feat: adds agentkeepalive (#882)

package.json

@@ -32,6 +32,7 @@
   "license": "MIT",
   "dependencies": {
     "@scaleleap/amazon-marketplaces": "12.0.1",
+    "agentkeepalive": "4.1.4",
     "axios": "0.24.0",
     "client-oauth2": "4.3.3",
     "fp-ts": "2.11.5",

src/axios.ts

@@ -0,0 +1,12 @@
+import Axios from 'axios'
+import { USER_AGENT } from './constants'
+import Agent from 'agentkeepalive'
+
+export const axios = Axios.create({
+  httpAgent: new Agent(),
+  headers: {
+    'User-Agent': USER_AGENT,
+  },
+})
+
+export * from 'axios'

src/http-client.ts

@@ -1,7 +1,7 @@
-import axios, { Method, AxiosResponse } from 'axios'
+import { axios, Method, AxiosResponse } from './axios'
 import HttpStatus from 'http-status-codes'
 
-import { USER_AGENT, JSON_CONTENT_TYPE } from './constants'
+import { JSON_CONTENT_TYPE } from './constants'
 import { apiErrorFactory, NullError, InvalidProgramStateError } from './errors'
 import gunzip from './gunzip'
 import { inspect } from 'util'
@@ -30,7 +30,6 @@ export class HttpClient {
       'Content-Type': JSON_CONTENT_TYPE,
       Authorization: `Bearer ${this.auth.accessToken}`,
       'Amazon-Advertising-API-ClientId': this.auth.clientId,
-      'User-Agent': USER_AGENT,
     }
 
     if (this.auth.scope) {
@@ -193,9 +192,6 @@ export class HttpClient {
 
     const download = await axios.get<ArrayBuffer>(location, {
       responseType: 'arraybuffer',
-      headers: {
-        'User-Agent': USER_AGENT,
-      },
     })
 
     if (download.status !== this.httpStatus.OK) {

src/o-auth-client.ts

@@ -1,10 +1,10 @@
 import ClientOAuth2 from 'client-oauth2'
 import { Options } from 'client-oauth2'
-import axios, { Method } from 'axios'
 import { defaultsDeep } from 'lodash'
 import { USER_AGENT } from './constants'
 import { Marketplace } from './maketplace'
 import type { Headers } from './http-client'
+import { axios, Method } from './axios'
 
 const request: ClientOAuth2.Request = async (
   method,