feat: initial LLM gateway proxy for Claude Code

.dockerignore

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+node_modules
+dist
+.env
+.env.*
+!.env.example
+.git
+.gitignore
+*.md
+.vscode
+.idea

.env.example

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+# === Required ===
+ANTHROPIC_API_KEY=sk-ant-...                     # Real Anthropic API key (stays on the server)
+PROXY_AUTH_TOKEN=your-secure-shared-secret       # Token that Claude Code uses as ANTHROPIC_AUTH_TOKEN
+
+# === Optional ===
+PORT=7860                                        # Default: 7860 (Hugging Face Spaces default)
+HOST=0.0.0.0
+LOG_LEVEL=info                                   # trace | debug | info | warn | error
+
+# Security
+RATE_LIMIT_MAX=100                               # Requests per time window per IP
+RATE_LIMIT_WINDOW_MS=60000                       # Time window in ms
+BODY_LIMIT=5242880                               # Max body size in bytes (default: 5 MB)
+CORS_ORIGIN=                                     # Empty = disabled
+
+# Upstream
+ANTHROPIC_BASE_URL=https://api.anthropic.com     # Overridable for testing
+UPSTREAM_TIMEOUT_MS=300000                       # Upstream request timeout (default: 5 min)

.gitignore

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+node_modules/
+dist/
+.env
+.env.*
+!.env.example
+*.tsbuildinfo

Dockerfile

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+# ── Stage 1: Build ────────────────────────────────────────────────────────────
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm ci --ignore-scripts
+
+COPY tsconfig.json ./
+COPY src/ ./src/
+
+RUN npm run build
+
+# ── Stage 2: Run ──────────────────────────────────────────────────────────────
+FROM node:20-alpine AS runner
+
+WORKDIR /app
+
+# Hugging Face Spaces runs containers as uid 1000
+RUN addgroup -g 1000 appgroup && \
+    adduser -u 1000 -G appgroup -s /bin/sh -D appuser && \
+    mkdir -p /data && \
+    chown -R appuser:appgroup /data /app
+
+COPY --from=builder --chown=appuser:appgroup /app/package.json /app/package-lock.json* ./
+RUN npm ci --omit=dev --ignore-scripts
+
+COPY --from=builder --chown=appuser:appgroup /app/dist/ ./dist/
+
+USER appuser
+
+# Hugging Face Spaces default port
+ENV PORT=7860
+ENV HOST=0.0.0.0
+ENV NODE_ENV=production
+
+EXPOSE 7860
+
+CMD ["node", "dist/index.js"]

