WebPerf Cloudflare PageSpeed Automatic Signed Exchanges (SXGs) - Signed Exchanges & Google Search Cache

adamus007p · Oct 4, 2022

Hello @eva2000 I have followed your post Testing Page Speed With Cloudflare Automatic Signed Exchanges & Google Search Cache - Centmin Mod Blog

unfortunately it do not works.

I add CAA, change cache time from respect existing headers to 2min. Domain is in orange. AMP is disabled. Automatic Signed Exchanges (SXGs) is enabled.
SSL/TLS encryption mode is Full.

I have received an email:

Hello,

Cloudflare has observed issuance of the following certificate for domain.com or one of its subdomains:

Log date: 2022-10-03 14:02:18 UTC
Issuer: CN=GTS CA 2A1,O=Google Trust Services LLC,C=US
Validity: 2022-10-03 13:02:16 UTC - 2022-11-17 13:02:15 UTC
DNS Names: *.domain.com, domain.com
Click to expand...

but in google search console still I see
Code (Text):
Content-Encoding: br
I was trying to install the tooll to inspect it in CMD:
Code (Text):
# install latest Go version for Centmin Mod LEMP stack systems
/usr/local/src/centminmod/addons/golang.sh install

# disable Centmin Mod default ccache compiler caching
export CC='gcc'

# install dump-signedexchange
go install github.com/WICG/webpackage/go/signedexchange/cmd/dump-signedexchange@latest
but I have error:
Code (Text):
golang Version: -n
/usr/local/src/centminmod/addons/golang.sh: line 190: go: command not found
---------------------------
[14:18][root@ho.com ~]# export CC='gcc'
[14:19][root@ho.com ~]# go install github.com/WICG/webpackage/go/signedexchange/cmd/dump-signedexchange@latest
-bash: /usr/bin/go: No such file or directory
May you advise what I am doing wrong?

PS.
My response from google consol
Code (Text):
HTTP/1.1 200 OK
Date: Mon, 03 Oct 2022 14:44:56 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
CF-Ray: 75xxxxxx206-IAD
Cache-Control: no-store, no-cache, must-revalidate
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Set-Cookie: PHPSESSID=ik6xxxxxxxxxxxxxcll; path=/; Secure; HttpOnly; SameSite=lax
Strict-Transport-Security: max-age=31536000; preload
Vary: Accept-Encoding
CF-Cache-Status: DYNAMIC
pragma: no-cache
Set-Cookie: Domain-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx25; path=/; domain=www.Domain.com; Secure; HttpOnly; SameSite=lax
Set-Cookie: Domain-3xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx3; path=/; domain=www.Domain.com; Secure; HttpOnly; SameSite=lax
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-powered-by: centminmod
x-xss-protection: 1; mode=block
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=6im5xxxxxxnPlJ4F9V"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
Server: cloudflare
Content-Encoding: br
Is is correct?

esspecially:
Code (Text):
Expires: Thu, 19 Nov 1981 08:52:00 GMT

eva2000 · Oct 4, 2022

adamus007p said: ↑

I was trying to install the tooll to inspect it in CMD:

but I have error:
Click to expand...

What version of Centmin Mod are you using output for command below?
Code (Text):
cminfo versions
For folks reading this message and yourself for posting code or output from commands to keep the formatting, you might want to use CODE tags for code How to use forum BBCODE code tags

adamus007p said: ↑

unfortunately it do not works.

I add CAA, change cache time from respect existing headers to 2min. Domain is in orange. AMP is disabled. Automatic Signed Exchanges (SXGs) is enabled.
Click to expand...

what doesn't work?

Unfortunately Cloudflare Automatic Signed Exchanges has a lot of limitations which aren't beneficial in it's current state. I mentioned them in this guide too https://community.cloudflare.com/t/improving-time-to-first-byte-ttfb-with-cloudflare/390367/1

There’s also Cloudflare’s Automatic Signed Exchanges https://blog.cloudflare.com/automatic-signed-exchanges/ 4. In theory it’s meant to improve Largest Content Full paint by improving TTFB. But in it’s current state of implementation it has limited benefits due to it only being for Android mobile devices right now and not all Google search result listings getting SXG cache/prefetch being triggered. Google feature snippet listings on Google search also do not get SXG cache/browser prefetch support right now. Only like top 1 or 2 search results listed on Google search would benefit and SXG cached version is slower for pages which don’t get Google Chrome Android browser’s SXG cache prefetch (pages not listed or ranked in top position). I wrote a detailed blog about Cloudflare SXG caching and Android Chrome cache prefetch - including benchmarks at Testing Page Speed With Cloudflare Automatic Signed Exchanges & Google Search Cache - Centmin Mod Blog 4

Click to expand...

