Fetch: Response's trailer

See whatwg/fetch#473 for context.
web-platform-tests · Feb 13, 2017 · 763c1f5 · 763c1f5
1 parent b4ba266
commit 763c1f5
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diff --git a/fetch/api/response/response-idl.html b/fetch/api/response/response-idl.html
@@ -41,6 +41,7 @@
         readonly attribute boolean ok;
         readonly attribute ByteString statusText;
         [SameObject] readonly attribute Headers headers;
+        readonly attribute Promise<Headers> trailer;
 
         [NewObject] Response clone();
       };

diff --git a/fetch/api/response/response-trailer.html b/fetch/api/response/response-trailer.html
@@ -0,0 +1,24 @@
+<!doctype html>
+<title>trailer() test</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<div id=log></div>
+<!-- based on /XMLHttpRequest/getresponseheader-chunked-trailer.htm -->
+<script>
+promise_test(() => {
+  return fetch("/XMLHttpRequest/resources/chunked.py").then(res => {
+    assert_equals(res.headers.get("Trailer"), "X-Test-Me")
+    assert_equals(res.headers.get("X-Test-Me"), null)
+    assert_equals(res.headers.get("Content-Type"), "text/plain")
+    return Promise.all([
+      res.text().then(text => {
+        assert_equals(text, "First chunk\r\nSecond chunk\r\nYet another (third) chunk\r\nYet another (fourth) chunk\r\n")
+      }),
+      res.trailer.then(trailers => {
+        assert_equals(trailers.get("X-Test-Me"), "Trailer header value")
+        assert_throws(new TypeError, trailers.append("Immutable-My-Ass", "Hi!"))
+      })
+    ])
+  })
+})
+</script>