README.md

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+# AI Proxy – LLM Gateway for Claude Code
+
+A transparent relay proxy that forwards [Anthropic Messages API](https://docs.anthropic.com/en/api/messages) requests from **Claude Code CLI** through environments where `api.anthropic.com` is blocked (e.g. corporate firewalls). The proxy performs auth-swap, header hygiene, and supports SSE streaming.
+
+```
+Claude Code CLI  →  AI Proxy (this server)  →  api.anthropic.com
+                    ANTHROPIC_BASE_URL           Upstream
+```
+
+## Features
+
+- **1:1 transparent relay** – no request/response body modification
+- **SSE streaming** – chunk-by-chunk forwarding, zero buffering
+- **Auth swap** – client authenticates with a shared token; server injects the real API key
+- **Header hygiene** – strips hop-by-hop headers, authorization, and client-sent API keys
+- **Rate limiting** – per-IP, configurable window and max
+- **Defensive headers** – `X-Content-Type-Options: nosniff`, `X-Frame-Options: DENY`
+- **Graceful shutdown** – finishes in-flight streams before exiting
+- **Hugging Face Spaces ready** – Docker configuration pre-set for HF Spaces deployment
+
+## Quick Start (Local)
+
+```bash
+# 1. Clone & install
+git clone <your-repo-url> && cd ai-proxy
+npm install
+
+# 2. Configure – copy and edit
+cp .env.example .env
+# Set ANTHROPIC_API_KEY and PROXY_AUTH_TOKEN in .env
+
+# 3. Run
+npm run dev
+```
+
+Health check: `curl http://localhost:7860/health`
+
+## Environment Variables
+
+| Variable | Required | Default | Description |
+|---|---|---|---|
+| `ANTHROPIC_API_KEY` | ✅ | – | Real Anthropic API key (stays on the server) |
+| `PROXY_AUTH_TOKEN` | ✅ | – | Shared secret for client authentication |
+| `PORT` | – | `7860` | Server port |
+| `HOST` | – | `0.0.0.0` | Server bind address |
+| `LOG_LEVEL` | – | `info` | `trace` \| `debug` \| `info` \| `warn` \| `error` |
+| `RATE_LIMIT_MAX` | – | `100` | Requests per time window per IP |
+| `RATE_LIMIT_WINDOW_MS` | – | `60000` | Rate limit window (ms) |
+| `BODY_LIMIT` | – | `5242880` | Max request body size (bytes, 5 MB) |
+| `CORS_ORIGIN` | – | *(disabled)* | CORS origin (e.g. `*` or `https://example.com`) |
+| `ANTHROPIC_BASE_URL` | – | `https://api.anthropic.com` | Upstream URL (override for testing) |
+| `UPSTREAM_TIMEOUT_MS` | – | `300000` | Upstream request timeout (5 min) |
+
+## API Endpoints
+
+| Method | Path | Auth | Description |
+|---|---|---|---|
+| `GET` | `/health` | No | Health check → `{"status":"ok"}` |
+| `POST` | `/v1/messages` | Yes | Chat completions (relayed 1:1) |
+| `POST` | `/v1/messages/count_tokens` | Yes | Token counting (relayed 1:1) |
+
+All other routes return `404`. Non-POST methods on API routes return `405`.
+
+## Docker
+
+### Local (docker compose)
+
+```bash
+cp .env.example .env
+# Edit .env with your keys
+docker compose up --build
+```
+
+### Hugging Face Spaces
+
+1. Create a new Space on [huggingface.co/new-space](https://huggingface.co/new-space):
+   - **SDK**: Docker
+   - **Visibility**: Private (recommended – this handles API keys)
+
+2. Push this repository to the Space:
+   ```bash
+   git remote add hf https://huggingface.co/spaces/<YOUR_USER>/<SPACE_NAME>
+   git push hf main
+   ```
+
+3. Configure **Secrets** in Space Settings → Repository secrets:
+   - `ANTHROPIC_API_KEY` = your real Anthropic key
+   - `PROXY_AUTH_TOKEN` = your chosen shared secret
+
+4. The Space will build and deploy automatically. Your proxy URL will be:
+   ```
+   https://<YOUR_USER>-<SPACE_NAME>.hf.space
+   ```
+
+> **Note:** HF Spaces secrets become environment variables at runtime. The Dockerfile already defaults to port 7860 and runs as uid 1000 as required by the platform.
+
+## Claude Code Client Configuration
+
+### Option 1: Environment Variables
+
+```bash
+export ANTHROPIC_BASE_URL=https://your-server.example.com
+export ANTHROPIC_AUTH_TOKEN=your-proxy-auth-token
+claude
+```
+
+### Option 2: Persistent (settings.json)
+
+```json
+// ~/.claude/settings.json
+{
+  "env": {
+    "ANTHROPIC_BASE_URL": "https://your-server.example.com",
+    "ANTHROPIC_AUTH_TOKEN": "your-proxy-auth-token"
+  }
+}
+```
+
+### Option 3: Managed Settings (Enterprise)
+
+```json
+// macOS: /Library/Application Support/ClaudeCode/managed-settings.json
+// Linux: /etc/claude-code/managed-settings.json
+{
+  "env": {
+    "ANTHROPIC_BASE_URL": "https://your-server.example.com"
+  }
+}
+```
+
+### Test the Connection
+
+```bash
+# Health check
+curl https://your-server.example.com/health
+
+# Test message
+curl -X POST https://your-server.example.com/v1/messages \
+  -H "Authorization: Bearer your-proxy-auth-token" \
+  -H "Content-Type: application/json" \
+  -H "anthropic-version: 2023-06-01" \
+  -d '{
+    "model": "claude-sonnet-4-20250514",
+    "max_tokens": 100,
+    "messages": [{"role": "user", "content": "Hi"}]
+  }'
+```
+
+## Tech Stack
+
+- **Runtime:** Node.js ≥ 20
+- **Framework:** [Fastify](https://fastify.dev/) 5
+- **HTTP Client:** [undici](https://undici.nodejs.org/)
+- **Language:** TypeScript (strict mode)
+
+## License
+
+MIT