So unless your site is ranked #1 or #2 in every search term on Google in mobile Android searches, you won't get the benefit of Google prefeteched caching of SXG cached versions.

adamus007p · Oct 4, 2022

Code (Text):

cminfo versions

1st:
123.09beta01.b505 #Mon May  4 23:31:01 CEST 2020
..
last 10:
124.00stable.s40 #Tue Jul  5 14:21:47 UTC 2022
124.00stable.s40 #Tue Jul  5 14:26:18 UTC 2022
124.00stable.s40 #Tue Jul  5 14:28:07 UTC 2022
124.00stable.s40 #Tue Jul  5 14:30:12 UTC 2022
124.00stable.s40 #Tue Jul  5 14:30:40 UTC 2022
124.00stable.s40 #Tue Jul  5 14:41:54 UTC 2022
124.00stable.s51 #Fri Sep 30 12:19:38 UTC 2022
124.00stable.s51 #Fri Sep 30 12:28:18 UTC 2022
124.00stable.s51 #Fri Sep 30 12:33:56 UTC 2022
124.00stable.s51 #Fri Sep 30 12:34:24 UTC 2022

Code (Text):

curl -I https://domain.com
HTTP/1.1 301 Moved Permanently
Date: Mon, 03 Oct 2022 16:04:30 GMT
Content-Type: text/html
Connection: keep-alive
location: https://www.domain.com/
x-powered-by: centminmod
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
x-content-type-options: nosniff
CF-Cache-Status: DYNAMIC
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=xxxx"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
Strict-Transport-Security: max-age=31536000; preload
Server: cloudflare
CF-RAY: 7546e9faebad910d-FRA

Code (Text):

curl -I https://www.domain.com
HTTP/1.1 200 OK
Date: Mon, 03 Oct 2022 16:05:20 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
vary: Accept-Encoding
expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
pragma: no-cache
set-cookie: domain-31e2xxxx; expires=Sun, 23-Oct-2022 16:05:19 GMT; Max-Age=1727999; path=/; domain=www.domain.com; secure; HttpOnly; SameSite=Lax
set-cookie: domain-xx; expires=Sun, 23-Oct-2022 16:05:19 GMT; Max-Age=1727999; path=/; domain=www.domain.com; secure; HttpOnly; SameSite=Lax
x-powered-by: centminmod
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
x-content-type-options: nosniff
CF-Cache-Status: DYNAMIC
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=xx"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
Strict-Transport-Security: max-age=31536000; preload
Server: cloudflare
CF-RAY: 7546eb2fb8879b7c-FRA

Code (Text):

curl -I http://domain.com
HTTP/1.1 301 Moved Permanently
Date: Mon, 03 Oct 2022 16:06:07 GMT
Connection: keep-alive
Cache-Control: max-age=3600
Expires: Mon, 03 Oct 2022 17:06:07 GMT
Location: https://domain.com/
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=xx"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
X-Content-Type-Options: nosniff
Server: cloudflare
CF-RAY: 7546ec57fd0f916e-FRA

Code (Text):

curl -I http://www.domain.com
HTTP/1.1 301 Moved Permanently
Date: Mon, 03 Oct 2022 16:06:43 GMT
Connection: keep-alive
Cache-Control: max-age=3600
Expires: Mon, 03 Oct 2022 17:06:43 GMT
Location: https://www.domain.com/
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=xx"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
X-Content-Type-Options: nosniff
Server: cloudflare
CF-RAY: 7546ed37be7290ec-FRA

why there is

Code (Text):

expires: Thu, 19 Nov 1981 08:52:00 GMT

eva2000 · Oct 4, 2022

seems https://www.domain.com is your main primary domain and it has Cache-Control: no-store, no-cache, must-revalidate which tells browser and Google to not cache the page
Code (Text):
curl -I https://www.domain.com
HTTP/1.1 200 OK
Date: Mon, 03 Oct 2022 16:05:20 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
vary: Accept-Encoding
expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate

adamus007p · Oct 4, 2022

@eva2000 How and where I can correct it?

