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fix(proxy): strip Claude Code billing header from prompt for non-Anthropic providers #126

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fix(proxy): strip Claude Code billing header from prompt for non-Anthropic providers #126

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23 changes: 23 additions & 0 deletions packages/cli/src/proxy-server.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -571,6 +571,29 @@ export async function createProxyServer(
const body = await c.req.json();
const handler = await getHandlerForRequest(body.model);

// Strip Claude Code billing header from system prompt for non-Anthropic
// providers. Claude Code injects `x-anthropic-billing-header: cc_version=...; cch=XXXXX;`
// into the prompt body — the `cch=` token changes every request, breaking
// prefix caching on self-hosted inference (vLLM, Ollama). Only Anthropic
// needs this header.
if (!(handler instanceof NativeHandler)) {
if (typeof body.system === "string") {
body.system = body.system.replace(
/x-anthropic-billing-header: cc_version=[^\n]*\n?/g,
""
);
} else if (Array.isArray(body.system)) {
for (const block of body.system) {
if (block.type === "text" && typeof block.text === "string") {
block.text = block.text.replace(
/x-anthropic-billing-header: cc_version=[^\n]*\n?/g,
""
);
}
}
}
}

// Route
return handler.handle(c, body);
} catch (e) {
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