--- a/get_feature_info.py	Fri Mar 24 11:57:48 2017 -0400
+++ b/get_feature_info.py	Fri Apr 13 09:43:51 2018 -0400
@@ -4,6 +4,7 @@
 
 import json
 import optparse
+from itertools import islice
 
 import requests
 from six.moves.urllib.parse import urljoin
@@ -31,13 +32,27 @@
 
 headers = {'Content-Type': 'application/json', 'Accept': 'application/json'}
 params = dict((k, getattr(options, k)) for k in ['format', 'expand'])
+
+first = True
+
+print('{')
+
 with open(options.input) as f:
-    ids = [line.strip() for line in f]
-data = {'ids': ids}
-r = requests.post(urljoin(server, ext), params=params, headers=headers,
-                  data=json.dumps(data))
+    while True:
+        ids = [line.strip() for line in islice(f, 50)]
+        if not ids:
+            break
+        if not first:
+            print(",")
+        data = {'ids': ids}
+        r = requests.post(urljoin(server, ext), params=params, headers=headers,
+                          data=json.dumps(data))
 
-if not r.ok:
-    r.raise_for_status()
+        if not r.ok:
+            r.raise_for_status()
 
-print(r.text)
+        print(r.text[1:-1])
+
+        first = False
+
+print('}')