first implementation

frontend/node_modules/axios/lib/helpers/parseHeaders.js

@@ -0,0 +1,69 @@
+'use strict';
+
+import utils from '../utils.js';
+
+// RawAxiosHeaders whose duplicates are ignored by node
+// c.f. https://nodejs.org/api/http.html#http_message_headers
+const ignoreDuplicateOf = utils.toObjectSet([
+  'age',
+  'authorization',
+  'content-length',
+  'content-type',
+  'etag',
+  'expires',
+  'from',
+  'host',
+  'if-modified-since',
+  'if-unmodified-since',
+  'last-modified',
+  'location',
+  'max-forwards',
+  'proxy-authorization',
+  'referer',
+  'retry-after',
+  'user-agent',
+]);
+
+/**
+ * Parse headers into an object
+ *
+ * ```
+ * Date: Wed, 27 Aug 2014 08:58:49 GMT
+ * Content-Type: application/json
+ * Connection: keep-alive
+ * Transfer-Encoding: chunked
+ * ```
+ *
+ * @param {String} rawHeaders Headers needing to be parsed
+ *
+ * @returns {Object} Headers parsed into an object
+ */
+export default (rawHeaders) => {
+  const parsed = {};
+  let key;
+  let val;
+  let i;
+
+  rawHeaders &&
+    rawHeaders.split('\n').forEach(function parser(line) {
+      i = line.indexOf(':');
+      key = line.substring(0, i).trim().toLowerCase();
+      val = line.substring(i + 1).trim();
+
+      if (!key || (parsed[key] && ignoreDuplicateOf[key])) {
+        return;
+      }
+
+      if (key === 'set-cookie') {
+        if (parsed[key]) {
+          parsed[key].push(val);
+        } else {
+          parsed[key] = [val];
+        }
+      } else {
+        parsed[key] = parsed[key] ? parsed[key] + ', ' + val : val;
+      }
+    });
+
+  return parsed;
+};