Frequent request delays and HTTP 500 errors on JSR webpages #1232
Description
When browsing to JSR from external pages, a new tab, or when reloading a page (example: https://jsr.io/@zod/zod), the webpage frequently takes a very long time to load, or errors with a HTTP 500, or both.
Example of a failed request
Response headers of a failed request
HTTP/2 500
content-type: text/html; charset=utf-8
link: </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/fresh-runtime.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/HeaderLogo.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/GlobalSearch.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/DarkModeToggle.js>; rel="modulepreload"; as="script"
x-deno-ray: 252d497aaa1f07c8c9b9ace4810be5a2
vary: Accept-Encoding
content-encoding: br
x-cloud-trace-context: 252d497aaa1f07c8c9b9ace4810be5a2
date: Sun, 30 Nov 2025 20:43:18 GMT
server: Google Frontend
content-length: 2864
via: 1.1 google
x-jsr-cache-status: miss
x-jsr-cache-id: DHR
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
X-Firefox-Spdy: h2
Request timings of a failed request
Example of a successful request, but the initial request took 7 seconds
Response headers of a slow request
HTTP/2 200
content-type: text/html; charset=utf-8
link: </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/fresh-runtime.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/HeaderLogo.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/GlobalSearch.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/DarkModeToggle.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/DownloadWidget.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/TicketModal.js>; rel="modulepreload"; as="script", </_fresh/js/ab949435518a8319c08a14b7d9d8b377b18b71c5/LocalSymbolSearch.js>; rel="modulepreload"; as="script"
x-deno-ray: e0d7c03014c131f6234ed7ad909ce207
vary: Accept-Encoding
content-encoding: br
x-cloud-trace-context: e0d7c03014c131f6234ed7ad909ce207
date: Sun, 30 Nov 2025 20:38:25 GMT
server: Google Frontend
content-length: 20268
via: 1.1 google
x-jsr-cache-status: miss
x-jsr-cache-id: DHR
alt-svc: h3=":443"; ma=2592000,h3-29=":443"; ma=2592000
X-Firefox-Spdy: h2
Request timings of a slow request
Collected x-deno-ray identifiers for HTTP 500 errors, all from the same URL -> https://jsr.io/@zod/zod:
00f93cbe07a991c02d5a08420f7c6c15d176e5df67e091d2f45989e89774b4e69068cf26086d1b153a690ef6bf1937d0252d497aaa1f07c8c9b9ace4810be5a2