docker-compose.yml

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+services:
+  ai-proxy:
+    build: .
+    ports:
+      - "${PORT:-7860}:${PORT:-7860}"
+    env_file:
+      - .env
+    restart: unless-stopped
+    healthcheck:
+      test: [ "CMD", "wget", "--spider", "-q", "http://localhost:${PORT:-7860}/health" ]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s

package-lock.json

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+}

package.json

@@ -0,0 +1,26 @@
+{
+  "name": "ai-proxy",
+  "version": "1.0.0",
+  "description": "LLM Gateway Proxy for Claude Code – transparent Anthropic API relay with auth-swap",
+  "type": "module",
+  "main": "dist/index.js",
+  "scripts": {
+    "dev": "tsx --watch src/index.ts",
+    "build": "tsc",
+    "start": "node dist/index.js"
+  },
+  "engines": {
+    "node": ">=20"
+  },
+  "dependencies": {
+    "fastify": "^5.3.3",
+    "@fastify/rate-limit": "^10.2.2",
+    "dotenv": "^16.5.0",
+    "undici": "^7.5.0"
+  },
+  "devDependencies": {
+    "typescript": "^5.8.2",
+    "@types/node": "^22.13.10",
+    "tsx": "^4.19.3"
+  }
+}

src/auth.ts

@@ -0,0 +1,28 @@
+import type { FastifyRequest, FastifyReply } from 'fastify';
+
+/**
+ * Creates a Fastify onRequest hook that validates the Authorization header
+ * against the configured proxy auth token.
+ *
+ * Rejects with 401 if the header is missing or the token doesn't match.
+ */
+export function createAuthHook(proxyAuthToken: string): (request: FastifyRequest, reply: FastifyReply) => Promise<void> {
+    return async (request: FastifyRequest, reply: FastifyReply): Promise<void> => {
+        const authHeader = request.headers['authorization'];
+
+        if (!authHeader) {
+            reply.code(401).send({ error: 'Missing Authorization header' });
+            return;
+        }
+
+        // Support "Bearer <token>" format
+        const token = authHeader.startsWith('Bearer ')
+            ? authHeader.slice(7)
+            : authHeader;
+
+        if (token !== proxyAuthToken) {
+            reply.code(401).send({ error: 'Invalid authorization token' });
+            return;
+        }
+    };
+}

src/config.ts

@@ -0,0 +1,49 @@
+import 'dotenv/config';
+import type { ProxyConfig } from './types.js';
+
+/**
+ * Reads a required environment variable or aborts the process.
+ */
+function requireEnv(name: string): string {
+    const value = process.env[name]?.trim();
+    if (!value) {
+        console.error(`[FATAL] Missing required environment variable: ${name}`);
+        process.exit(1);
+    }
+    return value;
+}
+
+/**
+ * Reads an optional environment variable with a fallback default.
+ */
+function optionalEnv(name: string, fallback: string): string {
+    return process.env[name]?.trim() || fallback;
+}
+
+/**
+ * Parses and validates all environment variables into a typed, frozen config object.
+ * Aborts the process immediately if required variables are missing.
+ */
+export function loadConfig(): ProxyConfig {
+    const config: ProxyConfig = {
+        anthropicApiKey: requireEnv('ANTHROPIC_API_KEY'),
+        proxyAuthToken: requireEnv('PROXY_AUTH_TOKEN'),
+        port: parseInt(optionalEnv('PORT', '7860'), 10),
+        host: optionalEnv('HOST', '0.0.0.0'),
+        logLevel: optionalEnv('LOG_LEVEL', 'info'),
+        rateLimitMax: parseInt(optionalEnv('RATE_LIMIT_MAX', '100'), 10),
+        rateLimitWindowMs: parseInt(optionalEnv('RATE_LIMIT_WINDOW_MS', '60000'), 10),
+        bodyLimit: parseInt(optionalEnv('BODY_LIMIT', '5242880'), 10),
+        corsOrigin: optionalEnv('CORS_ORIGIN', ''),
+        anthropicBaseUrl: optionalEnv('ANTHROPIC_BASE_URL', 'https://api.anthropic.com'),
+        upstreamTimeoutMs: parseInt(optionalEnv('UPSTREAM_TIMEOUT_MS', '300000'), 10),
+    };
+
+    // Validate numeric values
+    if (isNaN(config.port) || config.port < 1 || config.port > 65535) {
+        console.error(`[FATAL] Invalid PORT value: ${process.env['PORT']}`);
+        process.exit(1);
+    }
+
+    return Object.freeze(config);
+}

