[Resource-Timing] content-length/encodedBodySize (#27955)
Added tests for different scenarios of `Content-Length`
header and how it affects `encodedBodySize`.
Closes https://github.com/web-platform-tests/wpt/issues/27952
diff --git a/resource-timing/resource_timing_content_length.html b/resource-timing/resource_timing_content_length.html
new file mode 100644
index 0000000..32bd8a9
--- /dev/null
+++ b/resource-timing/resource_timing_content_length.html
@@ -0,0 +1,35 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+<meta charset="utf-8" />
+<title>This test validates the value of encodedBodySize in certain situations.</title>
+<link rel="help" href="http://www.w3.org/TR/resource-timing/#performanceresourcetiming"/>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+ function test_resource_timing_for_content_length({actualContentLength, lengthHeader}, title) {
+ promise_test(async t => {
+ const content = new Array(actualContentLength).fill('x').join('')
+ const url = `resources/resource-timing-content-length.py?content=${content}&length=${lengthHeader}`
+ fetch(url)
+ const entry = await new Promise(resolve => new PerformanceObserver((entryList, observer) => {
+ observer.disconnect()
+ resolve(entryList.getEntries()[0])
+ }).observe({entryTypes: ['resource']}))
+
+ const expectedContentLength = Number.isInteger(lengthHeader) ? Math.min(actualContentLength, lengthHeader) : actualContentLength
+ assert_equals(entry.encodedBodySize, expectedContentLength)
+ }, title);
+ }
+
+ test_resource_timing_for_content_length({actualContentLength: 3, lengthHeader: 'auto'},
+ "encodedBodySize should be equal to the actual byte size of the content")
+ test_resource_timing_for_content_length({actualContentLength: 13, lengthHeader: 'none'},
+ "encodedBodySize should be equal to the actual byte size of the content when no header present")
+ test_resource_timing_for_content_length({actualContentLength: 7, lengthHeader: 3},
+ "encodedBodySize should be equal to the actual byte size of the content when header value is lower than actual content")
+ test_resource_timing_for_content_length({actualContentLength: 8, lengthHeader: 40},
+ "encodedBodySize should be equal to the actual byte size of the content when header value is higher than actual content")
+</script>
+</html>
diff --git a/resource-timing/resources/resource-timing-content-length.py b/resource-timing/resources/resource-timing-content-length.py
new file mode 100644
index 0000000..6dbce04
--- /dev/null
+++ b/resource-timing/resources/resource-timing-content-length.py
@@ -0,0 +1,19 @@
+def main(request, response):
+ content = request.GET.first(b"content")
+ length = request.GET.first(b"length").decode("ascii")
+ response.add_required_headers = False
+
+ output = b"HTTP/1.1 200 OK\r\n"
+ output += b"Content-Type: text/plain;charset=UTF-8\r\n"
+ if length == b"auto" :
+ output += b"Content-Length:"
+ output += "{0}".format(len(content)).encode("ascii")
+ output += b"\r\n"
+ elif length != b"none" :
+ output += b"Content-Length:"
+ output += "{0}".format(length).encode("ascii")
+ output += b"\r\n"
+ output += b"\r\n"
+ output += content
+ response.writer.write(output)
+ response.close_connection = True