Do I need to correct it in sever side or in Cloudflare?
May you advise how to change it?

I googled but did not find any answer.

My Cloudflare settings:
Code (Text):
In Cloudflare > Configuration
Caching level > Standard
Browser Cache TTL > Respect Existing Headers
Cache rules > none

eva2000 · Oct 4, 2022

Respect Existing Headers = use origin server headers which isn't what you want.

adamus007p · Oct 4, 2022

What is recommended (nowadays) Browser Cache TTL ?
I have changed it to 1month.

Code (Text):

curl -I https://www.domain.com
HTTP/1.1 200 OK
Date: Mon, 03 Oct 2022 16:39:38 GMT
Content-Type: text/html; charset=utf-8
Connection: keep-alive
vary: Accept-Encoding
expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
pragma: no-cache
set-cookie: domain-xx; expires=Sun, 23-Oct-2022 16:39:38 GMT; Max-Age=1728000; path=/; domain=www.domain.com; secure; HttpOnly; SameSite=Lax
set-cookie: domain-xx; expires=Sun, 23-Oct-2022 16:39:38 GMT; Max-Age=1728000; path=/; domain=www.domain.com; secure; HttpOnly; SameSite=Lax
x-powered-by: centminmod
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
x-content-type-options: nosniff
CF-Cache-Status: DYNAMIC
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=u%2BCxx3"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
Strict-Transport-Security: max-age=31536000; preload
Server: cloudflare
CF-RAY: 75471d736d339c0a-FRA

I see that there are two time set-cookie. Why?

Respond from Google search console:

Code (Text):

HTTP/1.1 200 OK
Date: Mon, 03 Oct 2022 16:42:05 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
CF-Ray: 754721002a865c8e-IAD
Cache-Control: no-store, no-cache, must-revalidate
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Set-Cookie: PHPSESSID=1u672s52ecj4fe4vb8to9m40ik; path=/; Secure; HttpOnly; SameSite=lax
Strict-Transport-Security: max-age=31536000; preload
Vary: Accept-Encoding
CF-Cache-Status: DYNAMIC
pragma: no-cache
Set-Cookie: domain-xx; path=/; domain=www.domain.com; Secure; HttpOnly; SameSite=lax
Set-Cookie: domain-xx; path=/; domain=www.domain.com; Secure; HttpOnly; SameSite=lax
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-powered-by: centminmod
x-xss-protection: 1; mode=block
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=xx"}],"group":"cf-nel","max_age":604800}
NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
Server: cloudflare
Content-Encoding: br

Which version of centminmode do I have?
the beta?

I was using the https://community.centminmod.com/threads/centmin-mod-124-00stable-130-00beta01-releases.22673/ to switch to stable version.

eva2000 · Oct 4, 2022

adamus007p said: ↑

What is recommended (nowadays) Browser Cache TTL ?
I have changed it to 1month.
Click to expand...

entirely dependent on your web app and desired cache duration

adamus007p said: ↑

I see that there are two time set-cookie. Why?
Click to expand...

that would be your web app related

adamus007p · Oct 4, 2022

Thank you for your answers.
What is recommendations for Wordpress or for Ecommerces?

Which version of centminmode do I have?
the beta?
Code (Text):
cminfo versions

1st:
123.09beta01.b505 #Mon May  4 23:31:01 CEST 2020
..
last 10:
124.00stable.s40 #Tue Jul  5 14:21:47 UTC 2022
124.00stable.s40 #Tue Jul  5 14:26:18 UTC 2022
124.00stable.s40 #Tue Jul  5 14:28:07 UTC 2022
124.00stable.s40 #Tue Jul  5 14:30:12 UTC 2022
124.00stable.s40 #Tue Jul  5 14:30:40 UTC 2022
124.00stable.s40 #Tue Jul  5 14:41:54 UTC 2022
124.00stable.s51 #Fri Sep 30 12:19:38 UTC 2022
124.00stable.s51 #Fri Sep 30 12:28:18 UTC 2022
124.00stable.s51 #Fri Sep 30 12:33:56 UTC 2022
124.00stable.s51 #Fri Sep 30 12:34:24 UTC 2022
Ok I see the last one

I was using the https://community.centminmod.com/threads/centmin-mod-124-00stable-130-00beta01-releases.22673/ to switch to stable version.

