Bug 253689

Currently, https://www.instagram.com/jumpei.mitsui/ replied 429 (Too Many Requests) responce with content-length:0.
In this case, Windows MiniBrowser just shows a blank page.

$ curl -D - https://www.instagram.com/jumpei.mitsui/
HTTP/2 429 
reporting-endpoints: coep_report="https://www.facebook.com/browser_reporting/?minimize=0"
report-to: {"max_age":86400,"endpoints":[{"url":"https:\/\/www.facebook.com\/browser_reporting\/?minimize=0"}],"group":"coep_report"}
document-policy: force-load-at-top
cross-origin-resource-policy: rollout
cross-origin-embedder-policy-report-only: require-corp;report-to="coep_report"
cross-origin-opener-policy: same-origin-allow-popups
pragma: no-cache
cache-control: private, no-cache, no-store, must-revalidate
expires: Sat, 01 Jan 2000 00:00:00 GMT
x-content-type-options: nosniff
x-xss-protection: 0
x-frame-options: DENY
strict-transport-security: max-age=15552000
content-type: text/html; charset="utf-8"
x-fb-debug: LzOG9hHoUvJeQXvpQyck26YRiEAXvV0XaW34cq1ebPZw/MLfze8UzZW8VSX73k2rw3dEAq5LVhKQZNZDIeHp6Q==
content-length: 0
date: Fri, 10 Mar 2023 04:40:09 GMT
priority: u=3,i
x-fb-trip-id: 1679558926
alt-svc: h3=":443"; ma=86400