>" },
    { "type": "set-param",     "params": { "model": "qwen-coder-plus" } },
    { "type": "remove-param",  "keys": ["top_p", "frequency_penalty"] },
    { "type": "inject-system", "position": "append", "text": "Be concise." },
    { "type": "replace",       "find": "foo", "replace": "bar" }
  ]
}

All rules accept "enabled": true|false (default true). Unknown types skipped. Streaming-safe: partial tags buffer; trailing tail flushes on finish_reason.

Type	Effect	Fields
strip-pair	Drop <open>…</close> from response	open (default <think>), close (default </think>)
replace	Literal find/replace on response	find (required), replace (default "")
inject-system	Add a system message to request	text (required), position ("prepend" default / "append")
set-param	Set fields on request body	params (required, key/value object)
remove-param	Delete fields from request body	keys (required, list) — e.g. drop top_p a provider rejects with 400

Debugging

Capture chat request/response bodies to ~/.config/qwencode-proxy/dump.log:

QP_DUMP=1 qwencode-proxy        # ad-hoc, or set "dump": true in config

Cap the file with "dumpMaxBytes": N (default 10 MiB); once full it stops writing — delete the file to reset. Use it to see the raw bytes a provider actually receives/returns when writing remove-param or strip-pair rules.

Build & test

go build .
go test ./...