Limits.md

Limitation of URL and headers size

Modern browsers allow you specify very long URLs, 2MB easily.

But there are some limitation from WebServers and CDN. Generally up to 12KB only for URI is safe.

Limitations

URL address is part of request HTTP headers, following limits are for URL + headers.

Vercel 14KB, hard limit

Docs

Apache httpd 8KB, can be increased

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Nginx 8KB, can be increased

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NodeJS 8KB, can be increased with --max-http-header-size=16384

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