@eva2000 any idea why Automatic Signed Exchanges (SXGs) is not working?

adamus007p · Oct 4, 2022

Hello, I have update cmupdate and reinstall everything and not it seems ok, but I have a following error:

Code (Text):

2022/10/04 09:19:46 signedexchange: unknown magic bytes: [60 72 84 77 76 62 60 72]
curl -sH 'Accept: application/signed-exchange;v=b3' https://domain.com/ | dump-signedexchange -payload=false
2022/10/04 09:24:32 signedexchange: unknown magic bytes: [60 104 116 109 108 62 10 60]

When I used

Code (Text):

dump-signedexchange -requestHeader 'amp-cache-transform: google' -uri https://domain.com/url -verify -payload=false


2022/10/04 09:27:49 GET "https://domain.com/url" responded with unexpected content type "text/html; charset=utf-8"

eva2000 · Oct 5, 2022

adamus007p said: ↑

but I have a following error:
Click to expand...

seems latest versions of dump-signedexchange don't require curl and can run themselves. Unknown magic bytes error with curl is same as dump-signedexchange native error message for responded with unexpected content type "text/html; charset=UTF-8

dump-signedexchange: command not found · Issue #441 · WICG/webpackage

Adds support for URI input to dump-signedexchange by EverlastingBugstopper · Pull Request #429 · WICG/webpackage

Provide error message for unexpected mime type by EverlastingBugstopper · Pull Request #453 · WICG/webpackage
Code (Text):
dump-signedexchange -requestHeader 'Accept: application/signed-exchange;v=b3' -uri https://domain.com/ -verify -payload=false
2022/10/04 16:55:44 GET "https://domain.com/" responded with unexpected content type "text/html; charset=UTF-8"
However, the easiest way to confirm if SXG is working itself (separate from Google prefetch search SXG cache), is to inspect Google Search Console's response headers as outlined at Testing Page Speed With Cloudflare Automatic Signed Exchanges & Google Search Cache - Centmin Mod Blog

Once Cloudflare Automatic Signed Exchanges (SXGs) is enabled and provided your web site meets all the below outlined requirements for SXG caching/usage, you should be able to check if it’s working by doing the same Chrome (or supported browser) tests or simply by using Google Search Console and do a Mobile Usability Live URL Inspection of a URL link on your site and inspect the MORE INFO -> HTTP Response (screenshot below) to check if content-encoding: mi-sha256-03 is displayed.
Click to expand...

adamus007p said: ↑

Ecommerces?
Click to expand...

Not really suited for Ecommerce as SXG requires extended caching and removes cookies which most Ecommerce sites would need to function https://developers.cloudflare.com/f...es/signed-exchanges/signed-exchanges-caveats/

Allowed request headers
Signed exchanges remove cookies and headers from HTTP requests, which can create problems with dynamic or personalized content. This is intentional since signed exchanges can be distributed to multiple browsers. Therefore, packaging any personalized or dynamic content into a signed exchange could be a security risk. The only request headers that are not removed are the following:

AMP-Cache-Transform

Accept

From

User-Agent

Accept

Via

CF-Connecting-IP

True-Client-IP

X-Forwarded-For

CF-RAY

CF-IPCountry

CF-Visitor

CF-Loop

CF-Worker

CF-Threat-Score

X-Bot-Score

X-Static-Bot

X-Threat-Score

X-Tlsclientauth

X-Verified-Bot

Click to expand...

Response headers
Since Cloudflare cannot be sure whether a signed exchange includes private information or not, a signed exchange will not be generated in the presence of the following response headers:

Authentication-Control

Authentication-Info

Clear-Site-Data

Optional-WWW-Authenticate

Proxy-Authenticate

Proxy-Authentication-Info

Public-Key-Pins

Sec-WebSocket-Accept

Set-Cookie

Set-Cookie2

SetProfile

Strict-Transport-Security

WWW-Authenticate

Signed exchanges will not be created if the response headers contain a cache-control header whose value is either:

private

no-store

no-cache

max-age=0

For example, cache-control=private would mean that a signed exchange is not created.

The cache-control response header can have one of the following names:

cache-control

cdn-cache-control

cloudflare-cdn-cache-control

surrogate-control

For example, cdn-cache-control=no-cache would mean that a signed exchange is not created.
Click to expand...

