Version 2.0

classes/headers.js

@@ -0,0 +1,33 @@
+class Headers {
+  constructor(rawHeaders) {
+    this.rawHeaders = rawHeaders;
+  }
+
+  entries() {
+    return Object.entries(this.rawHeaders)
+      .sort((e1, e2) => e1[0].localeCompare(e2[0]))
+      .map(([key, val]) => [key, val[0]]);
+  }
+
+  keys() {
+    return this.entries().map((e) => e[0]);
+  }
+
+  values() {
+    return this.entries().map((e) => e[1]);
+  }
+
+  get(name) {
+    return (this.rawHeaders[name.toLowerCase()] || [])[0] || null;
+  }
+
+  has(name) {
+    return !!this.get(name);
+  }
+
+  raw() {
+    return this.rawHeaders;
+  }
+}
+
+module.exports = Headers;