wpt reports no max-age and expire headers when they exist

Hi,

I’m testing a website behind Akamai, downstream cacheability for static objects is explicitly set to a fixed value of 7 days (the same as the edge TTL), I can see the cache-control: max-age and expires headers correctly being set but wpt reports they are missing, for example:

FAILED - (No max-age or expires) - https://www.gef.com.co/wcsstore/DefaultStorefrontAssetStore8/images/colors/Gef/favicon.ico

But if you look at that URL you can see that a) it is being cached on the CDN, and b) both cache-control: max-age and expires headers are present with correct values:

accept-ranges: bytes cache-control: max-age=604800 content-encoding: gzip content-length: 83 content-type: image/x-icon date: Wed, 29 Apr 2020 22:09:03 GMT etag: "1000000009c22-13e-593c5e768bd7c" expires: Wed, 06 May 2020 22:09:03 GMT last-modified: Mon, 30 Sep 2019 14:18:03 GMT status: 200 vary: Accept-Encoding x-akamai-staging: ESSL x-cache: TCP_HIT from a23-50-49-28.deploy.akamaitechnologies.com

So I don’t understand why wpt report those headers as missing from the request. This is the full test result:

https://webpagetest.org/result/200429_0Z_236b5b47d99ca3acf1c0ced6ddc8c154/

NOTE: This test is against the CDN staging network, so if someone wants to test from their browser please check the test script for the IP address to be used.

Thanks in advance.

Hello,

I think I have the same problem for this url, WTP doesn’t find a max-age or expires header:

FAILED - (No max-age or expires) - https://www.example.com/uploads/s/cms_image/001/576/158/1576158088_5df24388a9d31-thumb.svg

While on the detail page you can see those headers…

Request 22: https://ww.example.com/uploads/s/cms_image/001/576/158/1576158088_5df24388a9d31-thumb.svg
Response Headers:

status: 200
set-cookie: __cfduid=da8d102f34c8cbf8c095db07cc4c740d11591793743; expires=Fri, 10-Jul-20 12:55:43 GMT; path=/; domain=.cdn.galaxy.tf; HttpOnly; SameSite=Lax; Secure
cf-cache-status: HIT
expires: Sat, 20 Mar 2021 10:42:06 GMT
vary: Accept-Encoding
last-modified: Thu, 12 Dec 2019 13:40:43 GMT
date: Wed, 10 Jun 2020 12:55:43 GMT
cf-ray: 5a133f8f2f220746-FRA
expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
content-encoding: br
age: 7092817
strict-transport-security: max-age=15768000
cf-request-id: 033fe60d7c00000746da9ee200000001
server: cloudflare
etag: W/"28f1-59981e44ed59b"
cache-control: max-age=604800
content-type: image/svg+xml
:status: 200

Report’s links:
[list]
[]https://www.webpagetest.org/result/200610_VT_d0194cda03322646e650c6027383f418/1/details/#step1_request22
[
]https://www.webpagetest.org/performance_optimization.php?test=200610_VT_d0194cda03322646e650c6027383f418&run=1#cache_static_content
[/list]

Any idea ? false positive ?

Thanks

Hi,

I had not noticed that the explanation is right there at the end of the Performance Review page in the Glossary: