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You're seeing a blank page saying "HTTP_ERROR 431"? And you're running a Node.js HTTP server, like express or fastify? Running node --help states: ... --max-http-header-size=... set the maximum size of HTTP headers (default: 8KB) ... This Node.js CLI flag can help: --max-http-header-size=16384 It sets the HTTP Max Headers Size to 16KB. This is due to a "recent" (November 2018) change in Node.js. Namely a fix for a discovered vulnerability "Denial of Service with large HT...