Housekeeping Updates

README.md

@@ -32,7 +32,7 @@ Now do the following from a terminal command-line session:
 
     $ git clone https://github.com/ampproject/ampbench.git
     $ cd ampbench
-    $ npm update
+    $ npm install
     $ nodemon
     # or:
     $ npm start

amp-story/linter/caches.json

@@ -15,6 +15,14 @@
       "cacheDomain": "cdn.cloudflare.com",
       "updateCacheApiDomainSuffix": "amp.cloudflare.com",
       "thirdPartyFrameDomainSuffix": "cloudflareamp.net"
+    },
+    {
+      "id": "bing",
+      "name": "Bing AMP Cache",
+      "docs": "https://www.bing.com/webmaster/help/bing-amp-cache-bc1c884c",
+      "cacheDomain": "bing-amp.com",
+      "updateCacheApiDomainSuffix": "bing-amp.com",
+      "thirdPartyFrameDomainSuffix": "bing-amp.net"
     }
   ]
 }

ampbench_lib.js

@@ -1497,6 +1497,10 @@ function check_google_amp_cache(url, callback) {
     });
 }
 
+/* Note that this check may produce different results on different machines; in
+some cases google.com sends an ~10k header, which causes node to blow up with an
+HPE_HEADER_OVERFLOW error, since the default max appears to be ~8k. See
+https://stackoverflow.com/a/35330480/11543. */
 function check_google_amp_viewer(url, callback) {
 
     const url_viewer = make_url_to_google_amp_viewer(url);