Yichen Jiang
13daefe073
Telemetry was the only call site this PR could not cover without changing the SDK transport underneath it, and both ways of doing that cost more than the channel is worth. Routing an `http.Agent` needs Node's `proxyEnv`, added in 22.21 and 24.5 — inside the engines range, so three supported runtimes stayed direct anyway, and the proxy package had to keep a `createNodeHttpAgent` export for a path that only sometimes worked. Replacing the transport with the SDK's `fetch` delegate covered every runtime but has no compression, while the shipped `base` bundle enables gzip and a realistic OTLP batch is 6.4x smaller with it; keeping both meant gzipping at the serializer, which put transport code inside a telemetry plugin. Telemetry is the one outbound channel whose loss costs the user nothing: no tool, model request, or session depends on it, and an export that cannot connect is already dropped silently. A user behind a mandatory proxy is left where they were rather than regressed. `src/index.ts`, `otel.spec.ts`, and `tsconfig.json` return to their state on master; the package keeps only a dev dependency on the proxy library. `egress.spec.ts` inverts: it installs a policy and asserts the fake proxy saw nothing, so an SDK upgrade that moved the exporter onto `fetch` would surface as a failing test rather than silently routing telemetry.
5.5 KiB
Run DSH behind a network proxy
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DSH routes its outbound requests — model calls, web search, page fetches, and MCP servers over HTTP — through the proxy named by the standard proxy environment variables. It reads them at launch; nothing else needs configuring. A few paths stay direct by design or by runtime limit, listed under "What stays direct" below.
Export the variables
export HTTPS_PROXY=http://127.0.0.1:7890
export HTTP_PROXY=http://127.0.0.1:7890
Put both lines in your shell profile so every dsh invocation inherits them. DSH also reads a .env file in the launch directory and in $DSH_HOME, so a proxy that should apply to one project can live there instead; a real environment variable always wins over a file.
A proxy that needs credentials takes them in the URL: http://user:password@proxy.example:8080. DSH never prints the password back — a proxy it reports in a diagnostic shows the username and masks the rest.
Why your browser is proxied but your terminal is not
This is the most common surprise, and it is not specific to DSH. There is no single "system proxy" that all software obeys — there are three unrelated mechanisms:
| Mechanism | Who follows it |
|---|---|
| The operating system's proxy settings | Safari, most native macOS apps, Chrome and Edge |
The HTTP_PROXY / HTTPS_PROXY environment variables |
curl, git, npm, pip, and DSH |
| TUN mode (a virtual network interface) | Everything, transparently |
The "system proxy" switch in a proxy application such as Clash writes only the first one. Browsers pick it up; command-line tools never see it. That is why exporting the variables is a separate step, and why turning on TUN mode makes both work without any variables at all.
DSH does not read the operating system's proxy settings. Export the variables, or use TUN mode.
Choose what stays direct
NO_PROXY lists hosts to reach directly:
export NO_PROXY=internal.example.com,.corp.example.com,registry.local
An entry matches an exact host, a .suffix or *.suffix domain, an optional :port, or * for everything.
CIDR ranges do not work. An operating system bypass list often contains entries like 10.0.0.0/8 or 192.168.0.0/16; copying those into NO_PROXY has no effect. Use host names or domain suffixes instead.
You do not need to list localhost or 127.0.0.1. DSH always bypasses loopback, because its own Web UI and local servers would otherwise route through the proxy and loop.
Limits worth knowing
SOCKS proxies are not supported. A socks5:// value is reported at startup and skipped, and DSH connects directly for the scheme that named it — setting HTTPS_PROXY=socks5://… alongside a usable HTTP_PROXY leaves https: direct rather than borrowing the HTTP proxy. Point the variables at your proxy application's HTTP port instead — most expose both, and the HTTP one is usually a neighbouring port number.
ALL_PROXY alone is enough. DSH falls back to it for both schemes, even though Node and curl differ on this. Setting HTTPS_PROXY explicitly is still clearer.
A TLS-intercepting corporate proxy needs its certificate. If requests fail with a certificate error once the proxy is reachable, point Node at your organisation's CA bundle before launching:
export NODE_EXTRA_CA_CERTS=/path/to/corporate-ca.pem
Node reads that variable only at process start, so export it before running dsh.
Tools DSH runs for you follow the same proxy. Commands in the bash tool, git, gh, and MCP servers started as child processes all inherit these variables. A child that is itself a Node program honors them only on Node 22.21 or later; an older Node connects directly.
A password in the proxy URL reaches those tools too. HTTPS_PROXY=http://alice:s3cret@proxy.example:8080 is a normal environment variable, so every command DSH runs — including the ones the model writes — can read it, and a command that prints its environment puts the password in output that is kept. This is how the variable already behaves for everything else in your shell. If that matters, give the proxy a credential-free entry point, or authenticate it some other way than in the URL.
What stays direct
Not every request DSH makes goes through the proxy:
- Anything on this machine. Loopback is always direct:
localhost, the whole127.0.0.0/8range,::1, and0.0.0.0. A proxy cannot usefully reach a service that only listens locally. - Code the model writes. The workflow and code-runtime workers never receive the proxy settings, so a script the model authors cannot read a proxy URL that may carry a password. Such a script reaches the network only if it configures that itself.
- Usage telemetry. The OTLP exporter uses Node's own HTTP client rather than the one a proxy configures, so telemetry connects directly and simply fails where direct egress is blocked. Nothing you do in DSH depends on it. Set
DSH_TELEMETRY_MODE=DISABLEDto turn it off entirely. web_fetchto a literal private address. A URL naming an address likehttp://10.0.0.5/is refused rather than handed to the proxy, the same refusal it gets with no proxy configured.
Check that it worked
Ask the agent to fetch a page and watch your proxy application's connection log:
dsh --profile headless "fetch https://example.com and tell me the page title"
If the request does not appear there, confirm the variables survive into DSH's own environment:
env | grep -i proxy