src/index.ts

@@ -0,0 +1,138 @@
+import Fastify, { type FastifyError } from 'fastify';
+import rateLimit from '@fastify/rate-limit';
+import { loadConfig } from './config.js';
+import { createAuthHook } from './auth.js';
+import { forwardRequest } from './proxy.js';
+import { PROXY_ROUTES } from './types.js';
+
+const config = loadConfig();
+
+const app = Fastify({
+    logger: {
+        level: config.logLevel,
+        // Redact sensitive fields from logs
+        redact: ['req.headers.authorization', 'req.headers["x-api-key"]'],
+    },
+    bodyLimit: config.bodyLimit,
+    trustProxy: true,
+});
+
+/** Register rate limiting. */
+await app.register(rateLimit, {
+    max: config.rateLimitMax,
+    timeWindow: config.rateLimitWindowMs,
+    addHeadersOnExceeding: { 'x-ratelimit-limit': true, 'x-ratelimit-remaining': true, 'x-ratelimit-reset': true },
+    addHeaders: { 'x-ratelimit-limit': true, 'x-ratelimit-remaining': true, 'x-ratelimit-reset': true, 'retry-after': true },
+});
+
+/** Optional CORS support – @fastify/cors must be installed separately. */
+if (config.corsOrigin) {
+    try {
+        // Dynamic import: @fastify/cors is an optional dependency
+        // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+        const corsPlugin = await import(/* webpackIgnore: true */ '@fastify/cors' + '');
+        // eslint-disable-next-line @typescript-eslint/no-unsafe-argument, @typescript-eslint/no-unsafe-member-access
+        await app.register(corsPlugin.default ?? corsPlugin, { origin: config.corsOrigin });
+    } catch {
+        app.log.warn('CORS_ORIGIN is set but @fastify/cors is not installed. Run: npm install @fastify/cors');
+    }
+}
+
+/** Add defensive response headers to every response. */
+app.addHook('onSend', async (_request, reply) => {
+    reply.header('X-Content-Type-Options', 'nosniff');
+    reply.header('X-Frame-Options', 'DENY');
+});
+
+/** Auth hook instance. */
+const authHook = createAuthHook(config.proxyAuthToken);
+
+/**
+ * Content-Type validation hook for API routes.
+ * Rejects requests that don't send application/json.
+ */
+async function validateContentType(
+    request: Parameters<typeof authHook>[0],
+    reply: Parameters<typeof authHook>[1],
+): Promise<void> {
+    const ct = request.headers['content-type'];
+    if (!ct || !ct.includes('application/json')) {
+        reply.code(415).send({ error: 'Unsupported Media Type. Expected application/json.' });
+    }
+}
+
+// ── Routes ──────────────────────────────────────────────────────────────────
+
+/** Health check – no auth required. */
+app.get('/health', async (_request, reply) => {
+    reply.send({ status: 'ok' });
+});
+
+/** Register proxy routes. */
+for (const route of PROXY_ROUTES) {
+    app.post(route, {
+        onRequest: [authHook, validateContentType],
+    }, async (request, reply) => {
+        await forwardRequest(request, reply, route, config, app.log);
+    });
+}
+
+/** Catch-all 404 for unregistered routes. */
+app.setNotFoundHandler((_request, reply) => {
+    reply.code(404).send({ error: 'Not found' });
+});
+
+/** Method not allowed – not needed since Fastify handles it,
+ *  but we customize the response format. */
+app.setErrorHandler((error: FastifyError, _request, reply) => {
+    const statusCode = error.statusCode ?? 500;
+
+    if (statusCode === 405) {
+        reply.code(405).send({ error: 'Method not allowed' });
+        return;
+    }
+    if (statusCode === 429) {
+        // Rate limit exceeded – forward Fastify's rate-limit response
+        reply.code(429).send({ error: 'Too many requests. Please retry later.' });
+        return;
+    }
+
+    app.log.error({ err: error }, 'Unhandled error');
+    reply.code(statusCode).send({ error: 'Internal server error' });
+});
+
+// ── Server Start ────────────────────────────────────────────────────────────
+
+const start = async (): Promise<void> => {
+    try {
+        await app.listen({ port: config.port, host: config.host });
+        app.log.info(`Proxy listening on ${config.host}:${config.port}`);
+    } catch (err) {
+        app.log.fatal({ err }, 'Failed to start server');
+        process.exit(1);
+    }
+};
+
+// ── Graceful Shutdown ───────────────────────────────────────────────────────
+
+const shutdown = async (signal: string): Promise<void> => {
+    app.log.info(`Received ${signal}, shutting down gracefully…`);
+    try {
+        await app.close();
+        app.log.info('Server closed.');
+        process.exit(0);
+    } catch (err) {
+        app.log.error({ err }, 'Error during shutdown');
+        process.exit(1);
+    }
+};
+
+process.on('SIGTERM', () => void shutdown('SIGTERM'));
+process.on('SIGINT', () => void shutdown('SIGINT'));
+
+// Catch unhandled rejections to keep the server stable
+process.on('unhandledRejection', (reason) => {
+    app.log.error({ reason }, 'Unhandled promise rejection');
+});
+
+await start();

