import axios, { AxiosInstance, AxiosError } from 'axios';
/**
* Creates an axios instance with exponential backoff retry logic
*/
export function createHttpClient(baseURL?: string, timeout = 30000): AxiosInstance {
const client = axios.create({
baseURL,
timeout,
headers: {
'User-Agent': 'Legal-Compliance-MCP/1.0.0',
},
});
// Retry interceptor with exponential backoff
client.interceptors.response.use(
(response) => response,
async (error: AxiosError) => {
const config = error.config as any;
// Don't retry if retry count is already set and exceeded
if (config && config.__retryCount >= 3) {
return Promise.reject(error);
}
// Don't retry on 4xx errors (client errors)
if (error.response && error.response.status >= 400 && error.response.status < 500) {
return Promise.reject(error);
}
// Set retry count
config.__retryCount = config.__retryCount || 0;
config.__retryCount += 1;
// Calculate delay: 1s, 2s, 4s
const delay = Math.pow(2, config.__retryCount - 1) * 1000;
await new Promise((resolve) => setTimeout(resolve, delay));
return client(config);
}
);
return client;
}