So for some sites like Ecommerce which have Set-Cookie, no-store, no-cache, private etc headers, SXG won't be enabled

With all that said, seems I tried SXG again and can't get it to work right now, so you'd want to contact Cloudflare support to ask/report. But in all honesty there are only very very limited gains in enabling Cloudflare SXG support right now so not worth the extra effort.

eva2000 · Oct 5, 2022

This quote still applies. However, it looks like Cloudflare Configuration Rule enablement of CF SXG on a per hostname basis doesn’t work which is what I used above to enable it for my blog. If I enable CF SXG via the Speed configuration tab for global domain zone CF SXG, it seems to work. So how did you enable Cloudflare Automatic Signed Exchanges? Via Speed configuration tab or via a Cloudflare Configuration Rule?

Code (Text):

dump-signedexchange -requestHeader 'Accept: application/signed-exchange;v=b3' -uri https://blog.centminmod.com/ -verify -payload=false
format version: 1b3
request:
  method: GET
  uri: https://blog.centminmod.com/
  headers:
response:
  status: 200
  headers:
    Digest: mi-sha256-03=WjDNkrP5retqyEjxp61BYTOfNqzwE71AmBkjaLaoTrI=
    Expires: Wed, 05 Oct 2022 17:37:10 GMT
    Report-To: {"group":"default","max_age":31536000,"endpoints":[{"url":"https://centminmodcom.report-uri.com/a/d/g"}],"include_subdomains":true}
    Origin-Trial: AsjOFW4CC0+8iw2G/r2Dh6BiD9m52TgR4edDLHzKMcCSwrfoJ86olaKTvmakDL+o42xrn54wVDLpNngjYOtwOQIAAABdeyJvcmlnaW4iOiJodHRwczovL2Jsb2cuY2VudG1pbm1vZC5jb206NDQzIiwiZmVhdHVyZSI6IlByaW9yaXR5SGludHNBUEkiLCJleHBpcnkiOjE2NDc5OTM1OTl9
    Last-Modified: Tue, 04 Oct 2022 17:21:36 GMT
    Cf-Cache-Status: HIT
    X-Ua-Compatible: IE=edge
    Vary: Accept-Encoding
    Cf-Cachetime: 2592000
    Content-Type: text/html; charset=UTF-8
    Cache-Control: public, max-age=86400, s-maxage=86400, stale-while-revalidate=60
    X-Frame-Options: SAMEORIGIN
    Age: 813
    Server: cloudflare
    Cf-Req-Country: CA
    Referrer-Policy: strict-origin-when-cross-origin
    Content-Encoding: mi-sha256-03
    Permissions-Policy: interest-cohort=(), accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()
    Cf-Ray: 754faf1980af4bc5-YUL
    Date: Tue, 04 Oct 2022 17:37:10 GMT
    X-Powered-By: centminmod
    Cf-Index-Rule: 1
    X-Xss-Protection: 1; mode=block
    X-Content-Type-Options: nosniff
    Nel: {"report_to":"default","max_age":31536000,"include_subdomains":true}
signature: sig;sig=*MEQCIB+h+keBbUBw0mLxWpWCk04RXB80XQZHmsUkTXh6UoVGAiBkU8qFn2OLvkMsxDhDMiDQ5/Sb4B+jIK2bBCeGlupo7A==*;integrity="digest/mi-sha256-03";cert-url="https://blog.centminmod.com/cdn-fpw/sxg/cert.pem.msg.xroh1qa53ywIys_xWfDAi_da2PcAO1lbiQwvs9cc5Kg";cert-sha256=*xroh1qa53ywIys/xWfDAi/da2PcAO1lbiQwvs9cc5Kg=*;validity-url="https://blog.centminmod.com/cdn-fpw/sxg/valid.msg.validity";date=1664901431;expires=1664991431
header integrity: sha256-gbgTVTIThuWu8+9DNAkbniXwwr7HwW/ZCSUYd8RRkgM=

The exchange has a valid signature.

