web_api: Fix caching of https.agent objects between requests

config/default.json

@@ -1,7 +1,7 @@
 {
   "serverUrl": "https://textsecure-service-staging.whispersystems.org",
   "cdnUrl": "https://cdn-staging.signal.org",
-  "contentProxyUrl": "contentproxy.signal.org",
+  "contentProxyUrl": "http://contentproxy.signal.org:443",
   "disableAutoUpdate": false,
   "openDevTools": false,
   "buildExpiration": 0,

js/modules/web_api.js

@@ -186,25 +186,27 @@ function _promiseAjax(providedUrl, options) {
         `${options.type} ${url}${options.unauthenticated ? ' (unauth)' : ''}`
       );
     }
+
     const timeout =
       typeof options.timeout !== 'undefined' ? options.timeout : 10000;
 
     const { proxyUrl } = options;
     const agentType = options.unauthenticated ? 'unauth' : 'auth';
+    const cacheKey = `${proxyUrl}-${agentType}`;
 
-    const { timestamp } = agents[agentType] || {};
+    const { timestamp } = agents[cacheKey] || {};
     if (!timestamp || timestamp + FIVE_MINUTES < Date.now()) {
       if (timestamp) {
-        log.info(`Cycling agent for type ${agentType}`);
+        log.info(`Cycling agent for type ${cacheKey}`);
       }
-      agents[agentType] = {
+      agents[cacheKey] = {
         agent: proxyUrl
           ? new ProxyAgent(proxyUrl)
           : new Agent({ keepAlive: true }),
         timestamp: Date.now(),
       };
     }
-    const { agent } = agents[agentType];
+    const { agent } = agents[cacheKey];
 
     const fetchOptions = {
       method: options.type,