Merge pull request #65 from snyk/keep-alive-agent

feat: axios agent keep alive to reuse connections

src/axios.ts

@@ -1,11 +1,24 @@
 import axios, { AxiosRequestConfig, AxiosError, AxiosResponse } from 'axios';
+import http from 'http';
+import https from 'https';
 import emitter from './emitter';
 
+const agentOptions = {
+  keepAlive: true,
+  maxSockets: 100, // Maximum number of sockets to allow per host. Defaults to Infinity.
+  maxFreeSockets: 10,
+  freeSocketTimeout: 60000, // // Maximum number of sockets to leave open for 60 seconds in a free state. Only relevant if keepAlive is set to true. Defaults to 256.
+  socketActiveTTL: 1000 * 60 * 10,
+};
+
 const axios_ = axios.create({
   responseType: 'json',
   headers: {
     'Content-Type': 'application/json;charset=utf-8',
   },
+  // keepAlive pools and reuses TCP connections, so it's faster
+  httpAgent: new http.Agent(agentOptions),
+  httpsAgent: new https.Agent(agentOptions),
 });
 
 axios_.interceptors.request.use(