src/proxy.ts

@@ -0,0 +1,133 @@
+import { request as undiciRequest } from 'undici';
+import type { FastifyRequest, FastifyReply, FastifyBaseLogger } from 'fastify';
+import type { ProxyConfig } from './types.js';
+import { FORWARDED_HEADERS, HOP_BY_HOP_HEADERS } from './types.js';
+
+/**
+ * Builds the sanitized header set for the upstream request.
+ *
+ * - Forwards only explicitly allowed headers from the client
+ * - Strips authorization and x-api-key (client must not set the real key)
+ * - Strips hop-by-hop headers
+ * - Injects the real Anthropic API key as x-api-key
+ */
+function buildUpstreamHeaders(
+    incomingHeaders: Record<string, string | string[] | undefined>,
+    anthropicApiKey: string,
+): Record<string, string> {
+    const headers: Record<string, string> = {};
+
+    for (const name of FORWARDED_HEADERS) {
+        const value = incomingHeaders[name];
+        if (value !== undefined) {
+            headers[name] = Array.isArray(value) ? value.join(', ') : value;
+        }
+    }
+
+    // Inject the real API key
+    headers['x-api-key'] = anthropicApiKey;
+
+    return headers;
+}
+
+/**
+ * Checks whether a response header should be forwarded back to the client.
+ * Strips hop-by-hop and internal headers.
+ */
+function shouldForwardResponseHeader(name: string): boolean {
+    const lower = name.toLowerCase();
+    if (HOP_BY_HOP_HEADERS.includes(lower)) return false;
+    if (lower === 'x-api-key') return false;
+    return true;
+}
+
+/**
+ * Forwards an incoming request to the upstream Anthropic API and streams
+ * or relays the response back to the client.
+ *
+ * - Streaming: if upstream responds with `text/event-stream`, the body is
+ *   piped directly to the client without buffering.
+ * - Non-streaming: the full response body is read and sent back.
+ * - Errors from upstream are forwarded with their original status code and body.
+ */
+export async function forwardRequest(
+    request: FastifyRequest,
+    reply: FastifyReply,
+    targetPath: string,
+    config: ProxyConfig,
+    logger: FastifyBaseLogger,
+): Promise<void> {
+    const upstreamUrl = `${config.anthropicBaseUrl}${targetPath}`;
+
+    const upstreamHeaders = buildUpstreamHeaders(
+        request.headers as Record<string, string | string[] | undefined>,
+        config.anthropicApiKey,
+    );
+
+    logger.debug({ upstreamUrl, headers: Object.keys(upstreamHeaders) }, 'Forwarding request upstream');
+
+    let upstreamResponse: Awaited<ReturnType<typeof undiciRequest>>;
+    try {
+        upstreamResponse = await undiciRequest(upstreamUrl, {
+            method: 'POST',
+            headers: upstreamHeaders,
+            body: JSON.stringify(request.body),
+            headersTimeout: config.upstreamTimeoutMs,
+            bodyTimeout: config.upstreamTimeoutMs,
+        });
+    } catch (err: unknown) {
+        const message = err instanceof Error ? err.message : 'Unknown upstream error';
+        logger.error({ err }, 'Upstream request failed');
+
+        // Distinguish timeout from other errors
+        if (message.includes('timeout') || message.includes('Timeout')) {
+            reply.code(504).send({ error: 'Upstream request timed out' });
+        } else {
+            reply.code(502).send({ error: 'Failed to connect to upstream API' });
+        }
+        return;
+    }
+
+    const { statusCode, headers: responseHeaders, body: responseBody } = upstreamResponse;
+
+    // Forward response headers (filtered)
+    const forwardedHeaders: Record<string, string | string[]> = {};
+    for (const [name, value] of Object.entries(responseHeaders)) {
+        if (value !== undefined && shouldForwardResponseHeader(name)) {
+            forwardedHeaders[name] = value;
+        }
+    }
+
+    const contentType = responseHeaders['content-type'];
+    const isStreaming =
+        typeof contentType === 'string' && contentType.includes('text/event-stream');
+
+    if (isStreaming) {
+        // Streaming: pipe upstream SSE body directly to the client without buffering
+        logger.debug('Streaming SSE response to client');
+
+        reply.raw.writeHead(statusCode, forwardedHeaders as Record<string, string>);
+
+        for await (const chunk of responseBody) {
+            if (!reply.raw.write(chunk)) {
+                // Back-pressure: wait for drain
+                await new Promise<void>((resolve) => reply.raw.once('drain', resolve));
+            }
+        }
+
+        reply.raw.end();
+        // Mark the reply as sent so Fastify doesn't try to send again
+        reply.hijack();
+    } else {
+        // Non-streaming: read full body and forward
+        const bodyChunks: Buffer[] = [];
+        for await (const chunk of responseBody) {
+            bodyChunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
+        }
+        const fullBody = Buffer.concat(bodyChunks);
+
+        logger.debug({ statusCode, bodyLength: fullBody.length }, 'Forwarding non-streaming response');
+
+        reply.code(statusCode).headers(forwardedHeaders).send(fullBody);
+    }
+}