or via curl passthrough

Code (Text):

curl -sH 'Accept: application/signed-exchange;v=b3' https://blog.centminmod.com/ | dump-signedexchange -payload=false
format version: 1b3
request:
  method: GET
  uri: https://blog.centminmod.com/
  headers:
response:
  status: 200
  headers:
    Date: Tue, 04 Oct 2022 17:43:30 GMT
    Expires: Wed, 05 Oct 2022 17:43:30 GMT
    Cf-Cachetime: 2592000
    X-Powered-By: centminmod
    Last-Modified: Tue, 04 Oct 2022 17:21:36 GMT
    X-Ua-Compatible: IE=edge
    X-Xss-Protection: 1; mode=block
    Permissions-Policy: interest-cohort=(), accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=()
    X-Content-Type-Options: nosniff
    Age: 1193
    Origin-Trial: AsjOFW4CC0+8iw2G/r2Dh6BiD9m52TgR4edDLHzKMcCSwrfoJ86olaKTvmakDL+o42xrn54wVDLpNngjYOtwOQIAAABdeyJvcmlnaW4iOiJodHRwczovL2Jsb2cuY2VudG1pbm1vZC5jb206NDQzIiwiZmVhdHVyZSI6IlByaW9yaXR5SGludHNBUEkiLCJleHBpcnkiOjE2NDc5OTM1OTl9
    Cf-Req-Country: CA
    Cf-Cache-Status: HIT
    Content-Encoding: mi-sha256-03
    Nel: {"report_to":"default","max_age":31536000,"include_subdomains":true}
    Cf-Ray: 754fb85ee5037150-YUL
    Digest: mi-sha256-03=WjDNkrP5retqyEjxp61BYTOfNqzwE71AmBkjaLaoTrI=
    Server: cloudflare
    Report-To: {"group":"default","max_age":31536000,"endpoints":[{"url":"https://centminmodcom.report-uri.com/a/d/g"}],"include_subdomains":true}
    Referrer-Policy: strict-origin-when-cross-origin
    X-Frame-Options: SAMEORIGIN
    Vary: Accept-Encoding
    Content-Type: text/html; charset=UTF-8
    Cache-Control: public, max-age=86400, s-maxage=86400, stale-while-revalidate=60
    Cf-Index-Rule: 1
signature: sig;sig=*MEQCIQCHTwU9qZQ0YLK2I+t7uohpna5GOMmnfdBME4J9w7NJmQIfdWb2IaIZhnDWZEkB+CXSqASvZ0RCb1HTTe6KvSsaFQ==*;integrity="digest/mi-sha256-03";cert-url="https://blog.centminmod.com/cdn-fpw/sxg/cert.pem.msg.xroh1qa53ywIys_xWfDAi_da2PcAO1lbiQwvs9cc5Kg";cert-sha256=*xroh1qa53ywIys/xWfDAi/da2PcAO1lbiQwvs9cc5Kg=*;validity-url="https://blog.centminmod.com/cdn-fpw/sxg/valid.msg.validity";date=1664901810;expires=1664991810
header integrity: sha256-lIL/EmRfUe7n5ik4bCLaSAzZL8P+LUhn6+bey3+kcDI=

adamus007p · Oct 5, 2022

@eva2000
Thank you for your time and respond.

I have enabled CF SXG via I have selected domain.com then I went to tab speed > optimization and then I have turn on Automatic Signed Exchanges (SXGs)

whem i type
Code (Text):
dump-signedexchange -requestHeader 'Accept: application/signed-exchange;v=b3' -uri https://blog.centminmod.com/ -verify -payload=false

2022/10/04 22:46:08 GET "https://blog.centminmod.com/" responded with unexpected content type "text/html; charset=UTF-8"
Code (Text):
curl -sH 'Accept: application/signed-exchange;v=b3' https://blog.centminmod.com/ | dump-signedexchange -payload=false
2022/10/04 22:47:43 signedexchange: unknown magic bytes: [60 33 68 79 67 84 89 80]
So for some sites like Ecommerce which have Set-Cookie, no-store, no-cache, private etc headers, SXG won't be enabled

So it is not recommected for ecommerce to use SXG?

eva2000 · Oct 5, 2022

adamus007p said: ↑

whem i type
Click to expand...

I disabled SXG again on the blog as non-Google prefetch cached SXG is slower than than SXG disabled if your site isn't ranking in to 2 results for each search term as you can see in my benchmarks at Testing Page Speed With Cloudflare Automatic Signed Exchanges & Google Search Cache - Centmin Mod Blog. Same slower TTFB for e-commerce sites if you enable SXG but don't get the Google prefetched cached SXG.

SXG only beneficially if you have many search terms ranked in top 1 or 2 search results for many of your site's pages. Only then do you get Google prefetched cached SXG - which is what improves TTFB and thus LCP.

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