Google Search redirect error started last week (no change to my site)

Hi @luke,

FWIW, I’ve managed to reproduce it a couple of times using the ‘User-Agent Switcher and Manager’ Firefox extension (sent the HAR to you via email, also uploaded here: phonolyth.com_Archive [21-05-19 20-10-04].har).
My further attempts at this failed (or succeed, meaning I got HTTP 200 every time), but Google Search Console still reported redirect error…
Until I switched to incognito mode, where I’m now getting infinite 301s all the time.

Normal request & response:

GET / HTTP/2
Host: phonolyth.com
User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: paddlejs_checkout_variant={"inTest":true,"controlGroup":false,"isForced":false,"variant":"multipage-radio-payment"}
Upgrade-Insecure-Requests: 1
Pragma: no-cache
Cache-Control: no-cache
TE: Trailers


HTTP/2 200 OK
cache-control: public, max-age=0, must-revalidate
content-type: text/html; charset=UTF-8
date: Wed, 19 May 2021 13:27:42 GMT
etag: "ec3640e13c4b7fb249af67190553065c-ssl-df"
strict-transport-security: max-age=31536000
vary: Accept-Encoding
server: Netlify
content-encoding: br
x-nf-request-id: 220340c2-f9f5-4cc6-a3b5-c161224d1ee7
age: 7234
content-length: 6407
X-Firefox-Spdy: h2

Incognito request & response:

GET / HTTP/2
Host: phonolyth.com
User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
DNT: 1
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Pragma: no-cache
Cache-Control: no-cache
TE: Trailers


HTTP/2 301 Moved Permanently
cache-control: public, max-age=0, must-revalidate
content-length: 38
content-type: text/plain
date: Wed, 19 May 2021 15:25:41 GMT
x-nf-request-id: f4d36d93-9c14-4d07-bb4f-89bf80732141
location: https://phonolyth.com/
server: Netlify
age: 370
X-Firefox-Spdy: h2

(The only difference I see between requests is DNT vs Cookie header)

So I think @vslavik is onto something…

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