src/types.ts

@@ -0,0 +1,55 @@
+/** Shared TypeScript types for the proxy server. */
+
+/** Typed server configuration derived from environment variables. */
+export interface ProxyConfig {
+    /** Anthropic API key used for upstream requests. */
+    readonly anthropicApiKey: string;
+    /** Shared secret token for client authentication. */
+    readonly proxyAuthToken: string;
+    /** Server listen port. */
+    readonly port: number;
+    /** Server listen host. */
+    readonly host: string;
+    /** Pino log level. */
+    readonly logLevel: string;
+    /** Max requests per rate-limit window per IP. */
+    readonly rateLimitMax: number;
+    /** Rate-limit window duration in ms. */
+    readonly rateLimitWindowMs: number;
+    /** Max request body size in bytes. */
+    readonly bodyLimit: number;
+    /** CORS origin (empty string = disabled). */
+    readonly corsOrigin: string;
+    /** Upstream Anthropic base URL. */
+    readonly anthropicBaseUrl: string;
+    /** Upstream request timeout in ms. */
+    readonly upstreamTimeoutMs: number;
+}
+
+/** Headers that must be forwarded to the upstream API. */
+export const FORWARDED_HEADERS: ReadonlyArray<string> = [
+    'anthropic-beta',
+    'anthropic-version',
+    'content-type',
+    'accept',
+    'x-request-id',
+] as const;
+
+/** Hop-by-hop headers that must be stripped before forwarding. */
+export const HOP_BY_HOP_HEADERS: ReadonlyArray<string> = [
+    'connection',          // Controls if the network connection stays open after the current transaction.
+    'keep-alive',          // Settings for persistent connections.
+    'transfer-encoding',   // Specifies the form of encoding used to safely transfer the payload.
+    'upgrade',             // Mechanism for switching to a different protocol (e.g., WebSocket).
+    'proxy-authorization', // Credentials for authenticating the client with a proxy.
+    'te',                  // Specifies the transfer encodings the user agent is willing to accept.
+    'trailer',             // Indicates that specific headers will be present in the trailer of a chunked message.
+] as const;
+
+/** Allowed proxy route paths. */
+export const PROXY_ROUTES = [
+    '/v1/messages',
+    '/v1/messages/count_tokens',
+] as const;
+
+export type ProxyRoute = (typeof PROXY_ROUTES)[number];

tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "compilerOptions": {
+        "target": "ES2022",
+        "module": "NodeNext",
+        "moduleResolution": "NodeNext",
+        "outDir": "dist",
+        "rootDir": "src",
+        "strict": true,
+        "esModuleInterop": true,
+        "skipLibCheck": true,
+        "forceConsistentCasingInFileNames": true,
+        "resolveJsonModule": true,
+        "declaration": true,
+        "declarationMap": true,
+        "sourceMap": true
+    },
+    "include": [
+        "src/**/*"
+    ],
+    "exclude": [
+        "node_modules",
+        "dist"
+    ]
+}